摘要
采用Gleeble-1500D数控动态热力模拟试验机,对C17200(Cu-1.9Be-0.3Co)合金进行了热压缩试验,研究了该合金在变形温度为600、650、700、750和800℃,应变速率为0.01、0.1、1、5和10 s-1,总压缩应变量为50%条件下的热变形行为。结果表明:合金的峰值应力随应变速率的增加和温度的降低而升高,C17200合金为热(负温度)敏感型和正应变速率敏感型合金,应变速率为1 s-1、5 s-1和10 s-1时,合金软化机制以动态回复为主,应变速率为0.01 s-1和0.1 s-1时,合金软化机制以动态再结晶为主,且高温低应变速率有利于促进合金发生动态再结晶;基于Arrhenius双曲正弦本构关系得到了C17200合金的峰值流变应力本构方程;基于MATLAB平台编程构建了应变量为0.1~0.6时C17200合金的热加工图,在实验范围内获得安全加工区的热加工工艺参数区间为:变形温度750~800℃,应变量0.4~0.6,应变速率0.1~0.2 s-1。
Hot compression experiment of C17200(Cu-1.9 Be-0.3 Co)alloy was carried out by Gleeble 1500 D digital controlled dynamic thermomechanical simulation machine. The hot deformation behavior of the C17200 alloy under the conditions of deformation temperature of 600, 650, 700, 750 and 800 ℃, strain rate of 0.01, 0.1, 1, 5 and 10 s-1 and total compression strain of 50% was studied. The results show that the peak stress of the alloy increases with the decrease of temperature and the increase of the strain rate. The C17200 alloy is negative temperature and positive strain rate sensitive alloy. When the strain rate is 1 s-1, 5 s-1, and 10 s-1, the softening mechanism of the alloy is mainly dynamic recovery;when the strain rate is 0.01 s-1 and 0.1 s-1, the softening mechanism is mainly the dynamic recrystallization, and high temperature and low strain rate are beneficial to dynamic recrystallization. The peak flow stress constitutive equation of the C17200 alloy is obtained based on Arrhenius hyperbolic sinusoidal constitutive relation, the hot processing map of the C17200 alloy at the strain range of 0.1-0.6 is constructed based on MATLAB platform programming. The range of hot processing parameters in safe processing zone are:deformation temperature of 750-800 ℃, strain of 0.4-0.6 and strain rate of 0.1-0.2 s-1.
作者
康军伟
周延军
刘海涛
宋克兴
张勇
孔令宝
吕官丽
岳丽娟
KANG Jun-wei;ZHOU Yan-jun;LIU Hai-tao;SONG Ke-xing;ZHANG Yong;KONG Ling-bao;LU Guan-li;YUE Li-juan(Institute of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-construction Collaborative Innovation Center of New Materials and Advanced Processing Technology of Nonferrous Metals,Luoyang 471023,China;Northwest Rare Metal Materials Research Institute Ningxia Co Ltd,Shizuishan 753000,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2020年第10期130-136,共7页
Transactions of Materials and Heat Treatment
基金
河南省创新引领专项(191110210400)
河南省高等学校重点科研项目(19A430012)
河南省杰出人才创新基金(182101510003)。
