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OALib Journal期刊
ISSN: 2333-9721
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gh4169合金delta工艺中的变形行为和微观组织演变*
Keywords: 金属材料,gh4169合金,delta工艺,δ相,变形行为,微观组织
Abstract:
？在950-1010℃用gh4169合金的delta工艺进行应变速率为0.005-0.1s-1的等温恒应变速率压缩实验,系统研究了δ相对合金热变形行为和微观组织演变的影响。结果表明:初始δ相含量分别为0、3.65%和8.14%的gh4169合金的真应力–真应变曲线均为具有单峰特征的曲线,其本构方程均满足双曲正弦函数,变形激活能分别为441.3、445.8和487.7kj/mol;3种合金在热变形过程中的主要软化机制均为动态再结晶;在相同变形条件下,随着δ相含量的增加,动态再结晶临界应变显著降低,再结晶晶粒尺寸减小,再结晶体积分数增大;其中固溶态合金的再结晶形核方式主要为基体γ相的晶界弓弯形核,而预析出δ相的合金中δ相与基体γ相的相界也是再结晶形核的有利位置。由此可见,δ相的存在能促进动态再结晶的发生。
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