Ti微合金化汽车大梁钢510L动态再结晶行为  

Dynamic Recrystallization Behaviors of Ti Micro-alloyed 510L Steel for Automobile Frame

作　　者：周晓光[1] 陈其源 刘振宇[1] 吴思炜 ZHOU Xiao-guang;CHEN Qi-yuan;LIU Zhen-yu;WU Si-wei(State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2018年第5期624-629,共6页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2017YFB0305000);辽宁省自然科学基金资助项目(2015020180)

摘　　要：采用单道次压缩实验和阶梯试样热轧-淬火实验研究了低成本的Ti微合金化汽车大梁钢510L的动态再结晶行为.结果表明,应变速率为0.1 s^(-1)时,变形温度为850~1 050℃时均发生动态再结晶,应变速率为0.2 s^(-1)时,只有在变形温度高于950℃时发生动态再结晶.变形温度的升高和变形量的增大会逐渐细化奥氏体晶粒,并使再结晶体积分数趋于增大.回归得到实验钢的动态再结晶激活能仅为211.43 k J/mol,说明Ti的添加几乎没有抑制高温奥氏体的动态再结晶,并建立了动态再结晶临界应变模型和动力学模型.The dynamic recrystallization behaviors of Ti micro-alloyed 510 L steel for automobile frame were investigated using single-pass compression tests and hot-rolling and quenching tests for step samples. The results showthat when the strain rate is 0. 1 s^-1,the dynamic recrystallization can occur at the deformation temperature ranging from 850 to 1 050 ℃; while,when the strain rate is 0. 2 s^-1,it only occurs at the temperature above 950 ℃. With increasing the deformation temperature and strain,the average grain size of the austenite decreases and the volume fraction of recrystallization increases. By regression analysis, the activation energy for dynamic recrystallization in the tested samples is 211. 43 k J/mol,which indicates that the addition of Ti has little effect on dynamic recrystallization behavior of the high-temperature austenite. The critical strain and kinetic models for dynamic recrystallization are also established.

关 键 词：TI微合金化 大梁钢510L 动态再结晶 激活能 数学模型 

分 类 号：TG142.1[一般工业技术—材料科学与工程]