(1. 太原理工大学 机械与运载工程学院，太原 030024；
2. 太原理工大学 材料科学与工程学院，太原 030024；
3. 先进镁基材料山西省重点实验室，太原 030024)
摘 要: 本文采用ABAQUS数值模拟方法对AZ31镁合金异步错距旋压过程进行数值模拟分析，研究不同工艺参数对旋压成形性能的影响，然后依据有限元数值模拟结果，对AZ31镁合金进行异步错距旋压，对旋压后的微观组织结构进行分析，对其微纳力学性能进行测试。结果表明：异步错距旋压过程中，随着旋压温度的升高，单道次旋压的最大减薄量降低，镁合金的变形抗力降低，材料软化效果严重，材料在镁合金表面堆积；随着旋轮进给量的增加，材料的堆积程度严重，进给量为1.2 mm/r时较为适宜；增加旋压道次，有利于减少裂纹和材料堆积现象的发生，获得表明成形良好的镁合金管材。随着旋压变形量的不断增加，AZ31镁合金的晶粒不断细化，在材料内部发生动态回复再接结晶的同时存在局部的位错塞积区域，旋压总变形量为88.3%时，平均微纳硬度可达0.51 GPa。
关键字: 有限元模拟；AZ31镁合金；异步错距旋压；动态再结晶；位错
（1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
3. Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan 030024, China）
Abstract:In this study, ABAQUS numerical simulation method was used to analyze the asynchronous stagger spinning process of AZ31 magnesium alloy and the effects of different process parameters on the spinning properties were studied. Based on the simulation results, the asynchronous stagger spinning of AZ31 magnesium alloy was carried out, and the microstructure and micro-nano mechanical properties were tested. The results show that with the increase of spinning temperature, the maximum thinning of single pass spinning and the deformation resistance decrease due to the serious softening effect of the material and the material accumulation on the surface of AZ31 magnesium alloy during the asynchronous stagger spinning process. With the increase of feed amount of rotary wheel, the material accumulation degree is serious, and it is more appropriate when the feed amount is 1.2 mm/r. In addition, increasing the number of spinning passes is beneficial to reduce the occurrence of cracks and material accumulation. With the increase of spinning deformation, the grain size of AZ31 magnesium alloy is continuously refined, and the dynamic recovery recrystallization occurs and the local dislocation plug area also exists in the alloy. When the spinning deformation reaches 88.3% in total, the average micro-nano hardness can reach 0.51 GPa.
Key words: finite element simulation; AZ31 magnesium alloy; asynchronous stagger spinning; dynamic recrystallization; dislocation
