中温中压容器用钢13MnNiMoR的热变形行为研究  

Hot deformation behavior of 13MnNiMoR pressure vessel steel

作　　者：方磊 霍松波 张春丽 李兴[2] 陈洁 赵阳 Fang Lei;Huo Songbo;Zhang Chunli;Li Xing;Chen Jie;Zhao Yang(Plate Steel Business Division,Nanjing Iron and Steel Co. Ltd ,Nanjing 210035,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]南京钢铁股份有限公司板材事业部,南京210035 [2]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819 [3]东北大学材料科学与工程学院,沈阳110819

出　　处：《材料与冶金学报》2017年第4期281-285,共5页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助项目(51501031);中央高校基本科研业务费(N140203001)

摘　　要：为制定中温中压容器用钢13MnNiMoR的热加工工艺提供理论依据并实现其工业化生产,利用单道次热压缩模拟实验研究了变形温度(900~1150℃)和应变速率(0.01~1s^(-1))对其热变形行为的影响.结果表明:当应变速率低于0.1s^(-1)时,新晶粒有足够的时间进行形核和长大,奥氏体容易发生动态再结晶;当变形温度降低或应变速率增加时,实验钢在变形过程中主要发生动态回复,流变应力也随之提高.基于测定的流变应力曲线,通过拟合得到实验钢在热变形时的应力指数为4.29,动态再结晶激活能为319kJ/mol,据此建立了13MnNiMoR钢在高温变形时的热加工方程.In order to provide a theoretical basis for hot working technologies,the hot deformation behavior of13MnNiMoR pressure vessel steel was studied by a single-pass compressive deformation test at elevated temperatures to explore effects of deformation temperature(950~1150℃)and strain rate(001~1s-1)on deformation.The results showed that dynamic recrystallization is easy to occur in austenite when strain rate is lower than01s-1because a new austenite has enough time to nucleate and grow.The main softening mechanism of this steel changes from dynamic recrystallization to dynamic recovery with decreasing temperature and increasing strain rate.Through data fitting,the stress exponent and activation energy for dynamic recrystallization were determined to be429and319kJ/mol.Finally,the hot working equation of13MnNiMoR steel was established on the basis of compressive flow stress curves.

关 键 词：13MnNiMoR钢 压力容器用钢 热变形 动态再结晶 激活能 

分 类 号：TG335.3[金属学及工艺—金属压力加工]