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| 1 | Effect of Heat Treatment on Microstructure and Property of Cr13 Super Martensitic Stainless Steel显示文摘The microstructures and mechanical properties of Cr13 super martensitic stainless steel after different heat treatments were studied. The results show that the structures of the steel after quenching are of lath martensite mixed with a small amount of retained austenite. With the raising quenching temperature, the original austenite grain size increases and the lath martensite gradually becomes thicker. The structures of the tempered steel are mixtures of tempered martensite and reversed austenite dispersed in the martensite matrix. The amount of reversed austenite is from 7.54% to 22.49%. After different heat treatments, the tensile strength, the elongation and the HRC hardness of the steel are in the range of 813-1 070 MPa, 10.1%-21.2% and 21.33-32.37, respectively. The steel displays the best comprehensive mechanical properties after the sample is quenched at 1 050 ℃ followed by tempering at 650 ℃. | LIU Yu-rong YE Dong YONG Qi-long SU Jie ZHAO Kun-yu JIANG Wen | 2011 | Journal of Iron and Steel Research(International)2011，18，11： | 49 |
| 2 | Recovery of Iron From High-Iron Red Mud by Reduction Roasting With Adding Sodium Salt显示文摘Red mud is the waste generated during aluminum production from bauxite, containing lots of iron and other valuable metals. In order to recover iron from red mud, the technology of adding sodium carbonate-reduction roasting-magnetic separation to treat high-iron red mud was developed. The effects of sodium carbonate dosage, reduction temperature and reduction time on the qualities of final product and the phase transformations in reduction process were discussed in detail. The results showed that the final product (mass percent), assaying Fe of 90.87% and Al2O3 of 0.95% and metallization degree of 94.28% was obtained at an overall iron recovery of 95.76% under the following conditions of adding 8% sodium carbonate, reduction roasting at 1 050 ℃ for 80 min and finally magnetic separation of the reduced pellets by grinding up to 90% passing 0.074 mm at magnetic field intensity of 0.08 T. The XRD (X-ray diffraction) results indicated that the iron oxides were transformed into metallic iron. Most of aluminum mineral and silica mineral reacted with sodium carbonate during the reduction roasting and formed nonmagnetic materials. | ZHU De-qing, CHUN Tie-jun, PAN Jian, HE Zhen (School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China) | 2012 | Journal of Iron and Steel Research(International)2012，19，8： | 38 |
| 3 | Microstructures and Mechanical Properties of Fe-Mn-(Al, Si) TRIP/TWIP Steels显示文摘The mechanical properties and microstructure of two low carbon high manganese steels with 23.8% (No.1) and 33% (No.2) (mass percent) of manganese were investigated. The results showed that No.1 steel possesses high strength and high plasticity, and No.2 steel has a relatively high strength and extraordinary plasticity. The No.1 steel exhibits both TRIP (transformation induced plasticity) and TWIP (twin induced plasticity) effects during the deformation; while only TWIP effect appeared under the same deformation condition for No.2 steel. The comparison between the microstructures and mechanical properties of two steels was made, and the strengthening mechanisms were also analyzed. | DING Hua TANG Zheng-You LI Wei WANG Mei SONG Dan | 2006 | Journal of Iron and Steel Research(International)2006，13，6： | 31 |
| 4 | Study and Application of Heat Treat ment of Multi-Element Wear-Resistant Low-Alloy Steel显示文摘The effects of heat treatment on the properties of multi-element wear-resistant low-alloy steel (MLAWS) which is used to make the liner of rolling mill torus were researched. The results show that when quenching temperature is lower than 900 ℃, the hardness increases with the increase of temperature, and when quenching temperature is higher than 900 ℃, the hardness decreases with the increase of temperature. As quenching temperature is lower than 920 ℃, the effect of quenching temperature on the impact toughness is not obvious. When quenching temperature is higher than 920 ℃, impact toughness decreases with the increase of temperature. When tempering temperature is higher than 450 ℃, the hardness begins to decrease obviously. After tempering at 350 ℃, the best wear resistance was obtained. According to the service condition of rolling mill torus liner, the MLAWS is quenched from 900-920 ℃ and tempered at 350-370 ℃. | JIANG Zhi-qiang DU Jian-ming FENG Xi-lan | 2006 | Journal of Iron and Steel Research(International)2006，13，1： | 29 |
