摘要
针对5B70铝合金密封舱体加强筋的微观组织演变问题,基于元胞自动机理论,引入拓扑算法,建立晶粒形核、长大和再结晶模型,研究了单道次微铸锻工序中加强筋的微观组织演变过程,分析了应变量对动态再结晶与静态再结晶晶粒尺寸及体积分数的影响。结果表明:最佳微锻应变量为0.3;在微锻过程中由于塑性变形温度过低,动态再结晶体积分数最大仅为35%,在下一道次的微铸阶段,该组织发生完全静态再结晶,晶粒均匀细小,约为30μm。
According to the evolution of microstructure in the stiffener of 5B70 alloy sealed cabin,the models of nucleation,grain growth and recrystallization were established based on the theory of Cellular Automata and the algorithm of topology.The microstructure evolution of the stiffener in the single-pass microcasting and micro for ging composite process was studied.The effect of strain on the grain size and volume fraction of recrystallization was analyzed and the optimal strain was determined as 0.3.In the next micro-casting stage,complete static recrystallization was carried out in the microstructure with uniform and fine grains about 30μm.
作者
刘永康
王少华
赖小明
李振伦
王博
王国峰
LIU Yongkang;WANG Shaohua;LAI Xiaoming;LI Zhenlun;WANG Bo;WANG Guofeng(School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China;Beijing Spacecrafts,Beijing 100094,China)
出处
《载人航天》
CSCD
北大核心
2021年第4期438-445,共8页
Manned Spaceflight
基金
载人航天领域预先研究项目(040301)。
关键词
5B70铝合金
密封舱
加强筋
微铸锻
元胞自动机
5B70 aluminum alloys
sealed cabin
stiffener
micro-casting and forging
cellular automata
