王珏,梅莹,王浩宇

• 1:江苏省先进结构材料与应用技术重点实验室
• 2:南京工程学院材料工程学院
• 3:北京科技大学材料科学与工程学院

摘要(Abstract)：

针对铸态690合金,利用单向热压缩实验研究了外力与柱状晶垂直时材料的热变形行为,并对流变曲线进行了本构分析,对变形显微组织进行观察。结果表明:在工程应变量50%范围内,铸态690合金的变形抗力随着应变量的增大而持续增长,变形结束时仍没有达到峰值应力。硬化率曲线存在3个线性区域,而动态再结晶区域只在应变速率为0.01 s-1时出现。变形温度的升高和应变速率的降低均会使流变应力减小。组织分析表明,柱状晶条件下材料的动态再结晶主要有3种形核方式:应变诱发晶界迁移、碳化物颗粒诱发形核和形变带亚晶转化形核。再结晶软化作用的弱化和亚晶的形成是导致铸态690合金变形抗力持续增加的主要原因。

关键词(KeyWords)： 铸态690合金;热压缩;加工硬化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年科学基金(51301085);; 南京工程学院引进人才科研启动基金(YKJ201305)

作者(Author): 王珏,梅莹,王浩宇

DOI: 10.13289/j.issn.1009-6264.2015.09.004

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