等离子电弧双丝增材制造Ti-48Al合金组织特征

王林; 华学明; 沈忱; 张跃龙; 李芳; 周雯露; 丁煜瀚

doi:10.12073/j.hjxb.20230309001

等离子电弧双丝增材制造Ti-48Al合金组织特征

上海交通大学，上海市激光制造与材料改性重点实验室，上海, 200240

基金项目: 国家自然科学基金“联合基金项目”(No.U1937601)；上海市2019年度“科技创新行动计划”高新技术领域项目(19511106400)；上海市科学技术委员会“扬帆计划项目”(19YF1422700).

详细信息

作者简介:
王林，博士研究生；主要从事电弧增材制造、激光焊接方面的研究工作；E-mail：wanglin1@sjtu.edu.cn

通讯作者:
华学明，博士，教授，博士研究生导师；E-mail: xmhua@sjtu.edu.cn

中图分类号: TG 444.4
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出版历程
- 收稿日期: 2023-03-08
- 网络出版日期: 2023-11-20
- 刊出日期: 2024-02-24

Investigation on microstructure characteristics of Ti-48Al alloy fabricated using twin-wire directed energy deposition-plasma arc

Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

摘要

摘要:
采用等离子电弧双丝增材制造技术成功制备了Ti-48Al合金(at.%)，并对其沉积态和热处理后的组织特征进行了系统地研究. 结果表明，沉积态Ti-48Al合金主要由α₂相和γ相组成，沿着沉积方向，沉积态组织呈现由树枝晶区和片层晶团区交替分布的不均匀性特征，并且在树枝晶区存在严重的枝晶间Al元素偏析现象. 在1340 ℃/10 h/炉冷热处理后，不均匀的沉积态组织转变为晶粒尺寸细小的双态组织，Ti-48Al合金的微观组织的不均匀性获得明显改善，并且α₂相含量显著增加，组织的择优取向减弱.
- 电弧增材制造 /
- TiAl合金 /
- 微观组织 /
- 热处理
Abstract:
Ti-48Al alloy is fabricated successfully using plasma arc powred twin wire-directed energy deposition-arc, and its microstructure characteristic before and after heat treatment is systematically investigated. The results show that as-deposited Ti-48Al alloy consists of α₂ and γ phase. The microstructure is characterized by the alternatively distributed dendritic grain and fully lamellar colony along the building direction for as-deposited Ti-48Al alloy, and there is interdendritic Al element segregation in the dendritic grain region. After heat treatment in 1340 ℃/10 h/furnace cooling, the duplex microstructure with fine grain size is obtained, and the microstructure heterogeneity is significantly improved, the α₂ phase content is obviously increased, the preferred orientation of microstructure is also weakened.
- directed energy deposition-arc /
- TiAl alloy /
- microstructure /
- heat treatment

HTML全文

图 1 等离子电弧双丝增材制造系统示意图

Figure 1. Schematic of twin wire-plasma arc additive manufacturing system

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图 2 Ti-48Al合金沉积件

Figure 2. As-deposited TiAl alloy component

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图 3 Ti-Al二元合金相图^[23]

Figure 3. Ti-Al binary phase diagram

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图 4 沉积态Ti-48Al合金试样横截面(x-z)的组织特征

Figure 4. Microstructure on the cross section (x-z) of as-deposited Ti-48Al alloy. (a) macrostructure morphology; (b) microstructure in the top a region; (c) the banded structure in the middle b region; (d) the dendritic grain microstructure; (e) the fully lamellar colony microstructure

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图 5 沉积态Ti-48Al合金树枝晶区能谱面扫描结果

Figure 5. EDS in dendritic grain region of as-deposited Ti-48Al alloy

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图 6 在1340 ℃/10 h/炉冷热处理后的增材制造Ti-48Al合金的微观组织

Figure 6. Microstructure of additively manufactured Ti-48Al alloy after heat treatment at 1340 ℃/10 h/furnace cooling

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图 7 热处理前后增材制造Ti-48Al合金试样的XRD

Figure 7. XRD results of additively manufactured Ti-48Al alloy before and after heat treatment

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图 8 热处理前后增材制造Ti-48Al合金试样的取向分布

Figure 8. The orientation distribution of additively manufactured Ti-48Al alloy before and after heat treatment. (a) as-deposited; (b) heat-treated

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图 9 热处理前后增材制造Ti-48Al合金试样的γ相{111}极图

Figure 9. The pole figure γ{111} of additively manufactured Ti-48Al alloy before and after heat treatment. (a) as-deposited; (b) heat-treated

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