热处理工艺对Ti650合金板材组织演变及性能的影响研究  

Effect of Heat Treatment on Microstructure Evolution and Properties of Ti650 Alloy Plate

作　　者：侯红苗[1] 王晓 杨海瑛[1] 赵圣泽 周伟[1] 闫康 钱融涛 辛社伟[1] Hou Hongmiao;Wang Xiao;Yang Haiying;Zhao Shengze;Zhou Wei;Yan Kang;Qian Rongtao;Xin Shewei(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《钛工业进展》2024年第2期6-10,共5页Titanium Industry Progress

摘　　要：研究了不同热处理工艺对Ti650合金板材组织演变及性能的影响。结果表明:Ti650合金板材对固溶温度的变化较为敏感,随着固溶温度的升高,加剧了初生α相的溶解,次生α相尺寸更加细小,且交错排列,增加了位错运动的阻力,板材强度升高,塑性降低。提高时效温度,次生α相由细针状长大粗化成为长片层状或短片层状,交错排列成不同取向的集束,板材塑性大幅升高,强度略有降低。在时效温度700℃、时效时间2.5~6 h条件下,时效时间对板材组织与性能的影响较小。固溶冷却速率会影响次生α相的形核、析出和长大,降低冷却速率,次生α相由弥散的细针状长大成为短棒状,细晶强化作用减弱,板材室温强度降低,塑性提高。The effects of different heat treatment processes on the microstructure evolution and properties of Ti650 alloy plate were studied.The results show that Ti650 alloy plate is sensitive to the change of solution temperature.The primaryαphase dissolution occurs with the increase of solution temperature,and the secondaryαphase is smaller in size and staggered,which increases the resistance of dislocation movement,increases the strength and decreases the plasticity of the plate.Increasing aging temperature,secondaryαphase changes from fine needle like to long or short layered,arranged in staggered bundles with different orientations,resulting in a significant increase in the plasticity and an appropriate decrease in strength.Under the condition of aging temperature of 700℃and aging time of 2.5~6 hours,the effect of aging time on the microstructure and properties of the plate is relatively small.The nucleation,precipitation and growth of secondaryαphase are affected by different solution cooling rates.Reducing cooling rate,the secondaryαphase grows from dispersed fine needle to short rod,and the strengthening effect of fine grains weakens,resulting in the decrease of room temperature strength,and the increase of plasticity.

关 键 词：Ti650合金 板材 固溶时效 组织演变 断口形貌 

分 类 号：TG166.5[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]