淬火介质对7A85铝合金组织、力学性能及残余应力的影响  

Influence of Quenching Medium on Microstructure,Mechanical Properties and Residual Stress of 7A85 Aluminum Alloy

作　　者：徐玉国[1] 韩兆君[1] XU Yuguo;HAN Zhaojun(Office of Educational Administration,Yantai Nanshan University,Yantai 265713,China)

机构地区：[1]烟台南山学院教务处,山东烟台265713

出　　处：《热加工工艺》2020年第8期126-128,共3页Hot Working Technology

基　　金：龙口市重点研发计划项目(2017GG23)。

摘　　要：研究了不同淬火介质对7A85航空铝合金微观组织、残余应力和力学性能的影响。结果表明:经10%NaCl+KNO3盐溶液淬火后,铝合金试样的屈服强度和抗拉强度分别为556 MPa和577 MPa,伸长率为12%,与25℃水和5%PAG溶液淬火介质相比,试样的力学性能更优。经5%PAG溶液淬火后,试样表面残余应力最小,横向和纵向分别为-100 MPa和-123MPa,相对于25℃水淬,试样横向和纵向残余应力分别降低了44%和32%。采用冷却效率最高的10%NaCl+KNO3盐溶液淬火介质,可得到高于0.32vol%的第二相颗粒比例,淬火介质对再结晶基体组织没有明显的影响。The effects of different quenching media on microstructure,residual stress and mechanical properties of 7A85 aviation aluminum alloy were studied.The results show that after quenching with 10%NaCl+KNO3 salt solution,the yield strength and tensile strength of the aluminum alloy samples are 556 MPa and 577 MPa,respectively,and the elongation is 12%.Compared with those quenchen by 25℃ water and 5% PAG solution quenching medium,the mechanical properties of the samples are better.After quenching with 5% PAG solution,the residual stress on the surface of the sample is the smallest,and the transverse and longitudinal residual stresses are-100 MPa and-123 MPa,respectively.Compared with those quenchen by water at 25℃,the transverse and longitudinal residual stresses of the samples are reduced by 44% and 32%,respectively.The second phase particle ratio higher than 0.32vol% can be obtained by using the quenching medium of 10% NaCl+KNO3 salt solution with the highest cooling efficiency.The quenching medium has no obvious effect on the microstructure of the recrystallized matrix.

关 键 词：航空铝合金 微观组织 残余应力 淬火介质 

分 类 号：TG166.3[金属学及工艺—热处理] TG156.32[金属学及工艺—金属学]