新型Ni-Cr-Co-Mo合金热压缩变形行为  

Hot Compression Deformation Behavior of New Type Ni-Cr-Co-Mo Alloy

作　　者：李波[1,2] 王文浩[2] 陈从平[1,2] 吴海华[1,2] 叶喜葱[1,2] 孙宇[3] 

机构地区：[1]三峡大学水电机械设备设计与维护湖北省重点实验室,湖北宜昌443002 [2]三峡大学机械与动力学院,湖北宜昌443002 [3]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《热加工工艺》2017年第7期55-59,共5页Hot Working Technology

基　　金：湖北省教育厅科学技术研究计划优秀中青年人才资助项目(Q20161202);水电机械设备设计与维护湖北省重点实验室开放基金项目(2016KJX04)

摘　　要：利用Gleeble-3500热模拟试验机进行了高温压缩试验,研究了Ni-Cr-Co-Mo合金在变形温度950~1080℃、应变速率0.01~10 s^(-1)下的热变形行为。基于动态材料模型构建了合金热加工图。结果表明:合金在试验条件下具有正应变速率敏感性。合金的平均热变形激活能为566.758 kJ/mol。当应变为0.4时,合金的流变失稳区域较大,说明该合金在大应变时加工难度很大。在变形温度为1000℃时,随着应变速率降低,动态再结晶更加充分。合金最佳工艺参数为变形温度1000~1050℃、应变速率0.01~0.1 s^(-1)。The high temperature compression test was carried out by using Gleeble-3500 thermal mechanical simulator. The hot deformation behavior of Ni-Cr-Co-Mo alloy at 950-1080 ℃ and strain rate of 0.01-10 s-1 was studied. The alloy hot processing maps were constructed based on the dynamic material model. The results show that the alloy has positive strain rate sensitivity under test conditions. The average thermal deformation activation energy of the alloy is 566.758 kJ/mol. When the strain is 0.4, the flow instability region of the alloy is larger, which indicates that it is difficult to process the alloy in large strain. When the deformation temperature is 1000 ℃, the dynamic recrystallization is fuller with the decrease of strain rate. The optimum technological parameters of the alloy are deformation temperature of 1 110-1150 ℃ and the strain rate of 0.01-0.1 s-1.

关 键 词：Ni-Cr-Co-Mo合金 热激活能 本构方程 热加工图 

分 类 号：TG316[金属学及工艺—金属压力加工]