摘要
镁铝层合板经轧制成形后会产生大量的残余应力,严重影响层合板的后续加工和板材的使役性能。对三道次升温热轧的镁铝层合板进行不同工艺的退火处理后,使用iXRD-X射线残余应力检测仪测量层合板的表面残余应力,采用SEM-EBSD技术分析层合板的表面微观组织。结果表明:退火前层合板表面残余应力沿平面的分布存在各向异性,各道次层合板的表面残余应力不同;残余应力在不同退火工艺下的消除机制不同,低温下为回复退火,中温下为回复与再结晶作用共存,高温下为再结晶退火;局域取向差值(KAM)可反映位错密度的分布,从而对残余应力进行表征,KAM越小,残余应力的消除效果越好。研究结果对改善镁铝层合板的后续加工性能及扩大板材的适用范围等问题提供了帮助。
After rolling,a large amount of residual stress will be generated in Mg-Al laminates,which will greatly affect the subsequent processing and service performance of the laminates.In this paper,the surface residual stress of Mg-Al laminates after annealing treatment of different processes was measured by iXRD-X ray residual stress detector,and the surface microstructure of the laminates was analyzed by SEM-EBSD technology.The results show that the surface residual stress of laminates is anisotropic along the plane before annealing,and the surface residual stress of laminates in different passes is different.The elimination mechanism of residual stress is different under different annealing processes.Recovery annealing is at low temperature,recovery and recrystallization coexist at medium temperature,and recrystallization annealing is at high temperature.The local orientation difference(KAM)can reflect the distribution of dislocation density and thus characterize the residual stress.The smaller the KAM,the better the elimination effect of residual stress.The results are helpful to improve the subsequent processing performance and expand the application range of Mg-Al laminates.
作者
张柏瑞
周存龙
赵广辉
王涛
赵博文
ZHANG Borui;ZHOU Cunlong;ZHAO Guanghui;WANG Tao;ZHAO Bowen(College of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《有色金属工程》
CAS
北大核心
2022年第5期22-29,共8页
Nonferrous Metals Engineering
基金
山西省科技重大专项(20181101008)。
关键词
镁铝层合板
升温热轧
退火
表面残余应力
微观组织
Mg-Al laminate
heating and hot rolling
annealing
surface residual stress
microstructure
