ZL205A铝合金厚板淬火热力耦合数值模拟  

Coupled Thermal-stress Numerical Simulation on Quenching of ZL205A Aluminum Alloy Thick-plate

作　　者：陈理业[1] 白明达 毛健[1] 蒋渝[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065 [2]四川成都宏博科技发展有限公司,四川成都610065

出　　处：《热加工工艺》2012年第12期124-127,共4页Hot Working Technology

基　　金：国家科技支撑计划基金项目(2007BAE09B02)

摘　　要：通过理论推导确定了影响ZL205A铝合金淬透性及残余应力的因素,采用ANSYS有限元软件进行模拟分析。结果表明:常温下,换热系数小于9000 W.m-2.℃-1时,提高换热系数能够显著提高厚板心部冷却能力;当换热系数超过9000 W.m-2.℃-1增大时,心部冷却效果不再显著提升;残余应力随着厚度增大而增大,但厚度超过100 mm后不再显著变化;淬火结束后表面上残余应力主要集中在厚度方向的表面,进一步研究该表面的残余应力分布可以更好改善材料性能;通过改变换热系数及板材设计厚度是改善铝合金厚板淬透性及控制残余应力的关键。According to the theoretical derivation, the effect factors of quench-hardening of ZL205A aluminum alloy were determined. With the analysis of ANSYS, the results show that when heat transfer coefficient （HTC）is within 9000W·m^-2·℃^-1, increasing HTC can obviously improve the cooling effect of the center, while the cooling effect of the center cannot be improved noticeably when HTC is over 9000W·m^-2·℃^-1. Residual stress increases when the thickness is increasing, however it will not change obviously when the thickness is over 100 mm. When quenching is over, surface residual stress is mainly on the surface of thickness direction, and it can improve the thick-plate performance by further study of this surface. The key of improving the quench-hardening and controlling the residual stress are HTC and thickness of the plate.

关 键 词：换热系数 铝合金厚板 淬透性 残余应力 

分 类 号：TG166.3[金属学及工艺—热处理]