文章摘要
Inconel 625合金高速热变形动态再结晶的临界条件
Critical Conditions of Dynamic Recrystallization during High Speed Hot Deformation of Inconel 625 Alloy
Received:December 05, 2011  Revised:March 10, 2012
DOI：
中文关键词: Inconel 625合金  加工硬化率  动态再结晶  临界应变
英文关键词: Inconel 625 alloy  work hardening rate  dynamic recrystallization  critical strain
基金项目:国家自然科学基金钢铁联合基金重点项目资助（50834008）
Author NameAffiliation
TAO Lin Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 
CHENG Ming Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 
SONG Guang-sheng Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 
ZHANG Shi-hong Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 
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中文摘要:
      通过等温热压缩试验获得Inconel 625合金在变形温度为1000~1200 ℃，应变速率为1~80 s-1条件下的真应力应变曲线，利用加工硬化率，结合 ln θ-ε曲线上的拐点判据及-(ln θ)/ε-ε曲线上的最小值，来研究Inconel 625合金动态再结晶的临界条件。结果表明，在本实验条件下，Inconel 625合金的ln θ-ε曲线均出现拐点特征，对应的-(ln θ)/ε-ε曲线出现最小值，该最小值处对应的应变即为临界应变；临界应变随应变速率的增大和变形温度的降低而增加，并且临界应变和峰值应变之间有一定的关系，即ε-c=0.69ε-p；动态再结晶时临界应变的预测模型可以表示为ε-c=4.41×10-4Z0.142 61 。
英文摘要:
      Hot compression tests of Inconel 625 alloy were conducted at deformation temperature range of 1000~1200 ℃ and strain rates of 1~80 s-1 to obtain true stress-true strain curves. The critical conditions of dynamic recrystallization for Inconel 625 alloy were studied by using the work hardening rate θ, combined with the inflection point criterion of ln θ-ε curves and the minimum value of -(ln θ)/ε-ε curves. The results indicate that the ln θ-ε curve of Inconel 625 alloy presents the inflection point, and a minimum value of -(ln θ)/ε-ε curve appears, which means the critical strain ε-c. The critical strain increases with the strain rate increasing and the temperature decreasing. And there is a relationship between the critical strain ε-c and peak strain ε-p, i.e.ε-c=0.69ε-p. The predicting model of critical strain is described as ε-c=4.41×10-4Z0.142 61 .
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