金属热处理 ›› 2023, Vol. 48 ›› Issue (11): 22-28.DOI: 10.13251/j.issn.0254-6051.2023.11.004

• 材料研究 • 上一篇    下一篇

耐热钢2Cr12Ni4Mo3VNbN的热变形行为

唐珲1,2, 涂露寒1, 黎颖1, 吴志伟1, 周志明2, 张军1   

  1. 1.成都先进金属材料产业技术研究院股份有限公司, 四川 成都 610300;
    2.重庆理工大学 材料科学与工程学院, 重庆 400054
  • 收稿日期:2023-06-20 修回日期:2023-09-04 出版日期:2023-11-25 发布日期:2023-12-27
  • 通讯作者: 张 军,高级工程师,博士,E-mail:jzhangj@mail.ustc.edu.cn
  • 作者简介:唐 珲(1996—),男,硕士,主要研究方向为马氏体耐热钢的热处理等, E-mail:uftisxmac@163.com。
  • 基金资助:
    第七届中国科协青年人才托举工程项目

Hot deformation behavior of heat-resistant steel 2Cr12Ni4Mo3VNbN

Tang Hui1,2, Tu Luhan1, Li Ying1, Wu Zhiwei1, Zhou Zhiming2, Zhang Jun1   

  1. 1. Chengdu Advanced Metal Material Industry Technology Research Institute Co., Ltd., Chengdu Sichuan 610300, China;
    2. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
  • Received:2023-06-20 Revised:2023-09-04 Online:2023-11-25 Published:2023-12-27

摘要: 采用Gleeble-3500热模拟试验机,研究了耐热钢2Cr12Ni4Mo3VNbN在变形温度为900~1200 ℃、应变速率为0.01~1 s-1、变形量为0.5条件下的热压缩变形行为和微观组织演化规律。基于真应力-真应变曲线分析不同变形温度和应变速率对试验钢热变形行为的影响,采用 Arrhenius 双曲正弦方程构建耐热钢2Cr12Ni4Mo3VNbN的流变应力本构模型,并结合动态材料模型(DMM)绘制了热加工图。结果表明,流变峰值应力随变形温度升高或应变速率下降而降低,在应变速率为0.1 s-1时,变形温度达到1000 ℃后开始出现再结晶,且随变形温度升高再结晶晶粒越大;在不同温度下组织中均发现有δ铁素体,其含量随温度升高而增加。结合热加工图和微观组织分析,确定了耐热钢2Cr12Ni4Mo3VNbN的最佳热加工区域为1068~1172 ℃, 0.08~0.12 s-1

关键词: 2Cr12Ni4Mo3VNbN耐热钢, 热变形行为, 微观组织

Abstract: Hot compression deformation behavior and microstructure evolution of heat-resistant steel 2Cr12Ni4Mo3VNbN were studied by Gleeble-3500 thermal simulation test machine under the conditions of deformation temperature of 900-1200 ℃, strain rate of 0.01-1 s-1 and deformation amount of 0.5. Based on the true stress-true strain curves, the effects of different deformation temperatures and strain rates on the hot deformation behavior of the tested steel were analyzed. The flow stress constitutive model of the tested steel was constructed by Arrhenius hyperbolic sine equation, and the hot processing map was drawn by combining with the dynamic material model (DMM). The results indicate that the peak flow stress decreases with the increase of temperature or the decrease of strain rate. As the strain rate is 0.1 s-1, the dynamic recrystallization occurs when the deformation temperature reaches 1000 ℃, and the size of dynamic recrystallized grain increases with the increase of deformation temperature. Additionally, δ ferrite is found in the microstructure at different deformation temperatures, and its content increases with the increase of temperature. Combined with the hot processing map and microstructure evolution, the optimal hot working process of the heat-resistant steel 2Cr12Ni4Mo3VNbN is determined as 1068-1172 ℃, 0.08-0.12 s-1.

Key words: 2Cr12Ni4Mo3VNbN heat-resistant steel, hot deformation behavior, microstructure

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