| 5 | Smith Prediction Monitor AGC System Based on Fuzzy Self-Tuning PID Control显示文摘In accordance with the feature of pure delay in monitor AGC system for cold rolling mill, a new fuzzy self-tuning PID Smith prediction controller is developed. The position control model is deduced based on a single stand cold rolling mill, and the fuzzy controller for monitor AGC system is designed. The analysis of dynamic performance for traditional PID Smith prediction controller and fuzzy self-tuning PID Smith prediction controller is done by MATLAB toolbox. The simulation results show that fuzzy self-tuning PID Smith controller has stronger robustness, faster response and higher static accuracy than traditional PID Smith controller. | SUN Jie ZHANG Dian-hua LI Xu ZHANG Jin DU De-shun | 2010 | Journal of Iron and Steel Research(International)2010，17，2： | 30 |
| 6 | Stress Corrosion of X80 Pipeline Steel Welded Joints by Slow Strain Test in NACE H_2S Solutions显示文摘The X80 pipeline steel was welded with the way of submerged arc welding. The SST (slow strain test) of the welded joint samples in the air, NACE (National Association of Corrosion Engineers) solution (no H2S), NACE solution (saturated H2S) was performed to research the sensibility index of SCC (stress corrosion cracking) Iscc. The morphologies of the welded joint fractures and the fracture modes were observed with SEM (scanning electron microscope), and the fracture chemical compositions were analyzed with EDS (energy dispersive spectrometer), respectively. The fracture mechanisms of the welded joints were discussed. The results show that sensibility index of SCC in the air is not obvious, the fracture is dimple, and the mode of fracture is ductile fracture. The sensibility index of SCC in NACE solution (no H2S) is 13.21%, the stress corrosion is not obvious. The sample fracture shows quasi cleavage+dimple, and the fracture mode is toughness+brittle rupture. The sensibility index of SCC in NACE solution (saturated H2S) is 56.94%, the plastic loss is the most serious, appearing an obvious stress corrosion tendency, and there is no obvious necking phenomenon. The fracture mode is brittle fracture, and the sample fracture has a high sulfur concentration, prompting S to a aliquation of crisp crystal in the welded zone, and making its mechanical properties worsen. | KONG De-jun WU Yong-zhong LONG Dan | 2013 | Journal of Iron and Steel Research(International)2013，20，1： | 29 |
| 7 | Coexistence Theory of Slag Structure and Its Application to Calculation of Oxidizing Capability of Slag Melts显示文摘The coexistence theory of slag structure and it's application to calculation of the oxidizing capabilities of slag melts is described. It is shown that the law of mass action can be widely applied to the calculation of oxidizing capabilities of slag melts in combination with the coexistence theory of slag structure.For slag melts containing basic oxides FeO and MnO, their oxidizing capabilities can be expressed by NFetO=NFeO+6NFe2O3, while for slag melts containing basic oxides CaO, MgO, etc., in addition to FeO and MnO, their oxidizing capabilities can be given as NFetO=NFeO+6NFe2O3+8NFe3O4. | ZHANG Jian | 2003 | Journal of Iron and Steel Research(International)2003，10，1： | 29 |
| 8 | Effect of Niobium on Microstructure of Cast AISI H13 Hot Work Tool Steel显示文摘The effect of niobium addition on the microstructure of cast AISI H13 hot work tool steel was evaluated by using EDX analyzer attached to the scanning electron microscope. The volume percent of eutectic area and eutectic cell size and also volume percent of different carbides of new steel, which is heat treated under different conditions, are also determined. The results show that the a niobium addition modifies the cast structure of Nb-alloyed hot work tool steel, and reduces the size and volume of eutectic cells,and increases the maximum hardness of the steel. | Shahram Kheirandish Ahmad Noorian | 2008 | Journal of Iron and Steel Research(International)2008，15，4： | 28 |
