Evolution of Twin Boundaries and Contribution to Dynamic Recrystallization and Grain Growth of Inconel 625
Evolution of Twin Boundaries and Contribution to Dynamic Recrystallization and Grain Growth of Inconel 625
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Inconel 625 双晶界的演变及其对动态再结晶和晶粒长大的贡献
DOI：
10.1002/adem.201900426
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发表时间：
2019
影响因子：
3.6
通讯作者：
Ding Yutian
中科院分区：
文献类型：
--
作者：
Jia Zhi;Gao Zexi;Ji Jinjin;Liu Dexue;Guo Tingbiao;Ding Yutian
通过热压缩试验研究了Inconel 625合金在900-1200 °C温度范围和0.01 ~ 10 s-1应变速率范围内的动态再结晶和晶粒长大行为。电子背散射分布技术是一种有效的方法，用于识别孪晶界演化的温度和应变速率的基础上，这种方法被应用在这项研究中，以调查的影响孪晶的动态再结晶过程和晶粒生长。在所有应变速率下，动态再结晶分数均随温度升高而增加，但应变速率对动态再结晶的影响较为复杂。晶粒尺寸随温度的变化遵循类似的先减小后增大的趋势，而在不同的应变速率下没有观察到明显的趋势。随着变形温度的降低和应变速率的增加，Inconel 625合金的动态再结晶机制由不连续动态再结晶转变为连续动态再结晶。在低温（<1100 °C）下，孪晶3 n（n= 1，2，3）晶界的比例随温度的升高而增加，而在高温（≥ 1100 ° C）下，孪晶3 n（n= 1，2，3）晶界的比例随温度的升高而减少。在低温（<1100 °C）下，当应变速率达到1 s− 1时，晶界的比例随着应变速率的增加而下降，然后增加。
Dynamic recrystallization (DRX) and grain growth behaviors of Inconel 625 alloy are investigated via hot compression test in the temperature range of 900–1200 °C and strain rate range of 0.01–10 s−1. The electron backscatter distribution technique is an effective method for identifying twin boundary evolution on the basis of temperature and strain rate; this approach is applied in this study to investigate the effects of twins on the DRX process and grain growth. The fraction of DRX increases with temperature under all strain rates, but the strain rate exerts a complex effect on DRX. Grain size variation with temperature follows a similar trend of declining and then increasing, whereas no apparent trend is observed at various strain rates. The DRX mechanism of the Inconel 625 alloy shifts from discontinuous DRX to continuous DRX with a reduction in deformation temperature and increase in strain rate. The fraction of Σ3n(n= 1, 2, 3) boundaries (twin boundaries) increases with increasing temperature at low temperatures (<1100 °C), but declines with increasing temperature at high temperatures (≥1100 °C). At low temperatures (<1100 °C), the fraction of Σ3n(n =1, 2, 3) boundaries declines with an increasing strain rate up to 1 s−1and then increases.