新型节镍奥氏体耐热钢的亚动态再结晶行为-中南大学学报.PDF

第 47 卷第 12 期 中南大学学报( 自然科学版) Vol.47 No.12 2016 年 12 月 Journal of Central South University (Science and Technology) Dec. 2016 DOI: 10.11817/j.issn.1672-7207.2016.12.005 新型节镍奥氏体耐热钢的亚动态再结晶行为 陈雷，龙红军，王建峰，毛天桥，李飞，张英杰 (燕山大学 国家冷轧板带装备及工艺工程技术研究中心，河北 秦皇岛，066004) 摘要：在 Gleeble−3800 热模拟试验机上利用双道次热压缩实验，研究新型节镍奥氏体耐热不锈钢 21Cr-11Ni-N-RE 在变形温度 950~1 150 ℃、应变速率 0.1~10 s−1，道次间保温时间为 0.5~30 s 的亚动态再结晶行为。建立亚动态再 结晶的动力学模型，并将预测值与试验值进行比较。研究结果表明：试验钢易发生亚动态再结晶，随着道次间保 温时间的延长、应变速率的增大和变形温度的升高，材料亚动态再结晶体积分数迅速增大；预应变超过峰值应变 后，应变继续增大对亚动态再结晶体积分数的影响十分有限。21Cr-11Ni-N-RE 耐热不锈钢的亚动态再结晶激活能 Qmdrx 为 130.417 kJ/mol，模型预测值与试验值吻合较好。 关键词：新型节镍奥氏体耐热不锈钢；亚动态再结晶；双道次热压缩；动力学模型 中图分类号：TG142.73 文献标志码：A 文章编号：1672−7207(2016)12−3995−06 Metadynamic recrystallization behavior of a novel austenite heat resistant stainless steel CHEN Lei, LONG Hongjun, WANG Jianfeng, MAO Tianqiao, LI Fei, ZHANG Yingjie (National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China) Abstract: The metadynamic recrystallization(MDRX) behavior of a novel 21Cr-11Ni-N-RE austenite heat resistant stainless steel was studied by Gleeble−3800 thermal simulation testing machine, and using double hit compression experiments at temperature of 950~1 150 ℃, strain rate of 0.1~10 s−1 and inter-pass time of 0.5~30 s. According to the present experimental results, the kinetic equation for the MDRX of 21Cr-11Ni-N-RE austenite heat resistant stainless steel was proposed. Comparison between the experimental