锻压技术

Cr20Ni80电热合金高温压缩过程中的组织演变

英文标题：Microstructure evolution of Cr20Ni80 electrothermal alloy in

作者：李亚敏龚乃国

单位：兰州理工大学

分类号：

出版年,卷(期):页码：2015,40(1):119-124

摘要：

为了研究电热合金Cr20Ni80在热变形过程中的组织演变规律，在Gleeble-1500D热模拟试验机上对该合金进行了高温压缩试验，并绘制了变形温度为900～1220 ℃、应变速率为0.001～10 s-1条件下合金的真应力-真应变曲线，同时对热变形后的金相组织进行了分析。结果表明：在相同的温度下，流变应力与变形速率正相关；在相同的速率下，流变应力与变形温度反相关；Cr20Ni80合金在高温变形过程中，与应变速率相比其组织演变过程对温度更为敏感。在较高的温度下及低应变速率下，原子有充足的时间和足够的能量进行扩散，利于组织的演变，且能够改善合金内部因锻造而产生的流线分布。

In order to study the microstructure evolution of Cr20Ni80 electrothermal alloy in hot compression process, the high temperature compression tests were carried out by Gleeble-1500D thermal simulation machine, and the true stress-true strain curves were gained under the temperature range of 900-1220 ℃ and the strain rates of 0.001-10 s-1, and finally the microstructure of alloy after hot deformation was analyzed. The results show that the flow stress and strain rate at the same temperature are in positive relation, but the flow stress and deformation temperature under the same rate are in inverse relation. The microstructure evolution of Cr20Ni80 is more sensitive to temperature than strain rate in the process of high temperature deformation. With high temperature and low strain rate, the atom has enough time and energy to spread, which benefits the microstructure evolution and improves the flow line distribution in alloy caused by forging.

基金项目：

甘肃省自然科学基金资助项目(1112RJZA030)

李亚敏(1973-)，女，博士，副教授

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