低碳钢Q&P过程中C、Si、Mn的配分动力学研究  

Partition kinetics of C,Si,Mn in low-carbon steel during Q&P process

作　　者：陈飞[1,2] 徐耀文 李震[3] 杨庚蔚 赵刚[1,2] Chen Fei;Xu Yaowen;Li Zhen;Yang Gengwei;Zhao Gang(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;College of Materials Science and Metallurgical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]武汉科技大学材料与冶金学院,湖北武汉430081 [3]大连理工大学机械工程学院,辽宁大连116024

出　　处：《武汉科技大学学报》2022年第5期321-328,共8页Journal of Wuhan University of Science and Technology

基　　金：国家重点研发计划资助项目(2021YFB3702402);湖北省技术创新专项重大项目(2017AAA113).

摘　　要：在限制C平衡(constrained carbon equilibrium,CCE)条件下,采用有限单元法建立配分动力学计算模型,对低碳钢Q&P过程中C、Si、Mn元素的配分行为进行数值计算,结合电子探针微区分析技术(EPMA),研究了低碳钢经Q&P工艺热处理后组织中C、Si、Mn元素的分布情况。结果表明,350、450℃温度下,C在30~120 s内完成配分,并且在较短时间内发生微米级的长程扩散;当温度降至250℃,C完成配分时间延长至10 h。在250、350、450℃温度下配分30 d,Si在钢奥氏体/马氏体界面处的马氏体侧富集,而Mn则会在奥氏体侧发生富集,Si和Mn的有效扩散距离分别为4.5、1.5 nm。Under the condition of constrained carbon equilibrium(CCE),the finite element method was used to establish a partition kinetics calculation model,and the partition behavior of C,Si and Mn elements in low carbon steel during Q&P process was numerically calculated.The distribution of C,Si and Mn elements in the steel after heat treatment by Q&P process was studied by electron probe micro-area analysis(EPMA).The results show that at 350℃and 450℃,C completes the partitioning within 30~120 s,and micron-scale long-range diffusion occurs within a relatively short time;when the temperature drops to 250℃,partitioning completed by C takes as long as 10 h.When partitioning at 250,350 and 450℃for 30 days,Si is enriched on the martensite side at the austenite/martensite interface of the steel,while Mn is enriched on the austenite side.The effective diffusion distances are 4.5 nm and 1.5 nm,respectively.

关 键 词：Q&P钢 元素配分 配分动力学 EPMA 元素扩散 

分 类 号：TG156.3[金属学及工艺—热处理]