热加工工艺对Ti-38644合金挤压管组织与性能的影响  

Effect of hot working process on microstructure and mechanical properties of extruded Ti-38644 titanium alloy tube

作　　者：杜宇 戚运莲[1] 辛社伟[1] 曾立英[1] 刘伟[1] 孙花梅 谭伟力 Du Yu;Qi Yunlian;Xin Shewei;Zeng Liying;Liu Wei;Sun Huamei;Tan Weili(Northwest Institute for Nonferrous Metal Research,Xi'an Shaanxi 710016,China)

机构地区：[1]西北有色金属研究院

出　　处：《金属热处理》2019年第6期162-165,共4页Heat Treatment of Metals

摘　　要：研究了镦拔工艺、挤压温度以及热处理对Ti-38644钛合金挤压管材显微组织和力学性能的影响。结果表明:Ti-38644合金经过多次镦拔后的挤压管材晶粒得到细化,均匀性更好,从而提高了挤压管材的综合性能。在860℃和930℃挤压Ti-38644合金管材具有良好的力学性能,断面收缩率可以达到60%左右。固溶处理对Ti-38644合金挤压管材的抗拉强度、伸长率和断面收缩率影响不大。860℃挤压Ti-38644合金管经815℃×1 h+550℃×24 h固溶时效热处理后,其抗拉强度大于1116 MPa,伸长率大于15%,断面收缩率大于40%。The effects of upsetting and cogging and extrusion temperature and heat treatment on the microstructure and mechanical properties of Ti-38644 titanium alloy tube were studied.The results show that the grains of extruded tube of Ti-38644 alloy are refined and the uniformity is better after repeated upsetting and cogging,which improve the comprehensive performance of the extruded tube.The extruded tubes of Ti-38644 alloy have good mechanical properties and the reduction of area can reach about 60%,when the extrusion temperature is 860℃and 930℃.The tensile strength,elongation and reduction of area of Ti-38644 alloy extruded tubes are not improved after different solution treatment.After solution treating at 815℃for 1 h plus aging at 550℃for 24 h,the tensile strength of Ti-38644 alloy extruded at 860℃is over than 1116 MPa,the elongation is over than 15%,and the reduction of area is more than 40%.

关 键 词：Ti-38644钛合金 热加工工艺 挤压管材 显微组织 力学性能 

分 类 号：TG316.2[金属学及工艺—金属压力加工]