形变热处理对屋面用Al-Mn合金板再结晶行为的影响  

Effect of Thermomechanical Heat Treatment on Recrystallization Behavior of Al-Mn Alloy Plate for Roof

作　　者：张璞[1,2] ZHANG Pu(Department of Architecture and Civil Engineering, Shijiazhuang Vocational Technology Institute, Shijiazhuang 050000, China;School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China)

机构地区：[1]石家庄职业技术学院建筑工程系 [2]武汉理工大学材料科学与工程学院

出　　处：《热加工工艺》2018年第8期138-142,145,共6页Hot Working Technology

摘　　要：研究了预变形和中间退火对Al-Mn合金板显微组织和第二相析出行为的影响,并对比分析了传统无预变形和中间退火的Al-Mn合金板的组织特征。结果表明：400℃/1 h退火和20%冷变形后进行270℃等温退火,随着退火时间延长,合金中第二相含量有所增加、均匀性有所提升;当等温保温时间超过72 h后不会继续从固溶体中析出第二相,而是发生第二相的粗化和长大;随着最终退火温度的升高,未经过中间退火和预变形的Al-Mn合金发生了回复、部分再结晶和完全再结晶过程,且在退火温度高于320℃时可见再结晶晶核的存在;而经过中间退火和20%冷轧变形的试样,在最终退火过程中形成了在条带状晶粒中均匀分布的细小等轴晶粒,形成了细小等轴晶和粗大板条状晶粒共存的“双峰组织”。The effects of predeformation and intermediate annealing on the microstructure and the second phase precipitation behavior of the Al-Mn alloy sheet were investigated, and the microstructure of the traditional Al-Mn alloy plate without pre-deformation and intermediate annealing were compared and analyzed.The results show that, when isothermal annealing at 270 ℃ after 400 ℃ / 1 h annealing and 20% cold deformation, the content of the second phase increases and the homogeneity increases with the increase of annealing time.When the isothermal insulation time is more than 72 h, the second phase doesn＇t continue to precipitate from the solid solution, but the second phase is coarsened and grown.With the increase of the final annealing temperature, the recovery, partial recrystallization and complete recrystallization of the Al-Mn alloy without intermediate annealing and pre-deformation occur, and the existence ofrecrystallized nucleus can be seen at annealing temperature above 320 ℃. For the specimen after intermediate annealing and 20% cold rolling deformation, fine equiaxed grains are formed in the final annealing process, and the ＂double peak structure＂ of the fine equiaxed grains and coarse stripe grains are formed.

关 键 词：中间退火 预变形 AL-MN合金 再结晶 组织 

分 类 号：TG156.93[金属学及工艺—热处理] TG113.1[金属学及工艺—金属学]