摘要
AZ80镁合金搅拌摩擦焊成形时,接头组织承受摩擦受热、升温及降温。探讨了接头不同区域由于受热程度不同、冷却速度不同,产生组织晶粒大小不同,显微硬度不同。结果显示:焊核区在接头中硬度最低,而下部焊核在中心焊核中,硬度最高,晶粒最小;热机影响区硬度大于焊核区,相应组织较粗大及母材挤压成形流线影响仍大;热影响区硬度更接近母材,组织接近母材,受挤压形成的织构强化、应变硬化仍存在;前进侧硬度比后退侧的小,前进侧的组织比后退侧的组织粗大。
The microstructure of butt joint suffers fi＇iction heat, warming and cooling when AZ80 alloy is friction stir welded. The microstructure of different area of the welded joint undergo heating and cooling speed at different levels which can produce that the grain size was different, the different microhardness was discussed systematically. The results show that the nugget zone （NZ） of the welded joint has lowest hardness ,and Lower NZ has highest microhardness and least grain of Center NZ. The thermo-mechanically affected zone has higher hardness than NZ, the corresponding microstructure is bulky and extrusion forming streamline of the base metal has still large influence. The hardness of heat affected zone is closed to the base metal. The microstructure is closed to the base metal, owing to structural strengthening and strain hardening of BM. The microstructure of advancing side（AS） is bigger than that of retreating side（RS）, and the hardness of AZ is smaller than that of RS.
出处
《热加工工艺》
CSCD
北大核心
2013年第9期201-204,共4页
Hot Working Technology
