DP-GH4169合金在热变形中片层状δ相的球化行为及动力学模型  

Spheroidization Behavior and Kinetic Model of Plate-LikeδPhase of DP-GH4169 Alloy During Hot Deformation

作　　者：张海燕[1] 程明[2] 胡如夫[1] 张士宏[2] 赵忠[1] Zhang Haiyan;Cheng Ming;Hu Rufu;Zhang Shihong;Zhao Zhong(School of Mechanical and Automotive Engineering,Ningbo University of Technology,Ningbo 315336,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]宁波工程学院机械与汽车工程学院,浙江宁波315336 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2023年第11期3778-3784,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51505240);浙江省零件轧制成形技术研究重点实验室项目(PR20002)。

摘　　要：通过OM、TEM和热模拟压缩实验等分析测试方法,对DP-GH4169合金在热变形过程中片层状δ相的球化行为及动力学模型进行了研究。结果表明:片层状δ相的溶解行为主要为Nb原子由δ/γ相界到达基体γ的长程扩散控制;在热变形过程中,溶解对于片层状δ相的球化行为影响较小,片层状δ相的临界球化应变εc取决于变形温度和应变速率;在热模拟压缩实验范围内,片层状δ相的临界球化应变εc为0.04~0.10,且随着变形温度升高和应变速率降低而减小;热变形中片层状δ相的球化体积分数与热变形参数之间满足Avrami方程。The spheroidization behavior and kinetic model of plate-likeδphase of DP-GH4169 alloy during hot deformation were investigated by OM,TEM and isothermal compression tests.The results show that the dissolved behavior of plate-likeδphase is mainly controlled by the diffusion of Nb fromδ/γphase boundaries to matrixγ.In the process of hot deformation,the dissolving has little effect on the spheroidization behavior of plate-likeδphase.The spheroidization critical strainεc of plate-likeδphase depends on the deformation temperature and strain rate.The spheroidization critical strainεc of plate-likeδphase is from 0.04 to 0.10 in the isothermal compression tests,and it decreases with the deformation temperature increasing or the strain rate decreasing.The relationship between the spheroidized volume fraction of plate-likeδphase and the thermal deformation parameters is in accord with the Avrami equation.

关 键 词：GH4169合金 热变形 片层状δ相 球化 动力学模型 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG115.21[金属学及工艺—金属材料]