热处理制度对TC4-DT钛合金组织与性能的影响  

Effect of Heat Treatment Processes on Microstructure and Properties of TC4-DT Titanium Alloy

作　　者：李婷[1] 杜宇[1] 赵亮[1] 常江[1] 毛小南[1] Li Ting Du Yu Zhao Liang Chang Jiang Mao Xiaonan(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》2017年第4期22-25,共4页Titanium Industry Progress

摘　　要：采用4种热处理制度对TC4-DT钛合金锻件进行处理,研究不同热处理制度对其组织与性能的影响。结果表明:经730℃×45 min/AC退火处理后,组织为双态组织,冲击韧性和伸长率较高,断裂韧性较低;经1 010℃×45min/AC退火处理后,组织为魏氏组织,断裂韧性居中,抗拉强度达到最低值;经950℃×45 min/WQ+480℃×6 h/AC处理后,获得细小等轴组织,抗拉强度最大(1 082 MPa),并且断裂韧性和断面收缩率有较大提高,但冲击韧性有所下降;经1 010℃×45 min/WQ+480℃×6 h/AC处理后,获得魏氏组织,断裂韧性最佳(94.5 MPa·m1/2),强度也较高,但冲击韧性、断面收缩率、伸长率达到最低值。Four kinds of heat treatment processes were used to study the effect on the microstructure and properties of the TC4-DT titanium alloy forging. The results show that after the processing of 730℃ ×45 min/AC, duplex micro- structure is acquired, which the impact toughness and elongation are much higher, but the fracture toughness is lower; after the processing of 1 010℃×45 min/AC, the widmanstatten structure is obtained, which the fracture toughness is in the middle value, the tensile strength is the lowest; after the processing of 950℃ ×45 min/WQ ＋ 480℃ × 6 h/ AC, a uniform fine equiaxed mierostructure is obtained, which the tensile strength is up to 1 082 MPa, and fracture toughness and reduction in area are also increased, but impact toughness is reduced; after the processing of 1 010℃ × 45 min/WQ ＋ 480℃ × 6 h/AC, the widmanstatten structure is obtained with the highest fracture toughness （94.5 MPa·m^1/2） , and tensile strength is also higher, but the impact toughness, reduction in area and elongation achieve the lowest values.

关 键 词：TC4-DT钛合金 断裂韧性 冲击韧性 抗拉强度 金相组织 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG166.5[金属学及工艺—金属材料]