摘要
对GH4720Li镍基沉淀强化型合金进行热压缩实验,并对不同工艺参数下的流动应力进行摩擦与绝热温度修正,分析热变形过程中绝热升温效应和模具与试样间摩擦作用对材料流动应力的影响。结果表明:摩擦修正系数与热变形温度及应变速率有关,且试样在1120℃变形时,摩擦修正系数在各应变速率下均较低。绝热温度修正系数与热变形应变速率及应变有关,当热变形速率低于1 s^-1时,材料的绝热升温效应可忽略不计。通过分析经摩擦与温度修正后的流动应力可知,降低应变速率及升高变形温度,材料的流动软化应力σp-σ0.8(σp为峰值应力,σ0.8为应变为0.8时的应力)逐渐降低。
The hot compression test was conducted on GH4720 Li Ni-based precipitation-strengthening alloy,and the friction and adiabatic temperature were corrected for the flow stress under different process parameters,and the influences of adiabatic heating effect and friction between mould and specimen on material flow stress during hot deformation were analyzed. The results show that the friction correction coefficient is related to the hot deformation temperature and strain rate,and the friction correction coefficient is low at each strain rate when the specimen is deformed at 1120 ℃. The adiabatic temperature correction coefficient is related to the strain rate and strain of hot deformation,when the hot deformation rate is lower than 1 s^-1,the adiabatic heating effect of the material can be ignored. By analyzing the flow stress modified by friction and temperature correction,it is found that the flow softening stress σp-σ0. 8( σpis peak stress,σ0. 8 is stress at strain of 0. 8) decreases gradually when the strain rate is decreases and the deformation temperature is increases.
作者
万志鹏
王涛
李钊
李佩桓
张勇
孙宇
胡连喜
WAN Zhi-peng;WANG Tao;LI Zhao;LI Pei-huan;ZHANG Yong;SUN Yu;HU Lian-xi(Science and Technology on Advanced High Temperature Structural Materials Laboratory,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第8期166-171,共6页
Journal of Plasticity Engineering
作者简介
第一作者/通信作者:万志鹏,男,1991年生,博士,工程师,主要从事变形高温合金及金属间化合物材料研制与应用研究,E-mail:waynedapeng@163.com。
