新型Co⁃Ni基高温合金的热变形行为及微观组织演变  

Hot deformation behavior and microstructure evolution of a novel Co⁃Ni⁃based superalloy

作　　者：付志强 何国爱 吴赟杰 贺存孝 Fu Zhiqiang;He Guoai;Wu Yunjie;He Cunxiao(Institute of Light Alloy Research,Central South University,Changsha Hunan 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha Hunan 410083,China;Hunan InnoChina Advanced Materials Co.,Ltd.,Yueyang Hunan 414000,China)

机构地区：[1]中南大学轻合金研究院,湖南长沙410083 [2]中南大学高性能复杂制造国家重点实验室,湖南长沙410083 [3]湖南中创空天新材料股份有限公司,湖南岳阳414000

出　　处：《金属热处理》2024年第2期1-7,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(51901247)。

摘　　要：利用Gleeble⁃3800热模拟试验机对新型Co⁃Ni基高温合金进行热压缩试验,研究其在变形温度为950~1100℃、应变速率为0.01~10 s^(-1)、真应变为0.693时的热变形行为和微观组织演变。结果表明,合金流动应力随变形温度的升高或应变速率的降低而减小。合金平均晶粒尺寸随变形温度的升高而增加,降低变形温度和提高应变速率可细化动态再结晶晶粒。基于EBSD和TEM分析表明,合金热变形过程中非连续动态再结晶(DDRX)作为主要动态再结晶(DRX)机制,孪晶形核作为辅助形核机制。Gleeble⁃3800 thermal simulation testing machine was used to perform hot compression tests on a novel Co⁃Ni⁃based superalloy to study its hot deformation behavior and microstructure evolution at deformation temperature of 950⁃1100℃,strain rate of 0.01⁃10 s^(-1) and true strain of 0.693.The results show that the flow stress of the alloy decreases with the increase of deformation temperature or the decrease of strain rate.The average grain size of the alloy increases with the increase of deformation temperature and the dynamic recrystallization grains can be refined by reducing the deformation temperature and increasing the strain rate.The EBSD and TEM analysis results indicate that the discontinuous dynamic recrystallization(DDRX)is the main dynamic recrystallization(DRX)mechanism and the twin nucleation is the auxiliary nucleation mechanism during the hot deformation of the alloy.

关 键 词：Co⁃Ni基高温合金 热压缩 动态再结晶 孪晶 

分 类 号：TG146.1[一般工业技术—材料科学与工程]