【作者】 丛炳鑫； 许哲峰； 张林峰； 毛佳伟； 郑春雷； 王天生； 于金库； 本塚智； 松木一弘；

【Author】 Cong Bingxin;Xu Zhefeng;Zhang Linfeng;Mao Jiawei;Zheng Chunlei;Wang Tiansheng;Yu Jinku;Motozuka Satoshi;Kazuhiro Matsugi;State Key Lab of Metastable Materials Science &Technology,Yanshan University;Hebei Key Lab for Optimizing Metal Product Technology and Performance,YanshanUniversity;Scientific Research Division,Advanced Department of Science and Engineering,Hiroshima University;Department of Materials Science and Engineering,Kyushu Institute of Technology;

【机构】 燕山大学亚稳材料制备技术与科学国家重点实验室； 燕山大学河北省金属产品工艺与性能综合优化实验室； 广岛大学先进理工系； 九州工业大学大学院工学研究院；

【摘要】 临界退火工艺是提高中锰钢力学性能的关键,因为在此过程中轧制马氏体或铁素体转变为奥氏体,其中一些稳定性较强的奥氏体晶粒可在室温下保留,而Mn含量又可以很好的为奥氏体提供稳定性,因为临界退火过程中析出的Mn原子会为奥氏体形核长大提供动力,从而增强奥氏体的化学稳定性。本研究对具有轧制马氏体组织的Fe-8Mn-4Ni-3Al-1Cr-0.1C中锰钢进行了施加压力的临界退火处理,使逆转变奥氏体在临界退火温度上保温时在马氏体晶界处形成形核并长大,最终得到了多尺度多相层状结构。结果表明:在655℃经过临界退火处理后的中锰钢,随退火时间的增加,材料的强塑积呈现出增加的趋势。在临界退火处理60min后的中锰钢显示了最高的强塑积,其极限抗拉强度和断裂应变分别为,1130 MPa、23%。更多还原

【Abstract】 The critical annealing process is the key to improve the mechanical properties of medium manganese steel,because in this process,the rolled martensite or ferrite is transformed into austenite,some of the more stable austenite grains can be retained at room temperature,and the Mn content can provide good stability for austenite,because the Mn atoms precipitated during the critical annealing process will provide power for the nucleation and growth of austenite,thereby enhancing the chemical stability of austenite. In this study,Fe-8Mn-4Ni-3Al-1Cr-0.1C medium manganese steel with rolled martensite structure was subjected to critical annealing treatment under pressure,so that the reversed austenite formed nucleation and growth at the grain boundary of martensite when held at the critical annealing temperature,and finally a multi-scale multi-phase layered structure was obtained. The results show that the product of strength and elongation of medium manganese steel after critical annealing at 655 °C increases with the increase of annealing time. The medium manganese steel after critical annealing treatment for 60 min showed the highest product of strength and plasticity,and its ultimate tensile strength,fracture strain and product of strength and plasticity were 1130 MPa,18 % and 20.4 GPa %,respectively.更多还原