(1. 太原理工大學(xué) 機(jī)械與運(yùn)載工程學(xué)院，太原 030024；
2. 太原理工大學(xué) 材料科學(xué)與工程學(xué)院，太原 030024；
3. 先進(jìn)鎂基材料山西省重點(diǎn)實(shí)驗(yàn)室，太原 030024)
摘 要: 本文采用ABAQUS數(shù)值模擬方法對(duì)AZ31鎂合金異步錯(cuò)距旋壓過程進(jìn)行數(shù)值模擬分析，研究不同工藝參數(shù)對(duì)旋壓成形性能的影響，然后依據(jù)有限元數(shù)值模擬結(jié)果，對(duì)AZ31鎂合金進(jìn)行異步錯(cuò)距旋壓，對(duì)旋壓后的微觀組織結(jié)構(gòu)進(jìn)行分析，對(duì)其微納力學(xué)性能進(jìn)行測(cè)試。結(jié)果表明：異步錯(cuò)距旋壓過程中，隨著旋壓溫度的升高，單道次旋壓的最大減薄量降低，鎂合金的變形抗力降低，材料軟化效果嚴(yán)重，材料在鎂合金表面堆積；隨著旋輪進(jìn)給量的增加，材料的堆積程度嚴(yán)重，進(jìn)給量為1.2 mm/r時(shí)較為適宜；增加旋壓道次，有利于減少裂紋和材料堆積現(xiàn)象的發(fā)生，獲得表明成形良好的鎂合金管材。隨著旋壓變形量的不斷增加，AZ31鎂合金的晶粒不斷細(xì)化，在材料內(nèi)部發(fā)生動(dòng)態(tài)回復(fù)再接結(jié)晶的同時(shí)存在局部的位錯(cuò)塞積區(qū)域，旋壓總變形量為88.3%時(shí)，平均微納硬度可達(dá)0.51 GPa。
關(guān)鍵字: 有限元模擬；AZ31鎂合金；異步錯(cuò)距旋壓；動(dòng)態(tài)再結(jié)晶；位錯(cuò)
（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
