摘要
对GH720Li合金棒坯在不同加热温度和保温时间下的晶粒长大行为进行研究,建立并验证了热变形加热过程的晶粒长大模型。结果表明,合金棒坯的平均晶粒尺寸随加热温度的升高与保温时间的延长而增大。当加热温度为1120℃时,晶粒开始较明显长大;当加热温度为1160℃时,晶粒显著长大。在1120、1160℃加热条件下晶粒长大行为的差异与γ'相的回溶程度密切相关。为了提高模型预测精度,分别在1000~1120℃和1120~1160℃两个加热温度下建立了GH720Li合金晶粒长大模型。所建立的模型得到的数据与试验数据吻合性高,可用于加热过程中晶粒尺寸演变的模拟计算。
The grain growth behaviors of GH720Li alloy at different heating temperatures and holding time were investigated. The grain growth model in hot deformation heating process was established and verified. The results show that the average grain size of GH720Li alloy billets increases with increasing heating temperature and holding time. When the heating temperature reaches 1120℃, the grain begins to grow obviously. However, when the heating temperature reaches 1160 ℃,the grain grows very quickly. The different grain growth behavior at 1120 ℃ and 1160 ℃ is closely related to different levels of dissolution of γ precipitates. In order to improve the accuracy of the model prediction, the grain growth models of GH720Li alloy are established respectively in different temperature ranges which are 1000-1120 ℃ and 1120-1160℃. The data obtained by established models have a high consistence with actual experimental results, which could be used to calculate the evolution of grain size during heating process in the simulation.
出处
《热加工工艺》
CSCD
北大核心
2017年第8期107-112,共6页
Hot Working Technology
基金
国家自然科学基金资助项目(51404222)
益材青年基金资助项目(YF53152308)