| 9 | Phosphorus Removal of High Phosphorus Iron Ore by Gas-Based Reduction and Melt Separation显示文摘A new method (gas-based separation plus melt separation) has been proposed to remove phosphorus of the high phosphorus iron ore which was 1.25% of phosphorus content and 50.0% of iron content.HSC chemistry package and the coexistence theory of slag structure were adopted for theoretical analysis.The gas-based reduction was carried out using a fixed bed reactor and the ore sample of 80 g with an average particle size of 2 mm were reduced using CO or H2 at temperature of 1073 K for 5 hours.50 g of the reduced sample with 3.0% CaO as additive was then subjected to melt separation in an electric furnace at temperature of 1873 K under Ar atmosphere.In each run,SEM,EDS,optical microscopic examination and chemical analysis of the reduced ore sample,the metal sample and the slag sample were conducted.Results of all gas-based reduction experiments showed that iron metallization ratios were some 65% and the phosphorus compounds in the ore remained unchanged.It was agreed well with the simulations except for the iron metallization rate being less than predicted value;this difference was attributed to kinetics.Results of melt separation experiments showed that P content in metal samples is 0.33% (metal sample from H2 reduction product) and 0.27 % (metal sample from CO reduction product).The phosphorus partition ratios of both cases were less than predicted values.Some P in the metal samples existed as slag inclusion was considered to be the reason for this discrepancy. | TANG Hui-qing GUO Zhan-cheng ZHAO Zhi-long | 2010 | Journal of Iron and Steel Research(International)2010，17，9： | 27 |
| 10 | Two-Dimensional Transient Temperature Field of Finish Rolling Section in Hot Tandem Rolling显示文摘Comprehensively considering the factors such as descaling cooling, air cooling, water cooling, frictional heat and deformation heat in gap of every stand, heat conduction between work roll and strip etc, a model of two-dimensional transient temperature field of finish rolling section in hot tandem rolling was built with finite difference method to calculate the temperature fields of strip and work roll. So two-dimensional accurate analysis and calculation of strip temperature were realized, and the theoretical basis for predicting and controlling strip temperature was provided. The simulated results show that the model is practical and reliable. | YANG Li-po PENG Yan LIU Hong-min | 2004 | Journal of Iron and Steel Research(International)2004，11，4： | 26 |
| 11 | Mathematical Model for Electroslag Remelting Process显示文摘A mathematical model, including electromagnetic field equation, fluid flow equation, and temperature field equation, was established for the simulation of the electroslag remelting process. The distribution of temperature field was obtained by solving this model. The relationship between the local solidification time and the interdendritic spacing during the ingot solidification process was established, which has been regarded as a criterion for the evaluation of the quality of crystallization. For a crucible of 950 mm in diameter, the local solidification time is more than 1 h at the center of the ingot with the longest interdendritic spacing, whereas it is the shortest at the edge of the ingot according to the calculated results. The model can be used to understand the ESR process and to predict the ingot quality. | DONG Yan-wu JIANG Zhou-hua LI Zheng-bang | 2007 | Journal of Iron and Steel Research(International)2007，14，5： | 25 |
