挤压态FGH4096合金室温变形及临界晶粒长大研究  

Study on Room Temperature Deformation and Critical Grain Growth for Extruded FGH4096 Alloy

作　　者：刘松浩 司家勇[1] 陈龙[1] LIU Songhao;SI Jiayong;CHEN Long(College of Mechanical and Electrical Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]中南林业科技大学机电工程学院,长沙410004

出　　处：《材料导报》2021年第14期14107-14114,共8页Materials Reports

基　　金：湖南省教育厅重点研究项目(16A220);湖南省自然科学基金面上项目(2017JJ2403);湖南省高校科技创新团队支持计划项目(2014207);中南林业科技大学研究生科技创新基金(CX20192078)。

摘　　要：基于挤压态FGH4096合金圆柱和双圆锥台试样室温压缩变形及热处理实验,结合DEFORM有限元软件数值模拟,确定了挤压态FGH4096合金室温压缩临界晶粒长大的临界等效应变窗口条件,分析了挤压态FGH4096合金室温压缩临界晶粒长大机制。结果表明:挤压态FGH4096合金圆柱试样在压缩速度0.01 mm/s下的室温压缩临界等效应变窗口为0.03~0.07,双圆锥台试样在压缩速度0.05 mm/s下的室温压缩临界等效应变窗口为0.005~0.06。挤压态FGH4096合金室温压缩临界晶粒长大与合金变形量和γ′相溶解后晶界的颗粒钉扎作用消失有关,呈现为在小变形区域粗大晶粒吞噬细小晶粒的异常晶粒特征。Based on the compression deformation at room temperature and heat treatment of extruded FGH4096 alloy cylinder and double-cone specimens,with the DEFORM numerical simulation,the critical equivalent strain window condition of critical grain growth(CGG)at room temperature compression for extruded FGH4096 alloy was determined,and the mechanism of critical grain growth at room temperature compression for extruded FGH4096 alloy was analyzed.The results show that the critical equivalent strain window condition at room temperature compression at the compression speed of 0.01 mm/s for extruded FGH4096 alloy is 0.03—0.07,and it is 0.005—0.06 at the compression speed of 0.05 mm/s.The critical grain growth of room temperature deformation for extruded FGH4096 alloy is related to the degree of grain deformation and the disappearance of Zener pinning at grain boundary after γ′phase dissolution,and it is shown as the abnormal grain character of coarse grain consuming fine grain in the small deformation region.

关 键 词：FGH4096合金 挤压态 室温压缩 热处理 临界晶粒长大 

分 类 号：V256[一般工业技术—材料科学与工程]