第4卷第2期 2012年3月 精密成形工稈 JOURNAL OF NETSHAPE FORMING ENGINEERING 第4卷第2期 2012年3月 精密成形工稈 JOURNAL OF NETSHAPE FORMING ENGINEERING 第4卷第2期 2012年3月 精密成形工稈 JOURNAL OF NETSHAPE FORMING ENGINEERING Inconel 625合金高速热变形动态再结晶的临界条件 陶琳,程明,宋广胜,张士宏 (中国科学院金属研究所,沈阳110016) 摘要:通过等温热压缩试验获得Inconel 625合金在变形温度为1000〜1 200 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In 曲线上的拐点判据及一 0(ln 0)/3re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,在该实验条件下Jnconel 625合金的In仇 曲线均出现拐点待征,对应的一a(ln 0)/d^e曲线出现说小值,该最小值处对应的应变即为临界应变;临界应 变随应变速率的潜大和变形温度的降低而增加,并且临界应变和净值应变之间有一定的关系■即灵=0. 69 环;动态再结晶时临界应变的预测模型可以表示为€c = -^Z0 H25,<> 关键词:Inconel 625合金;加工硬化率;动态再结晶;临界应变 中图分类号:TG146 文献标识码:A 文章编号:1674-6457(2012)02 0001-05 Critical Conditions of Dynamic Recrystallization during High Speed Hot Deformation of Inconel 625 Alloy TAO Lin , CHENG Ming ■ SONG Guan^sheng • ZHANG Shi-hong (Institute of Metal Researcht Chinese Academy of Sciences. Shenyang 110016» China) Abstract: 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 rccrysiallization for In・ conel 625 alloy were studied by using the work hardening rate 0、combined with the inflection point criterion of In &€ curves and the minimum value of — "(In 0)/curves・ The results indicate that the \n curve of In