| 12 | Effect of Surface Mechanical Attrition Treatment on Corrosion Behavior of 316 Stainless Steel显示文摘The nanocrystalline microstructure of the surface of 316 stainless steel (316SS) induced by surface mechanical attrition treatment (SMAT) was determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The technique of hydrogen embrittlement was first used to obtain the information of the brittleness cleavage plane. The effects of SMAT and the following annealing process on the corrosion behavior of 316SS were investigated by potentiodynamic polarization curves and potentiostatic critical pitting temperature measurements. The results demonstrated that the nanocrystalline layer with an average grain size of 19 nm was produced. However, there were lots of cracks on the surface, which led to the degradation in the corrosion resistance of 316SS after SMAT. Nevertheless, after annealing treatment, the corrosion resistance of the nanocrystalline surface had been improved greatly. The higher the annealing temperature, the better was the corrosion resistance. | HAO Yun-wei DENG Bo ZHONG Cheng JIANG Yi-ming LI Jin | 2009 | Journal of Iron and Steel Research(International)2009，16，2： | 26 |
| 13 | Austenite Grain Growth Behavior of X80 Pipeline Steel in Heating Process显示文摘Through changing soaking temperature and soaking time,austenite grain growth behavior of X80 pipeline steel under different heating conditions was studied. Relationships of average grain size to soaking temperature and time were obtained respectively. The results show that the prior austenite grains grow with the increase of soaking temperature and time. When soaking temperature is lower than 1180℃,austenite grain size and growth rate are small; when it higher than 1200℃,austenite grains grow rapidly and abnormal grain growth appears. For soaking at 1180℃,austenite grain growth rate is initially high and then decreases when soaking time exceeds 1h. | DUAN Lin-na WANG Ji-man LIU Qing-you SUN Xin-jun CAO Jian-chun | 2010 | Journal of Iron and Steel Research(International)2010，17，3： | 25 |
| 14 | Influence of Tempering Process on Mechanical Properties of 00Cr13Ni4Mo Supermartensitic Stainless Steel显示文摘To investigate the influence of tempering process on microstructural evolutions and mechanical properties of 00Cr13Ni4Mo supermartensitic stainless steel(SMSS),specimens were tempered in the temperature range of 520-720 ℃ for 3 h followed by air cooling and an optimized tempering temperature was chosen to prolong holding time from 3 to 12 h.After heat treatments,microstructure examination was conducted by scanning electron microscope,X-ray diffraction examinations,hardness measurements and tensile tests.The results revealed that the superior mechanical properties were achieved by quenching at 1040 ℃ for 1 h+water cooling and tempering at 600 ℃ for 3 h+air cooling.Increasing isothermal tempering time could improve the toughness notably.It was believed that the property was correlated with the microstructure of tempered lath martensite and retained austenite.More retained austenite content is beneficial to the higher toughness of the SMSS. | ZOU De-ning HAN Ying ZHANG Wei FANG Xu-dong | 2010 | Journal of Iron and Steel Research(International)2010，17，8： | 26 |
| 15 | Prospects for Variable Gauge Rolling:Technology,Theory and Application显示文摘Variable gauge rolling(VGR)is a new technology to produce flat products with different thicknesses(FDT),which could be used to replace conventional flat products in order to save metals and reduce structure mass.The method of VGR was introduced for investigating new problems in rolling theory of VGR,and the new formulas for calculating parameters of VGR were proposed.Besides,some results of numerical simulation by finite element method were described.As an example,the products applications of FDT in bridge construction,ship building and auto manufacturing were presented.Finally,the prospects for VGR and FDT were discussed. | LIU Xiang-hua | 2011 | Journal of Iron and Steel Research(International)2011，18，1： | 26 |
| 16 | Effect of Laser Power on the Cladding Temperature Field and the Heat Affected Zone显示文摘H13 powder is cladded on steel P20(base)by continuous CO2 laser,and the influence of technological parameters such as the laser power is analyzed.The 3-D model of synchronous powder feeding is built under Gauss heat source.The simulative results in the heat affected zone are compared with the experimental ones,and the average errors of width and depth are 15% and 4.5%,respectively.It is found that the simulative results provide basic data for investigating of laser cladding further. | LUO Fang YAO Jian hua HU Xia xia CHAI Guo-zhong | 2011 | Journal of Iron and Steel Research(International)2011，18，1： | 25 |
