固溶和时效处理的TC19钛合金的微观组织和拉伸性能  

Microstructure and Tensile Properties of TC19 Titanium Alloy Solution Treated and Aged

作　　者：张鼎祖 陈璐 ZHANG Dingzu;CHEN Lu(Xinjiang Xiangrun New Materials Technology Co.,Ltd.,Hami 839000,Xinjiang,China)

机构地区：[1]新疆湘润新材料科技有限公司,新疆哈密839000

出　　处：《热处理》2025年第1期17-19,23,共4页Heat Treatment

摘　　要：对TC19钛合金分别在940℃、960℃、980℃、1000℃进行加热2h水冷的固溶处理,然后进行560℃时效处理,热处理后检测合金的微观组织、拉伸性能和拉伸断口的微观形貌。结果表明:时效温度不变,随着固溶温度的提高,合金显微组织从双态结构转变为层片状结构,次生α相含量增加,初生α相含量减少至消失,且强度升高塑性降低,在单相区温度固溶处理随后时效的合金强度和塑性变化不明显;在两相区温度固溶处理随后时效处理的合金拉伸断口有韧窝和少量空洞及二次裂纹,而在单相区温度固溶处理随后时效处理的合金拉伸断口有少量细小韧窝和明显的撕裂棱和解理台阶。TC19 titanium alloy was solution treated by heating at 940,960,980 and 1000℃for 2 h followed by water cooling and then aged at 560℃,respectively.After this,the alloy was tested for microstructure,tensile properties and microscopic morphology of tensile fracture.The results showed that(a)when the aging temperature was constant,as the solution temperature was raised,the microstructure of the alloy changed from binary structure to fine lamellar structure,the content of secondaryαphase increased,the content of primaryαphase decreased until it disappeared,and the strength increased and the plasticity decreased,the alloy solution treated at temperature in single-phase region then aged had no evident change in strength and plasticity;and(b)the tensile fracture exhibited dimples,a small amount of voids and secondary cracks for the alloy solution treated at temperature in two-phase region then aged,and a small amount of fine dimples,obvious tearing edges and cleavage steps for the alloy solution treated at temperature in single-phase region then aged.

关 键 词：TC19钛合金 微观组织 拉伸性能 拉伸断口 

分 类 号：TG156.94[金属学及工艺—热处理]