| 热处理对激光立体成形TB18钛合金组织和力学性能的影响 |
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| 引用本文： | 张颖,王浩军,陈素明,胡广,欧阳德来,崔霞,胡生双. 热处理对激光立体成形TB18钛合金组织和力学性能的影响[J]. 金属热处理, 2022, 47(3): 124-129. DOI: 10.13251/j.issn.0254-6051.2022.03.024 |
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| 作者姓名： | 张颖 王浩军 陈素明 胡广 欧阳德来 崔霞 胡生双 |
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| 作者单位： | 1.中航西安飞机工业集团股份有限公司, 陕西 西安 710089;2.西安铂力特增材技术股份有限公司, 陕西 西安 710000;3.南昌航空大学 材料科学与工程学院, 江西 南昌 330063 |
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| 基金项目： | 国家自然科学基金(51761029,51864035)； |
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| 摘 要： | 采用BLT-C1000型激光立体成形设备制备了沉积态的TB18钛合金,然后采用OM、SEM和拉伸试验机等方法研究了不同热处理工艺对TB18钛合金显微组织和力学性能的影响。结果表明,沉积态试验合金的宏观组织以长条形β晶粒为主,晶内由亚稳β相和针状次生α相组成,且存在贯穿β晶粒的沉积层线。随着直接时效温度的升高,原始β晶粒形状变化不大,内部次生α相厚度增加,在形貌上次生α相从针状向片状转变。直接时效温度高于550 ℃时,沉积层线消失,直接固溶温度高于830 ℃时显微组织以全β晶粒组成。固溶+时效处理后,微观组织以纵横交错的细层片状α相为主。随着直接时效温度的升高,抗拉强度和屈服强度降低,伸长率增加。固溶+时效后析出次生α相,抗拉强度和屈服强度显著增加,同时伸长率下降。综合考虑,实际生产中沉积态的TB18钛合金的最佳热处理工艺为直接时效500 ℃×4 h,此时强度和伸长率均高于指标要求。
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| 关 键 词： | 激光立体成形 TB18钛合金 热处理 组织 性能 |
| 收稿时间： | 2021-11-14 |
Effect of heat treatment on microstructure and mechanical properties of laser solid forming TB18 titanium alloy |
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| Zhang Ying,Wang Haojun,Chen Suming,Hu Guang,Ouyang Delai,Cui Xia,Hu Shengshuang. Effect of heat treatment on microstructure and mechanical properties of laser solid forming TB18 titanium alloy[J]. Heat Treatment of Metals, 2022, 47(3): 124-129. DOI: 10.13251/j.issn.0254-6051.2022.03.024 |
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| Authors: | Zhang Ying Wang Haojun Chen Suming Hu Guang Ouyang Delai Cui Xia Hu Shengshuang |
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| Affiliation: | 1. AVIC Xi'an Aircraft Industry Group Company Ltd., Xi'an Shaanxi 710089, China; 2. Xi'an Bright Laser Technologies Company Ltd., Xi'an Shaanxi 710000, China; 3. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang Jiangxi 330063, China |
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| Abstract: | As-deposited TB18 titanium alloy was prepared by using BLT-C1000 laser solid forming equipment, and then the effects of different heat treatment processes on microstructure and mechanical properties of the TB18 titanium alloy were studied by means of OM, SEM and tensile testing machine. The results show that the macrostructure of the as-deposited tested alloy is dominated by elongated β grains, which are composed of metastable β phases and acicular secondary α phases, and there are deposited layer lines running through the β-grains. With the increase of direct aging temperature, the shape of the original β grains changes a little, the thickness of the internal secondary α phases increases, and the morphology of secondary α phases changes from needle-like to flake-like. When the direct aging temperature is higher than 550 ℃, the deposition layer line disappears, and the microstructure is composed of all β grains at the direct solution temperature higher than 830 ℃. After solution and aging treatments, the microstructure mainly consists of crisscross fine lamellar secondary α phase. With the increase of direct aging temperature, the tensile strength and yield strength decrease and the elongation increases. The secondary α phase is precipitated after solution and aging treatments, and the tensile strength and yield strength increase significantly, while the elongation decreases. By comprehensive consideration, the optimal heat treatment process of the as-deposited TB18 titanium alloy in actual production is direct aging at 500 ℃ for 4 h, at which the strength and elongation are higher than the index requirements. |
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| Keywords: | laser solid forming TB18 titanium alloy heat treatment microstructure mechanical properties |
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