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固溶时效对激光直接沉积Ti6Al4V合金组织和性能的影响

Effect of Solution Aging on Microstructure and Mechanical Properties of Laser Direct Deposited Ti6Al4VAlloy
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摘要 采用激光直接沉积的方式成功制备无冶金缺陷的高质量沉积态样件,研究固溶温度(910~970℃)和时效温度(500~600℃)对沉积态样件的相组成、显微组织和拉伸性能的影响。研究结果表明,沉积态和固溶时效态合金的显微组织均由大量的α-Ti(α)相和少量的β-Ti(β)相构成;另外,随着固溶温度和时效温度的升高,显微组织内的α相由细长的针状转变为短棒状。拉伸性能方面,确定了固溶时效态试样(940℃/1 h/WQ+550℃/4 h/AC、970℃/1 h/WQ+550℃/4 h/AC和940℃/1 h/WQ+600℃/4 h/AC)的拉伸强度指标高于锻件国家标准要求(σ_(b)≥895 MPa,σ_(0.2)≥828 MPa,δ≥10%);断口形貌均属于塑性断裂。 The high-quality deposited samples with no metallurgical defects were investigated by laser direct deposition to research the effects of solution temperature(910-970 ℃)and aging temperature(500-600℃)on the phase composition,microstructure,and tensile properties of the deposited samples.The result shows that the alloy microstructure of the as-deposited and solution-aging samples contain a large amount ofα-Ti(a)phase and a small amount of pTi(p)phase.In addition,as solution and aging temperatures increase,the a-Ti(a)phase of microstructure changes from the acicular to the short rod-like.For the tensile properties,there is a higher tensile strength index in the solution aging state(940 ℃/1 h/WQ+550 C/4 h/AC,970℃/1 h/WQ+550℃/4 h/AC,940℃/1 h/WQ+600℃/4 h/AC)than the national standard requirements(σ_(b)≥895 MPa,σ_(0.2)≥828 MPa,δ≥10%)for forgings.The fracture morphology is plastic.
作者 梁健慧 刘占起 王海江 尹桂丽 Liang Jianhui;Liu Zhanqi;Wang Haijiang;Yin Guili(School of Materials and Engineering,Liaoning University of Technology,Jinzhou 121ool,Liaoning,China)
出处 《应用激光》 CSCD 北大核心 2023年第10期61-68,共8页 Applied Laser
基金 辽宁省教育厅基础科研项目(LJKMZ20220960) 辽宁省博士启动科研项目(2023-BS-195)。
关键词 固溶时效 激光直接沉积 TC4钛合金 显微组织 拉伸性能 solution-aging laserdirect deposition Ti6Al4V alloy microstructure tensile property
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