【摘 要】
:
在Gleeble-1500D热模拟试验机上对镍基高温合金GH4133B进行变形温度为940~1060?℃,应变速率为0.001~1?s?1,变形量为50%的热模拟压缩实验,并对不同工艺参数下的变形试样进行微观组织观察.结合Arrhenius双曲正弦型方程并引入Zener-Hollomon参数,构建该合金热变形的本构模型,绘制热加工图.获得该合金的热变形激活能为448?kJ/mol,在温度为1020?℃,应变速率为1?s?1时,功率耗散达到峰值.基于本构模型的建立和热加工图的绘制等热模拟压缩研究结果和微观组
【机 构】
:
陕西科技大学 机电工程学院,西安 710021;陕西科技大学 机电工程学院,西安 710021;西北工业大学 材料学院,西安 710072;浙江温州轻工研究院,浙江温州 325019
论文部分内容阅读
在Gleeble-1500D热模拟试验机上对镍基高温合金GH4133B进行变形温度为940~1060?℃,应变速率为0.001~1?s?1,变形量为50%的热模拟压缩实验,并对不同工艺参数下的变形试样进行微观组织观察.结合Arrhenius双曲正弦型方程并引入Zener-Hollomon参数,构建该合金热变形的本构模型,绘制热加工图.获得该合金的热变形激活能为448?kJ/mol,在温度为1020?℃,应变速率为1?s?1时,功率耗散达到峰值.基于本构模型的建立和热加工图的绘制等热模拟压缩研究结果和微观组织测试结果,确定GH4133B镍基高温合金最佳的热加工变形温度和应变速率分别为1020~1060?℃和0.01~0.1?s?1.
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