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Effect of V and V-N Microalloying on Deformation-Induced Ferrite Transformation in Low Carbon Steels

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Journal of materials Science & Technology 2006年第2期22卷 159-163页

作者： Kai wang lijun wang wenfang cui chunming liu sch.ol of materials and met.llurgy Northeastern University Shenyang 110004 China

Deformation-induced ferrite transformation （DIFT） has been proved to be an effective approach to refine ferrite grains. This paper shows that the ferrite grains can further be refined through combination of DIFT and V or V-N microalloying. Vanadium dissolved in γ matrix restrains DIFT. During deformation, vanadium carbonitrides rapidly precipitate due to strain-induced precipitation, which causes decrease in vanadium dissolved in matrix and indirectly accelerates DIFT. Under heavy deformation, deformation induced ferrite （DIF） grains in V microalloyed steel were finer than those in V free steel. The more V added to steel, the finer DIF grains obtained. Moreover, the addition of N to V microalloyed steels can remarkably accelerate precipitation of V, and then promote DIFT. However, DIF grains in V-N microalloyed steel easily coarsen.

关键词： Deformation induced ferrite transformation Strain induced precipitation V microalloyed steel V-N microalloyed steel Thermomechanical simulation

Precipitation Behavior in Fe-18Cr-18Mn-0.43N High-Nitrogen Austenitic Stainless Steel

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Precipitation Behavior in Fe-18Cr-18Mn-0.43N High-Nitrogen A...

Hierarchical strain band formation and mechanical behavior of a heterostructured dual-phase material

高氮钢国际会议

作者： shi feng wang lijun li Huabing Jiang Zhouhua li Zhenbo wang feng liu chunming (sch.ol of materials & met.llurgy northeastern university shenyang 110004 china)

＜正＞The precipitation behavior of Fe-18Cr-18Mn-0. 43N （mass%） high-nitrogen austenitic stainless steel during isothermal aging at 800℃ was investigated using optical microscopy （OM）, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. The isothermal aging treatments lead to the decomposition of nitrogen-supersaturated austenite by discontinuous cellular precipitation of M2N, which was determined to possess a hexagonal structure with the lattice parameters of α= 0.4752 nm and c = 0.4429 nm respectively. The orientation relationship between M2N precipitate and austenitic matrix was [0110]M2N//[101]γ, （2110）M2N//（010）γ,and the chemical composition of M2N precipitate was determined to be （Cr0.61 Fe0.24 Mn0.15）2N. Besides M2N precipitate, some granular-shaped M23C6 precipitates on grain boundaries and hook-like ones inside grains were also observed. The M23C6 precipitates were determined to possess an foc structure with the lattice parameter of α=1.065 nm. A cube-on-cube orientation relationship exists between M23C6 precipitate and austenitic matrix, and the chemical composition of M23C6 precipitate was determined to be （Cr0.59 Fe0.25 Mn0.16）23C6.

关键词： high nitrogen austenitic stainless steel precipitation isothermal aging M2N M23C6

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cnki会议

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Journal of materials Science & Technology 2023年第31期162卷 25-37页

作者： Zhongkai li Yujie liu Yanfei wang Jun Hu Lei Xu Jianjun wang chunming liu Yuntian Zhu Key Laboratory for Anisotropy and Texture of materials of Ministry of Education Northeastern UniversityShenyang 110819China Department of Mechanics and Engineering Science College of EngineeringPeking UniversityBeijing 100871China The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China shi-Changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of materials Science and Engineering City University of Hong KongHong KongChina

Dispersive strain bands have been reported as a characteristic deformation feature of heterostructured materials,which helps to improve ***,their formation mechanism is still not well *** we report the formation of dispersed strain bands through dual-level hierarchical strain banding and its effect on the mechanical behavior of a heterostructured Fe-40Cu model ***,deformation started by the formation and propagation of dispersed microscale strain bands in the heterostructured Fe-40Cu *** strain gradient was generated within the microscale strain bands during their propagation and was accommodated by the accumulation of geometrically necessary disloca-tions(GNDs).The dispersed microscale strain bands were not uniformly distributed,but instead grouped together to form macroscale strain bands that were uniformly distributed over the entire gage section to accommodate the majority of the applied *** formation of this dual-level hierarchical strain bands prevented the formation of large strain localization to fail the sample *** was also found that increasing the strain hardening capacity of soft copper zones provides more room for the accumulation of GNDs,resulting in higher constraint to microscale strain band propagation and consequently higher *** observations suggest the possibility of tailoring microscale strain bands to optimize tensile performance of heterostructured materials.

