AZ31 镁合金板弯曲矫直过程中的应力分析及组织演变  

Stress Analysis and Microstructure Evolution of AZ31 Magnesium Alloy Sheetin Bending and Straightening Process

作　　者：田静 邓嘉飞 常原颖 梁伟[1,2] TIAN Jing;DENG Jiafei;CHANG Yuanying;LIANG Wei(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Instrumental Analysis Center,Taiyuan University of Technology,Taiyuan 030600,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]太原理工大学分析测试中心,山西太原030600

出　　处：《热加工工艺》2023年第7期85-88,共4页Hot Working Technology

基　　金：国家自然科学基金联合重点项目(U1810208)。

摘　　要：研究AZ31镁合金板在弯曲矫直工艺过程中应力分布及其对微观组织的影响。结果表明:弯曲矫直过程中波峰和波腰处板材的受力不同,导致其组织有所不同。波腰处会产生更多的拉伸孪晶,切割晶粒,导致晶粒细化,导致板材在弯曲矫直后抗拉强度有所提升。拉伸孪晶处有更大的储能为再结晶提供形核位点,产生更多的细小晶粒。同时拉伸孪晶会导致晶粒取向的变化,使其更有利于滑移。因此,弯曲矫直导致板材性能提升,波腰处的组织起主要作用。The stress distribution of AZ31 magnesium alloy sheet during the bending and straightening process and its influence on the microstructure were studied.The results show that in the bending and straightening process,the stress of the sheet at the wave crest and the wave waist is different,resulting in different microstructure.More tensile twins will be produced at the corrugated waist,which will cut the grains,resulting in grain refinement and an increase in the tensile strength of the sheet after the bending and straightening.There is greater energy storage at the tensile twins to provide nucleation sites for recrystallization and produce more small grains.At the same time,tensile twins will cause changes in grain orientation,making it more conducive to slip.Therefore,the bending and straightening leads to the improvement of the sheet performance,and the microstructure of the wave waist plays a major role.

关 键 词：AZ31镁合金板 拉伸孪晶 应力分布 

分 类 号：TG339[金属学及工艺—金属压力加工] TG335.11