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Tailoring the austenite characteristics via dual nanoparticles to synergistically optimize the strength-ductility in cold rolled medium mn steel

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Journal of Materials Science & Technology 2024年第2期169卷 158-171页

作者： Qizhe Ye Haokai Dong Qinyi Guo Yishuang Yu Lijie Qiao Yu Yan Beijing Advanced Innovation Center for Materials Genome Engineering Corrosion and Protection CenterInstitute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

In this work,we proposed a novel Cu/θdual nanoparticles strategy to tailor the austenite characteris-tics of a medium mn steel via a tempering-annealing process to optimize the mechanical *** explored the effects of Cu-rich particles and cementite precipitated in the tempering process on the austenite reversion during the subsequent annealing *** experiments and numerical simula-tions verified that the austenite inherited from cementite had a finer size and a higher mn enrichment compared with the austenite originating from the tempered martensite *** addition,quantitative evaluations revealed that the pinning effect exerted by the Cu-rich particles could significantly hinder theα/γinterface migration and the recrystallized grain growth,thereby further refining the final *** contributions from the effects of dual nanoprecipitates on the austenite reversion,the heterogeneous austenite grains inherited from varying nucleation sites ensured the sustained and gradual deformation-induced martensite and twinning ***,the Cu-added steels subjected to a tempering-annealing process achieved synergetic enhancement of the tensile strength from 1055 MPa to 1250 MPa and elongation from 33%to 45%.This strategy may provide new guidance for the development and alloy design of high-performance medium mn steels.

关键词： Dual nanoparticles medium mn steel Tempering-annealing process Austenite reversion Mechanical properties

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A strong and ductile medium mn steel manufactured via ultrafast heating process

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Journal of Materials Science & Technology 2022年第2期97卷 54-68页

作者： Pengyu Wen Bin Hu Jiansheng Han Haiwen Luo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingXue Yuan Lu 30Beijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingXue Yuan Lu 30Beijing 100083China

Ultrafast heating(UFH)at the rates of 10-300℃/s was employed as a new strategy to anneal a coldrolled 7 wt%mn steel,followed by the immediate *** deformed strain-induced martensite and lightly-deformed thermal martensite,both had been already enriched with C and mn before,transformed to fine and coarse austenite grains during the UFH,leading to the bimodal size *** with the long intercritical annealing(IA)process,the UFH processes produced larger fraction of RA grains(up to 37%)with a high density of dislocation,leading to the significant increase in yield strength by 270 MPa and the product of strength and elongation up to 55 GPa%due to the enormous work hardening *** a significant strengthening is first attributed to high density dislocations preserved after UFH and then to the microstructural refinement and the precipitation strengthening;whilst the sustainable work hardening is attributed to the successive TRIP effect during deformation,resulting from the large fraction of RA instantly formed with the bimodal size distribution during ***,the results on the microstructural characterization,thermodynamics calculation on the reverse transformation temperature and the kinetic simulations on the reverse transformation all suggest that the austenitization during UFH is displacive and involves the diffusion and partition of ***,we propose that it is a bainite-like transformation.

关键词： Ultrafast heating process Austenite reversion medium mn steel Mechanical properties Transformation-induced plasticity

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Carbide precipitation behavior and mechanical properties of micro-alloyed medium mn steel

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Journal of Materials Science & Technology 2020年第12期47卷 122-130页

作者： Luhan Hao Xiangji Guangqian Zhang Wei Zhao Mingyue Sun Yan Peng National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China Shenyang National Laboratory for Material Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China

The carbide precipitation behavior and mechanical properties of advanced high strength steel deformed at different temperatures are investigated by X-ray diffractometer(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM) equipped with an energy dispersing spectroscopy(EDS),and tensile *** medium mn steel was subjected to controlled deformation up to 70% at 750℃,850℃,950℃,and 1050℃,and then quenched with water to room temperature,followed by intercritical annealing at 630℃ for 10 *** comparison with the undeformed and quenched specimen,it can be concluded that acicular cementite precipitates during the quenching and cooling process,while granular NbC is the deformation induced precipitate and grows during the following annealing *** the deformation temperature increases from 750℃ to 1050℃,the product of strength and elongation increases at first and then *** smallest average size of second phase particles(20 nm) and the best mechanical properties(32.5 GPa%) can be obtained at the deformation temperature of 950℃.