关键词： Heterostructured materials Strain bands Strain gradient Hetero-deformation induced hardening

Nb对钠冷快堆包壳用15-15Ti奥氏体不锈钢组织和拉伸性能的影响

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稀有金属材料与工程 2021年第11期50卷 4079-4088页

作者：乔羽飞陈思含任媛媛梁田刘春明马颖澈刘奎东北大学材料科学与工程学院辽宁沈阳110819 中国科学院金属研究所师昌绪先进材料创新中心辽宁沈阳110016 中国原子能科学研究院北京102413

使用OM、SEM和TEM等方法研究了质量分数0%,0.21%,0.46%Nb对固溶态和时效态15Cr-15Ni含Ti奥氏体不锈钢(15-15Ti)中析出相类型、形貌及其分布的影响。结果表明,Nb取代了(Ti,Mo)C相中部分Ti、Mo原子,在0.21%Nb和0.46%Nb合金中形成富Nb的(Nb... 详细信息

使用OM、SEM和TEM等方法研究了质量分数0%,0.21%,0.46%Nb对固溶态和时效态15Cr-15Ni含Ti奥氏体不锈钢(15-15Ti)中析出相类型、形貌及其分布的影响。结果表明,Nb取代了(Ti,Mo)C相中部分Ti、Mo原子,在0.21%Nb和0.46%Nb合金中形成富Nb的(Nb,Ti)C相,而且Nb含量的增加使固溶态的奥氏体基体组织细化。在850℃时效1000 h后,组织中有Sigma相、MC碳化物析出,Nb的增加促进了Nb、Mo元素在Sigma相中的富集,促使Sigma相更为细小、弥散析出。固溶态和时效态试样的室温、650℃拉伸结果表明,在0%,0.21%,0.46%Nb范围内,Nb含量的增加对固溶态合金室温和高温拉伸性能影响较小,而Nb促进析出的Sigma相对时效态合金的拉伸性能影响较小。

关键词：钠冷快堆包壳材料奥氏体不锈钢 Sigma相拉伸性能

MnNiCoCrFe多孔高熵合金的电催化析氧性能

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材料研究学报 2023年第5期37卷 332-340页

作者：李海龙牟娟王媛媛葛绍璠刘春明张海峰朱正旺东北大学材料科学与工程学院沈阳110819 中国科学院金属研究所师昌绪先进材料创新中心沈阳110016 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳110016

用化学腐蚀方法制备出3D多孔自支撑型Mn_(50)Fe_(12.5)Co_(12.5)Ni_(12.5)Cr_(12.5)高熵合金。电化学测试结果表明,将这种高熵合金放入1 mol/L KOH的碱性溶液中,电流密度为10 mA·cm^(-2)时过电位为281 mV,Tafel斜率为63 mV/dec,表明其... 详细信息

用化学腐蚀方法制备出3D多孔自支撑型Mn_(50)Fe_(12.5)Co_(12.5)Ni_(12.5)Cr_(12.5)高熵合金。电化学测试结果表明,将这种高熵合金放入1 mol/L KOH的碱性溶液中,电流密度为10 mA·cm^(-2)时过电位为281 mV,Tafel斜率为63 mV/dec,表明其电催化性能优于商业RuO2的性能。在电流密度为50 mA·cm^(-2)的条件下连续工作50 h,工作电压没有明显的升高,表明这种富锰高熵电催化电极材料具有优异的析氧稳定性。电化学阻抗谱表明,这种自支撑型结构的块体高熵合金催化剂具有出色的导电性,与负载型催化剂相比其电子转移能力显著提高。

关键词：金属材料电催化剂高熵合金析氧反应多孔结构