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Effects of carbon co.tent on the microstructure and tensile properties of a low-density steel

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase co.ponents of low-density steels and influence the mechanical *** this study,a new method to co.trol the carbon co.tent and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon co.tent induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon co.tent within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon co.tent decarburization strengthening mechanisms work hardening behavior

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Experimental study on 830 MPa grade pipeline steel co.taining chromium

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 273-277页

作者： Yi Ren Shuai Zhang Shuang Wang Wen-yue Liu Technical Center Anshan Iron ＆ Steel Co. Ltd. Ar shan 114009 China

The diversity of microstructure and properties of 830 MPa grade pipeline steel co.taining chromium was investigated by optical microsco.e and transmission electron microsco.y. The main microstructures were multiple co.figurations, co.taining lath bainite and granule bainitc. Mechanical properties test results showed that the yield strength and tensile strength improved with increasing chromium co.tent. The toughness and elongation decreased at the same time, so temper process was introduced. Appling proper temper parameters, the values of toughness and elongation were improved dramatically, and the strength decreased slightly.

关键词： chromium high strength pipeline steel thermo-mechanical co.trolled process

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Effect of Mn co.tent on microstructure, tensile and impact properties of SA508Gr.4N steel for reactor pressure vessel

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Journal of Iron and steel Research International 2020年第4期27卷 461-470页

作者： Xi-kou He Zhi-qiang Yang Zhen Wang Shi-bin Qiao Zheng-dong Liu Institute for Special steels Central Iron and Steel Research InstituteBeijing 100081China Technology Center of Ma’anshan Iron and steel co. Ltd.Ma’anshan 243000AnhuiChina

The effect of manganese(Mn)on the microstructure,tensile and impact properties of SA508Gr.4N steel has been experimentally *** influence of Mn co.tent on the substructure of SA508Gr.4N steel was investigated using the scanning electron microsco.e,electron back-scattered diffractometer and transmission electron *** was found that the increased Mn co.tent had a beneficial effect on both strength and *** of microstructure revealed smaller size of block and larger number of high-angle grain boundaries with higher Mn *** change of the ultimate tensile strength and toughness with increasing Mn co.tent was attributed to the increased hardenability,the number of high-angle grain boundaries and the crack propagation path by the block refining.

关键词： Mn element SA508Gr.4N steel Microstructure Charpy impact toughness Substructure

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EXPERT SYSTEM FOR SINTER CHEMICAL co.POSITION co.TROL BASED ON ADAPTIVE PREDICTION

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Transactions of Nonferrous Metals Society of China 1996年第1期6卷 47-50页

作者： Fan Xiaohui Wang Haidong Chen Jin Huang Tianzheng Yang Shinong Wang Yueli Zheng Tianzhong Department of Mineral Engineering Central South University of TechnologyChangsha 410083 anshan Iron&steel co. Anshan 114021

In order to stabilize the sinter chemical co.position,the expert system for co.position co.trol based on adaptive prediction has been developed on the basis of modern co.trol theory and artificial *** has been verified by using real data at No.3 Sintering Plant of anshan Iron and steel co.,and satisfactory results have been obtained.

关键词： sinter chemical co.position adaptive prediction expert system for co.trol

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Effect of magnetic field on elements segregation in electroslag ingot

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Journal of Iron and steel Research International 2022年第3期29卷 434-444页

作者： Gang Gao Chun-li Zhu Xiao-fang Shi Li-zhong Chang School of Metallurgy Engineering Anhui University of TechnologyMa’anshan243002AnhuiChina SINO steel Ma’anshan Institute of Mining Research co. Ltd.Ma’anshan243000AnhuiChina

In order to improve the production efficiency of electroslag remelting process and the solidification quality of electroslag ingot,a novel electroslag furnace with electromagnetic stirring was designed and the effects of external magnetic field and different electrical parameters on electroslag remelting process were *** distribution of carbon,chromium,phosphorus and co.pactness in electroslag ingot was analyzed through original position analysis *** show that the external magnetic field accelerates the remelting of co.sumable *** the co.dition of remelting voltage of 34 V and current of 1500 A,the remelting rate of metal co.sumable electrode increases from 20 to 27 mm min−1 when the magnetic induction intensity of 62×10^(−4) and 108×10^(−4) T is ***,the remelting current decreases from 1500 to 1100 A under the co.dition of co.stant remelting rate and remelting voltage,thereby reducing the energy *** effect of external magnetic field on the segregation of different elements in electroslag ingot is *** the experimental co.ditions,the carbon segregation is unremarkable,but the phosphorus segregation is improved when the electromagnetic force generated by the interaction between the external magnetic field and the remelting current is ***,the excessive electromagnetic force aggravates the segregation of carbon and *** the increase in electromagnetic force,the chromium segregation gradually increases.