关键词： Advanced high strength steel medium mn steel Thermal deformation Intercritical annealing The product of strength and elongation

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Carbide precipitates and mechanical properties of medium mn steel joint with metal inert gas welding

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Journal of Materials Science & Technology 2021年第16期75卷 48-58页

作者： Jiang Yang Honggang Dong Yueqing Xia Peng Li Xiaohu Hao Yaqiang Wang Wei Wu Baosen Wang School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China Baosteel Central Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 200431China

medium mn steel was metal inert gas(MIG)welded with NiCrMo-3 and 307 Si filler *** effect of filler wires on the microstructure and mechanical properties of joint was investigated,and the carbide precipitates were contrastively *** results revealed that the microstructure of weld metal,heat-affected zone and base metal are *** grain coarsening occurred in the heat-affected zone(HAZ),and the maximum grain size grew up to 160μ*** HAZ,C and Cr segregated at grain boundaries,the carbides was identified as Cr7 *** dispersive(Nb,Mo)C phase was also found in weld metal with NiCrMo-3 filler *** the welded joints failed in HAZ during tensile *** tensile strength of welded joint with NiCrMo-3 filler wire was 675 MPa,which is much higher than that with307 Si filler *** comparison to base metal,higher microhardness and lower impact toughness were obtained in HAZ for these two welded joints,which was attributed to the precipitation of Cr7 C3 phase and grain *** impact toughness around the fusion line is the worst for these two welded joints.

关键词： medium mn steel MIG welding Microstructure Precipitate Mechanical property

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Hot ductility behavior of a Fe-0.3C-9mn-2Al medium mn steel

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 422-429页

作者： Yong-jin Wang Shuai Zhao Ren-bo Song Bin Hu School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The hot ductility of a Fe-0.3C-9mn-2Al medium mn steel was investigated using a Gleeble3800 thermo-mechanical *** tensile tests were conducted at different temperatures(600-1300℃)under a constant strain rate of 4×10^(−3)s^(−1).The fracture behavior and mechanism of hot ductility evolution were *** showed that the hot ductility decreased as the temperature was decreased from 1000℃.The reduction of area(RA)decreased rapidly in the specimens tested below 700℃,whereas that in the specimen tested at 650℃was lower than 65%.Mixed brittle-ductile fracture feature is reflected by the coexistence of cleavage step,intergranular facet,and dimple at the *** fracture belonged to ductile failure in the specimens tested between 720-1000℃.Large and deep dimples could delay crack *** change in average width of the dimples was in positive proportion with the change in *** wide austenite-ferrite intercritical temperature range was crucial for the hot ductility of medium mn *** formation of ferrite film on austenite grain boundaries led to strain *** point elongation occurred at the austenite-ferrite intercritical temperature range during the hot tensile test.

关键词： medium mn steel hot ductility reduction of area fracture behavior microstructure characterization

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Influences of Austenization Temperature and Annealing Time on Duplex Ultrafine Microstructure and Mechanical Properties of medium mn steel

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Journal of Iron and steel Research(International) 2015年第1期22卷 42-47页

作者： Chang WANG Wen-quan CAO Yun HAN Cun-yu WANG Chong-xiang HUANG Han DONG Central Iron and steel Research Institute Shougang Research Institute of Technology School of Aeronautics and Astronautics Sichuan University

A duplex ultrafine microstructure in a medium manganese steel （0.2C-5mn） was produced by austenite re- verted transformation annealing （ART-annealing）. The microstructural evolution during annealing was examined by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and X-ray diffraction （XRD）. Based on the microstructure examination, it was found that some M3C type carbides appeared in the martensitic matrix at the beginning of the ART-annealing. But with further increasing annealing time, these carbides would be dissolved and finally disappeared. Meanwhile, the austenite lath was developed in the ART-annealing process and the volume fraction of austenite increosed with the increase of the annealing time, which resulted in a duplex microstructure con- sisting of ultrafine-grained ferrite and large fraction of reverted austenite after long time annealing. The mechanical property examinations by uniaxial tensile tests showed that ART-annealing （6 h, 650 ℃） resulted in a superhigh product of strength to elongation up to 42 GPa ·%.

关键词： medium mn steel microstructure mechanical property austenization annealing

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Recent developments and perspectives of advanced high-strength medium mn steel:from material design to failure mechanisms

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Materials Futures 2022年第3期1卷 9-33页

作者： Chengpeng Huang Chen Hu Yuxuan Liu Zhiyuan Liang Mingxin Huang Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongPeople’s Republic of China Shenzhen Institute of Research and Innovation The University of Hong KongShenzhenPeople’s Republic of China Songshan Lake Materials Laboratory Dongguan 523808People’s Republic of China

Advanced high-strength steels are key structural materials for the development of next-generation energy-efficient and environmentally friendly *** mn steel,as one of the latest generation advanced high-strength steels,has attracted tremendous attentions over the past decade due to its excellent mechanical ***,the state-of-the-art developments of medium mn steel are systematically reviewed with focus on the following crucial aspects:(a)the alloy design strategies;(b)the thermomechanical processing routes for the optimizations of microstructure and mechanical properties;(c)the fracture mechanisms and toughening strategies;(d)the hydrogen embrittlement mechanisms and improvement strategies.

