热挤压态FGH4096镍基粉末高温合金的热变形行为的研究
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- 英文论文题名：Hot Deformation Behavior of Hot Extruded FGH4096 Nickel-base Powder Metallurgy Superalloy
- 论文作者：杨川 ; 刘小涛 ; 司家勇 ; 刘锋 ; 江亮
- 英文论文作者：Yang Chuan ; Liu Xiaotao ; Si Jiayong ; Liu Feng ; Jiang Liang ; School of Aeronautics and Astronautics ; Central South University ; State Key Laboratory of Powder Metallurgy ; Central South University
- 年：2015
- 作者机构：中南大学航空航天学院;中南大学粉末冶金国家重点实验室;
- 论文关键词：镍基粉末高温合金 ; 热挤压工艺 ; 本构方程 ; 热加工性能 ; 宏观裂纹
- 英文论文关键词：Nickel-based P/M superalloys ; hot extrusion ; constitutive equation ; hot workability ; fracture
- 会议召开时间：2015-05-20
- 会议录名称：第十三届中国高温合金年会论文集
- 英文会议录名称：Proceedings of the 13th China Superalloys Conference
- 语种：中文
- 分类号：TG132.3
- 学会代码：ZGJS
- 会议名称：第十三届中国高温合金年会
- 会议地点：中国北京
- 主办单位：中国金属学会高温材料分会
- 学会名称：中国金属学会
- 页数：5
- 文件大小：2414k
- 原文格式：O
- 会议级别：全国
摘要
采用Gleeble 3180D热模拟试验机对热挤压态FGH4096镍基粉末高温合金在变形温度1020~1 140℃,应变速率0.001~1.0s~(-1)的条件下做等温热压缩试验,研究了其高温变形行为。分析了真应力-真应变曲线,并且观察了变形组织。计算出该合金的热变形激活能约为1124.7kJ/mol,相比热等静压态的变形激活能有明显的增加。结果表明:在低于1080℃变形条件下,变形后的试样观察到严重的宏观开裂现象,并造成相应的真应力-真应变曲线明显地下降,微观组织没有明显的动态再结晶发生;当变形温度高于1080℃时,发生了明显的动态再结晶,并在随着应变速率的降低发生了晶粒长大。
The hot deformation behavior of hot extruded FGH4096 Nickel-based superalloy was investigated in the temperature range 1020 ~ 1140℃ and strain rate range 0.001 ~ 1.0 s~(-1) using hot compression tests by Gleeble 3180 D thermal simulation system.The true stress-true strain curve and microstructure observation was analyzed.Hot deformation activation energy was obtained and about 1124.7kJ/mol,which is higher than that of as-HIPed FGH4096.The results show that compressed specimens severely cracked at the deformation temperatures lower than 1080℃,which corresponds to the dramatic dropping of stress curves,and the microstructures are observed without obvious dynamic recrystallization.For the deformation temperatures above 1080℃,the microstructures were found with many fine recrystallized grains,and grains grew up as the decreasing of strain rate.
The hot deformation behavior of hot extruded FGH4096 Nickel-based superalloy was investigated in the temperature range 1020 ~ 1140℃ and strain rate range 0.001 ~ 1.0 s~(-1) using hot compression tests by Gleeble 3180 D thermal simulation system.The true stress-true strain curve and microstructure observation was analyzed.Hot deformation activation energy was obtained and about 1124.7kJ/mol,which is higher than that of as-HIPed FGH4096.The results show that compressed specimens severely cracked at the deformation temperatures lower than 1080℃,which corresponds to the dramatic dropping of stress curves,and the microstructures are observed without obvious dynamic recrystallization.For the deformation temperatures above 1080℃,the microstructures were found with many fine recrystallized grains,and grains grew up as the decreasing of strain rate.
引文
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[4]王岩.8相对GH4169合金高温变形及再结晶行为的影响[D].哈尔滨:哈尔滨工业大学,2008.
[5]Xu W,et al.Hot compressive deformation behavior and microstructure evolution of HIPed FGH4096 superalloy[J].Transactions of Nonferrous Metals Society of China.2012(22):66~71.