关键词： Electroslag remelting Magnetic field Solidification Segregation Remelting rate

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Cleaning IF molten steel with dispersed in-situ heterophases induced by the co.posite sphere explosive reaction in RH ladles

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International Journal of Minerals,Metallurgy and Materials 2011年第2期18卷 144-149页

作者： Fu-ping Tang Zhen Li Xiao-feng Wang Ben-wen Chen Peng Fei anshan Iron ＆ steel Group co.pany Anshan 114014 China

A novel fine inclusion removal technology was put forward with dispersed in-situ heterophases induced by the co.posite sphere explosive reaction. A co.posite sphere with this function was designed and prepared using a laboratory scale batch-type balling disc （at 12 r/min）, and the co.posite sphere was fed at the end of the RH refining process. The results indicate that inclusions in the IF molten steel can be removed effectively by feeding co.posite spheres in RH ladle. co.pared with co.ventional inclusion removal technology, using this novel technology, the amount of oxide inclusions can be decreased to a lower level and the inclusion size beco.es finer, the total oxygen co.tent in the as-cast slab can approach 5×10？6, and the co.t per ton of steel produced can be reduced by 5-12 Yuan RMB.

关键词： IF steel refining bubbles slags filtration inclusions

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Effect of Pre-deformation on Grain Ultrafining by Intercritical Deformation in Low-Carbon Microalloyed steels

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Acta Metallurgica Sinica(English Letters) 2018年第10期31卷 1038-1048页

作者： Ba Li Qing-You Liu Shu-Jun Jia Yi Ren Bing Wang Central Iron and steel Research Institute Beijing 100081China Iron and steel Research Institute Ansteel Group Co. Ltd.Anshan 114009 China

In this study, the effect of pre-deformation at recrystallization and non-recrystallization zone on the grain ultrafining by the subsequent intercritical deformation （ID） was investigated on low-carbon microalloyed steel. The results showed that ultrafine grain microstructure with an average size of - 1.0 μm was fabricated through pre-deformation in the recrys- tallization zone followed by ID. When pre-deformed at the non-recrystallization zone prior to ID, the grain size increased to 1.6 μm with a heterogeneous distribution along with the well-developed dynamic reco.ery of ferrite. The grain ultrafining mechanism was attributed to the co.bined action of the deformation-induced ferrite transformation and the co.tinuous dynamic recrystallization. In particular, the co.tinuous dynamic recrystallization process during ID occurred on the pro-eutectoid ferrite as a result of the subgrain rotation mechanism and the absorbing dislocations mechanism.

关键词： Low-carbon microalloyed steels Intercritical deformation Ultrafine grain co.tinuous dynamic recrystallization Deformation-induced ferrite transformation

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Dynamic recrystallization behavior and finite element analysis of a low-alloy high-strength steel

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Journal of Iron and steel Research International 2024年第11期31卷 2828-2851页

作者： Yu-hao Liu Hao-qing Tang Guo-ming Zhu Bao-qiao Wu Jie Wang Meng Xia School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Ma’anshan Iron&steel co. Ltd.Ma’anshan243000AnhuiChina

The axial single-pass high temperature co.pression test of a hot-rolled extra-large heavy H-beam steel co.tinuous casting billet (Q420 steel) under different deformation co.ditions through the Gleeble-1500D thermomechanical simulator was carried out. The modified Johnson–co.k model and the Arrhenius model based on strain-co.pensated of Q420 steel were established. The latter can more accurately reflect the flow behavior of Q420 steel. For the simulation of thermal co.pression, dynamic recrystallization (DRX) co.relation models were developed and imported into DEFORM-3D software. Acco.ding to simulation results, high temperatures and low strain rates are co.ducive to DRX. Due to the uneven distribution of equivalent strain and temperature in different parts of the same section, DRX volume fraction and grain size are unevenly distributed. At the center, the DRX volume fraction is the largest and the grain size is the smallest. The upper and lower edges are vice versa, and the left and right edges are centered. Optical microsco.y and electron backscatter diffraction characterization methods were used to study the hot co.pression microstructure under different deformation co.ditions. As the deformation amount increases, co.plete DRX is gradually reached. The original austenite grain gradually beco.es smaller. Local average misorientation decreases with the progression of DRX but increases with the amount of deformation after co.pletion of DRX. As the temperature increases and the rate decreases, low angle grain boundaries and medium angle grain boundaries gradually decrease, and high angle grain boundaries gradually increase, indicating that dislocation decreases gradually, DRX grains increase gradually, and martensitic multilayer structure is obvious. As austenite grain size increases, the length of martensite lath increases, and the number of martensite blocks decreases.

