热处理对工业纯钛自冲铆接头力学性能的影响  

Effect of Heat Treatment on Mechanical Properties of Commercial Pure Titanium Self-piecing Riveted Joints

作　　者：卢毅[1] 何晓聪[1] 王医锋 邢保英[1] 

机构地区：[1]昆明理工大学机电工程学院,昆明650500

出　　处：《航空材料学报》2015年第6期48-52,共5页Journal of Aeronautical Materials

基　　金：国家自然科学基金资助项目(50965009)

摘　　要：对工业纯钛自冲铆接头整体进行去应力退火和淬火处理,并对未热处理和热处理后的接头进行静拉伸试验,对比分析热处理工艺对接头的力学性能及失效机理的影响。结果表明:两种热处理工艺可以提高工业纯钛自冲铆接头的静强度,去应力退火可以提高接头的静态能量吸收能力,淬火对接头的静态能量吸收能力几乎没有影响;三种接头的失效模式都为铆钉被拉出或拉断,且未热处理的接头的铆钉断口呈现为沿晶脆性断裂特征,去应力退火后的接头的铆钉断口呈现为韧性断裂特征,淬火处理后接头的铆钉断口呈现为准解理断裂特征;去应力退火为工业纯钛自冲铆接头较优的热处理工艺。The stress relief annealing and quenching were applied to treat the whole commercial pure titanium self-piecing riveted （SPR） joints. The static tensile test was used to test the joints before and after treatment. The effects of heat treatment on the mechanical propeities and the failure mechanism of the joints were analyzed. The results show that the two kinds of heat treatment processes can improve the static strength of the commercial pure titanium SPR joints. The stress relief annealing can improve the static energy absorption ability of the joints, and quenching has little impact on the static energy absorption ability of the joints. The failure modes of the three joints are the rivet being pulled out or cracked. The fracture morphology of the rivet in the joint that is not treated presents the characteristic of intergranular brittle fracture, the rivet in the joint that is treated by stress relief annealing shows the characteristic of ductile fracture, and the rivet in the joint that is treated by quenching displays the characteristic of quasi-cleavage fracture. The stress relief annealing is the preferable heat treatment of the commercial pure titanium SPR joints.

关 键 词：自冲铆 工业纯钛 热处理 拉伸试验 断口分析 

分 类 号：TG156.9[金属学及工艺—热处理]