固溶温度对TC16钛合金显微组织与冲击韧性的影响  

Effect of Solution Temperature on Microstructure and Impact Toughness of TC16 Titanium Alloy

作　　者：张明玉 张天蔚 岳旭 ZHANG Mingyu;ZHANG Tianwei;YUE Xu(Xinjiang Xiangrun New Materials Technology Co.,Ltd.,Hami 839000,China;School of Mechanical Engineering,Dalian Jiaotong University,Dalian 116028,China;Shi Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]新疆湘润新材料科技有限公司,哈密839000 [2]大连交通大学机械工程学院,大连116028 [3]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016

出　　处：《机械工程材料》2024年第12期25-30,共6页Materials For Mechanical Engineering

基　　金：新疆维吾尔自治区重点研发计划项目(2022B01029)。

摘　　要：分别在两相区温度(840,860℃)与单相区温度(880℃)下对TC16钛合金进行2 h固溶处理,再进行560℃×8 h时效处理,研究了固溶温度对固溶态和时效态合金显微组织、物相组成和冲击韧性的影响。结果表明:经固溶处理后TC16钛合金组织主要由α相与α"相组成,再经时效处理后,主要由α相和β相组成;固溶温度的升高使固溶态合金中的初生α相含量降低,等轴化程度增加,针状α相和α"相含量增加,当固溶温度升高到880℃时,初生α相完全消失;再经时效处理后,组织中形成大量针状次生α相,且次生α相含量随固溶温度的升高而增加,而初生α相含量和尺寸与固溶态相比无明显变化。随着固溶温度的升高,固溶处理后合金的冲击吸收能量和冲击韧性值增加;经时效处理后,二者相比于固溶态均减小,且随固溶温度升高而不断降低;随着固溶温度的升高,冲击断口中韧窝数量减少,当固溶温度为880℃时,冲击断口主要由解理面组成;再经时效处理后,断口中出现较多二次裂纹,随着固溶温度的升高,二次裂纹数量增加。TC16 titanium alloy was treated by solution at two-phase region temperature(840,860℃)and single-phase region temperature(880℃)for 2 h,and then aging at 560℃for 8 h.The effects of solution temperature on the microstructure,phase composition and impact toughness of alloy in the solution state and in the aging state were studied.The results show that the microstructure of TC16 titanium alloy after solution was mainly composed ofαphase andα"phase,and after aging was mainly composed ofαphase andβphase.With the increase of solution temperature,the content of primaryαphase in the soluted alloy decreased,the equiaxialization degree increased,and the content of acicularαphase andα"phase increased.When the solution temperature increased to 880℃,the primaryαphase disappeared completely.After aging,a large number of needle-like secondaryαphase was formed in the microstructure,and the content of secondaryαphase increased with the increase of solution temperature,while the content and size of primaryαphases had no obvious change compared with those in the solution state.With the increase of solution temperature,the impact absorbed energy and impact toughness value of the alloy after solution increased.After aging,both of them decreased comparing with those in solution state,and decreased with the increase of solution temperature.With the increase of solution temperature,the number of dimples in the impact fracture decreased.When the solution temperature was 880℃,the impact fracture was mainly cleavage plane.After aging,more secondary cracks appeared in the fracture.With the increase of solution temperature,the number of secondary cracks increased.

关 键 词：TC16钛合金 固溶温度 显微组织 冲击韧性 断口形貌 

分 类 号：TG156.1[金属学及工艺—热处理]