| 17 | Development of Intensified Technologies of Vanadium-Bearing Titanomagnetite Smelting显示文摘It was very difficult for the smelting of vanadium-bearing titanomagnetite by blast furnace because the content of TiO2 of blast furnace slag could amount to 20%-25%.After long term development and continuous improvement,special intensified smelting technologies for vanadium-bearing titanomagnetite by blast furnace were obtained and improved gradually.With the improvement of beneficiated material level and equipment level,smelting intensity has been increased gradually and the highest comprehensive smelting intensity reached 1.45 t/(m3·d).Technical-economic indexes of blast furnace have also been increased remarkably.The highest utilization coefficient exceeded 2.7 t/(m3·d)on the condition that the burden grade was only about 50%. | FU Wei-guo WEN Yong-cai XIE Hong-en | 2011 | Journal of Iron and Steel Research(International)2011，18，4： | 26 |
| 18 | Microstructure and Abrasive Wear Behavior of Medium Carbon Low Alloy Martensitic Abrasion Resistant Steel显示文摘The effect of processing parameters such as hot rolling and heat treatment on microstructure and mechanical properties was investigated for a new 0.27mass% C and Ni,Mo-free low alloy martensitic abrasion resistant steel.The three-body impact abrasive wear behavior was also analyzed.The results showed that two-step controlled rolling besides quenching at 880℃and tempering at 170℃could result in optimal mechanical property:the Brinell hardness,tensile strength,elongation and-40 ℃impact toughness were 531,1 530 MPa,11.8% and 58J,respectively.The microstructure was of fine lath martensite with little retained austenite.Three-body impact abrasive wear results showed that wear mechanism was mainly of plastic deformation fatigue when the impact energy was 2J, and the relative wear resistance was 1.04times higher than that of the same grade compared steel under the same working condition.The optimal hardness and toughness match was the main reason of higher wear resistance. | Xiang-tao DENG Zhao-dong WANG Yi HAN Hui ZHAO Guo-dong WANG | 2014 | Journal of Iron and Steel Research(International)2014，21，1： | 25 |
| 19 | Microstructure and Properties of Hot Working Die Steel H13MOD显示文摘Compared with H13 steel,the influences of different heat treatment process on the microstructure and properties of the new type of hot working die steel H13MOD were studied.The results show that the complete austenitizing temperature of H13MOD is around 1 030℃ and the quenching hardness achieves the maximum value at this temperature.While for H13,the complete austenitizing temperature is above 1 100℃ and the quenching hardness rise constantly with the quenching temperature increasing.In quenching process,the undissolved MC carbides can prevent the coarsening of grain in both steels.With the rise of quenching temperature,when MC carbides dissolve completely,the grain grows quickly.The hardness and strength of H13MOD at higher tempering temperature(above570℃)are nearly the same as those of H13,but its toughness is higher than that of H13.Mo2C carbide is the main strengthening phase in H13MOD,which is attributed to the higher content of Mo.The quantity of VC eutectic carbides is reduced because of lower content of V in H13MOD,which plays an important role in enhancing the impact toughness of H13MOD.Under a certain strength condition,H13MOD steel can be used in the environment that higher toughness is required and the service life of die casting mold can be improved. | ZHOU Jian MA Dang-shen CHI Hong-xiao CHEN Zai-zhi LI Xiang-yang | 2013 | Journal of Iron and Steel Research(International)2013，20，9： | 25 |
| 20 | Microstructure,Properties and Heat Treatment Process of Powder Metallurgy Superalloy FGH95显示文摘Microstructure and properties of nickel-based powder metallurgy (PM) superalloy were presented. Effects of nonmetallic inclusions and heat treatment on microstructure and properties were discussed. Development tendency of microstructure and properties of PM superalloy was presented. | GUO Wei-min WU Jian-tao ZHANG Feng-ge ZHAO Ming-han | 2006 | Journal of Iron and Steel Research(International)2006，13，5： | 24 |
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