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| 电弧增材制造TC4微观组织调控及力学性能研究 |
| Microstructure Regulation and Mechanical Properties of TC4 Titanium Alloy by Wire Arc Additive Manufacturing |
| Received:February 21, 2024 |
| DOI：10.3969/j.issn.1674-6457.2024.05.013 |
| 中文关键词: TC4钛合金 电弧增材制造 固溶时效处理 微观组织 力学性能 |
| 英文关键词: TC4 titanium alloy wire arc additive manufacturing solid solution aging treatment microstructure mechanical properties |
| 基金项目:国家自然科学基金(52175326);江西省科技厅项目(20212AEI91004) |
| Author Name | Affiliation | | WANG Yike | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China | | LI Renhua | AVIC Hongdu Aviation Industry Group, Nanchang 330213, China | | CHEN Yuhua | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China | | XU Mingfang | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China | | CHEN Wei | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China |
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| 中文摘要: |
| 目的 研究固溶时效处理对电弧增材制造TC4钛合金微观组织和力学性能的影响规律。方法 设置了1组时效处理(AT，600 ℃/2 h/空冷)和2组固溶+时效处理(SA1，800 ℃/1 h/炉冷+600 ℃/2 h/空冷;SA2，870 ℃/1 h/炉冷+600 ℃/2 h/空冷)策略，对电弧增材制造TC4钛合金进行了热处理试验。通过扫描电镜(SEM)进行微观组织形貌和断口形貌观察，通过拉伸试验机进行室温力学性能测试。结果 沉积态试样的微观组织均匀性较差，主要由马氏体α¢相、网篮组织、不连续的晶界α相(α Grain Boundary，αGB)和集束组织构成。AT并未完全消除马氏体α¢相，但提高了其延展性。经固溶+时效处理后，马氏体α¢相消失，晶粒内部主要由网篮组织和αGB组成。平均抗拉强度由沉积态的999.67 MPa降低到SA2的936.46 MPa，而平均延伸率从6.23%提高到12.48%，且SA2样品显示出更低的力学性能各向异性。其中沉积态试样抗拉强度、屈服强度和延伸率的各向异性值(IPA)分别为4.82、0.96和28.7。SA2试样抗拉强度、屈服强度和延伸率的IPA分别为0.3、0.42和5.56。结论 固溶时效处理有助于提高电弧增材制造TC4钛合金微观组织均匀性，并显著降低力学性能的各向异性。 |
| 英文摘要: |
| The work aims to study the effects of solid solution aging treatment on the microstructure and mechanical properties of the wire arc additive manufacturing (WAAM) TC4 titanium alloy. A group of aging treatment (AT, 600 ℃/2 h/air cooling) and two groups of solid solution+aging treatment (SA1, 800 ℃/1 h/furnace cooling+600 ℃/2 h/air-cooling; SA2, 870 ℃/ 1 h/furnace cooling+600 ℃/2 h/air cooling) were set up to carry out the heat treatment test on the WAAM TC4 titanium alloys, and then the microstructure and the fracture morphology were observed by scanning electron microscopy (SEM), and the mechanical properties at room temperature were tested by tensile testing machine. The results showed that the microstructure of the as-deposited samples was poorly homogeneous and mainly consisted of martensite α¢ phase, basketweave, discontinuous grain boundary α phase (αGB) and α colonies. AT did not completely eliminate the martensite α¢ phase, but improved the ductility. After solid solution + aging treatment, the martensite α¢ phase disappeared and the grain interior consisted mainly of basketweave and αGB. The average tensile strength decreased from 999.67 MPa to 936.46 MPa, whereas the average elongation increased from 6.23% to 12.48%, and the SA2 sample showed lower anisotropy of the mechanical properties. The index of plane anisotropy (IPA) of ultimate tensile strength, yield strength and elongation of the AB samples were 4.82, 0.96 and 28.7, respectively. The IPA of tensile strength, yield strength and elongation of the SA2 samples were 0.3, 0.42 and 5.56, respectively. Thus, the solid solution aging treatment helps to improve the microstructure homogeneity of TC4 titanium alloy fabricated by WAAM and significantly reduces the anisotropy of mechanical properties. |
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