关键词： H-beam steel Q420 steel High temperature co.stitutive model Dynamic recrystallization Finite element analysis

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The Mechanism of Heating Rate on the Seco.dary Recrystallization Evolution in Grain Oriented Silico. steel

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期 275-282页

作者：高倩 LI Jun WANG Xianhui CAO Laifu GONG Jian LI Bo Central Iron and steel Research Institute Group Shougang Zhixin Electromagnetic Material R&D (Beijing) co. Ltd. Beijing Shougang co. Ltd.

Grain-oriented silico. steels were prepared at different heating rates during high temperature annealing, in which the evolution of magnetic properties, grain orientations and precipitates were studied. To illustrate the Zener factor, the diameter and number density of precipitates of interrupted testing samples were statistically calculated. The effect of precipitate ripening on the Goss texture and magnetic property was investigated. Data indicated that the trend of Zener factor was similar under different heating rates, first increasing and then decreasing, and that the precipitate maturing was greatly inhibited as the heating rate increased. Seco.dary recrystallization was developed at the temperature of 1 010 ℃ when a heating rate of 5 ℃/h was used, resulting in Goss, Brass and {110} oriented grains growing abnormally and a magnetic induction intensity of 1.90T. Furthermore, increasing the heating rate to 20 ℃/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss texture. However, when the heating rate was extremely fast, such as 40 ℃/h, poor seco.dary recrystallization was developed with many island grains, co.responding to a decrease in magnetic induction intensity to 1.87 T. At a suitable heating rate of 20 ℃/h, the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset seco.dary recrystallization temperature of 1 020 ℃ were found among the experimental variables in this study. The heating rate affected the initial temperature of seco.dary recrystallization by co.trolling the maturation of precipitates, leading to the deviation and dispersion of Goss texture, thereby reducing the magnetic properties.

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Hot working process optimization of Fe-20Mn-19Cr-0.5C-0.6N steel by activation energy, power dissipation and microstructural evolution

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Journal of Iron and steel Research International 2019年第8期26卷 856-865页

作者： Meng-du Peng Jie Shi Wen-chao Yu Bing Cui Ting Sun Xiao-yuan Li Mao-qiu Wang Institute for Special steels Central Iron and Steel Research Institute Beijing 100081 China Technology Center Ma'anshan Iron and Steel Co. Ltd. Ma'anshan 243000 Anhui China School of Materials Science and Engineering Anhui University of Technology Ma'anshan 243000 Anhui China

Hot deformation behavior of an Fe-20Mn-19Cr-0.5C-0.6N high-nitrogen austenitic steel has been studied by isothermal co.pression tests in deformation temperature range of 800-1200℃ and strain rate range of 0.01-10 s^-1. Results indicate that the Fe-20Mn-19Cr-0.5C-0.6N steel has high deformation resistance due to strong hindering effect on dislocation moving by nitrogen-induced lattice misfit. The twinning-induced plasticity effect is gradually suppressed with the increase in deformation temperature, and high-temperature plastic deformation mechanism by twinning is gradually replaced by dislocation planar slip. The deformation resistance is up to 343 MPa at deformation co.ditions of (1000 ℃, 0.01 s^-1), which is over 100 MPa higher than that in martensitic steel and 50 MPa higher than that in austenitic steel. Besides, value of deformation activation energy for the Fe-20Mn-19Cr-0.6N steel is up to 784 kJ mol^-1. Power dissipation efficiency is lower than 0.13, while hot processing map exhibits a very wide range of working area. The optimum hot working process obtains at deformation temperature range of 950-1200℃ and strain rate range of 0.01-10 s^-1, when deformation acti-vation energy is less than 662.6 kJ mol^-1, power dissipation efficiency exceeds 0.22, dynamic recrystallization fraction is over 46.1% and microstructures are without instable characteristics.

关键词： High-nitrogen austenitic steel Flow behavior co.stitutive equation Deformation resistance Deformation activation energy Hot processing map

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