关键词： medium mn steel alloy design mechanical property fracture mechanism hydrogen embrittlement

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Mechanism of the Interfacial Reaction of AI_2O_3/medium mn steel Containing Nb

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Journal of Materials Science & Technology 1993年第4期9卷 304-306页

作者： Sirong YU Yaohui LIU Zhenming HE Dept.of Metallic Materials Engineering,Jilin University of Technology,Changchun,130022,China

The mechanism of the interfacial reaction of Al_2O_3/medium mn steel containing Nb was studied by means of the observation on the interfacial reaction phenomenon of Al_2O_3/medium mn steel,and the analyses on the interracial *** results show that when T≥1550℃,the interfacial reac- tion of Al_2O_3/medium mn steel containing Nb *** the medium mn steel matrix,Nb exists in the form of *** are the nucleating base of CO gas bubbles.

关键词： Nb medium mn steel Al_2O_3 interfacial reaction

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形貌优化提高富TRIP效应中锰钢的抗氢脆性能

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Science China Materials 2023年第11期66卷 4258-4266页

作者：刘宇轩曹祚恒黄成鹏胡晨黄明欣 Department of Mechanical Engineering The University of Hong KongHong Kong 999077China Shenzhen Institute of Research and Innovation The University of Hong KongShenzhen 518000China

相变诱发塑性(TRIP)效应通常可显著提高中锰钢的加工硬化能力,从而获得出色的强度和塑性组合.然而,变形过程中生成的新鲜马氏体极易发生氢脆,是新型高强中锰钢开发的瓶颈问题.我们在此提出了一种长带状形貌来减轻新鲜马氏体引起的氢脆.... 详细信息

相变诱发塑性(TRIP)效应通常可显著提高中锰钢的加工硬化能力,从而获得出色的强度和塑性组合.然而,变形过程中生成的新鲜马氏体极易发生氢脆,是新型高强中锰钢开发的瓶颈问题.我们在此提出了一种长带状形貌来减轻新鲜马氏体引起的氢脆.温轧制备的长带状中锰钢相比传统临界退火制备的等轴晶形貌中锰钢,不仅具有同等的高加工硬化率,而且抗氢脆性能更好.等轴晶形貌中锰钢由于缺乏有效的阻碍机制,氢裂纹一旦出现便能快速扩展.相反,对于长带状形貌中锰钢,氢裂纹会被晶界和相界所阻碍或偏转.本形貌设计可以提高其他富TRIP效应的钢和合金的抗氢脆性能.

关键词： medium mn steel TRIP effect morphology hydro-gen embrittlement warm rolling

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Counter-balancing effects of Si on C partitioning and stacking fault energy of austenite in 10mn quenching and partitioning steel

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Journal of Materials Science & Technology 2022年第3期98卷 248-257页

作者： Dong Hwi Kim Jee-Hyun Kang Hojun Gwon Joo Hyun Ryu Sung-Joon Kim Graduate Institute for Ferrous Technology Pohang University of Science and TechnologyPohang 37673Republic of Korea School of Materials Science and Engineering Institute of Materials TechnologyYeungnam UniversityGyeongsan 38541Republic of Korea POSCO Technical Research Laboratories POSCOGwangyang 57807Republic of Korea

Silicon is an essential alloying element in quenching and partitioning(Q&P)steels,because it is known to suppress carbide precipitation during partitioning step and promote carbon partitioning to stabilize *** 2 wt%Si was added to 10mn-2Al-0.2C steel,the size and fraction of the carbides formed during partitioning became smaller than in the Si-free ***,the suppression of carbide formation promoted C partitioning into austenite as ***,austenite stability was always lower with Si under the equivalent partitioning condition because Si effectively decreased the stacking fault energy of *** partitioning progressed,the both yield and tensile strengths of the Si-added steel exceeded that of the Si-free steel with the similar ductility *** was because Si was an effective solid solution strengthener,and the austenite in the Si-added steel exhibited the appropriate stability to gradually transform into martensite throughout the *** resulting strengthening effect compensated for the softening caused by martensite ***,strain hardening rate decreased continuously throughout deformation,which resulted in high tensile strength and ductility.

关键词： steels Q&P steel Silicon Austenite stability Tensile deformation Stacking fault energy medium mn steel

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