摘要
对Monel K-500合金对试样进行了时效处理,让其析出大量碳化物。使用Gleeble-3800热模拟机对Monel K-500合金试样进行了高温压缩试验,研究了该合金在变形温度850~1150℃,应变速率0.01~10 s^（-1）时的流动应力行为。建立了该合金的热压缩本构方程。根据试验数据建立了真应变0.8的热加工图。使用光学显微镜进行了组织分析,确定了合金压缩变形的加工＂安全区＂和＂失稳区＂。结果表明：在变形温度850℃、应变速率0.1 s^（-1）时合金开始动态再结晶;合金的热变形激活能为375.32611 k J/mol。合理的热加工参数是：应变速率0.1~0.5 s^（-1）、变形温度1000~1150℃。此时耗散功率在40%左右,再结晶充分,组织细小、均匀。
The Monel K-500 alloy samples were aged and a large amount of carbides precipitated.The high temperature compression experiments of Monel K-500 alloy sample were carried out by using Gleeble-3800 thermal simulation machine.Flow stress behavior of the alloy was investigated at deformation temperature of 850-1150℃and strain rate of 0.01-10 s^（-1）.The hot compression constitutive equation was established.The hot processing map of the alloy at strain of 0.8 was constructed based on the experiment data.The microstructure was analyzed by using the optical microscope,and＂safety zone＂and＂instability zone＂in the compression deformation processing of the alloy were determined.The results show that the dynamic recrystallization of the alloy begins at deformation temperature of 850℃and strain rate of 0.1 s^（-1）;hot deformation activation energy of the alloy is 375.32611 k J/mol.The reasonable thermal processing parameters are strain rate of 0.1-0.5 s^（-1）and deformation temperature of 1000-1150℃.Under this parameters,the dissipation power is about 40%,the recrystallization is sufficient,and the microstructure is fine and uniform.
作者
俞年年
项金钟
郑文杰
YU Niannian;XIANG Jinzhong;ZHENG Wenjie(College of Material Science of Engineering, Yunan Universitiy,Kunming 650091, China;Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China)
出处
《热加工工艺》
CSCD
北大核心
2018年第7期172-176,180,共6页
Hot Working Technology
