Microstructure Control and Tensile Properties of EBM γ-TiAl

CHEN Wei; YANG Yang

doi:10.16080/j.issn1671-833x.2017.1/2.037

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Microstructure Control and Tensile Properties of EBM γ-TiAl

更新时间：2025-10-30

- Microstructure Control and Tensile Properties of EBM γ-TiAl
- Aeronautical Manufacturing Technology Vol. 60, Issue 1/2, (2017)
- 作者机构：
  
  1. 中国科学院金属研究所,沈阳,110016
  2. 高能束流加工技术重点实验室,北京,100024
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671-833x.2017.1/2.037
  CLC：
- Published：2017
- 稿件说明：
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陈玮，杨洋，刘亮亮，陈哲源，刘冬. 电子束增材制造γ-TiAl显微组织调控与拉伸性能研究[J]. 航空制造技术, 2017, 60(1/2): 37-41. CHEN Wei1,2, YANG Yang2, LIU Liangliang3, CHEN Zheyuan2, LIU Dong3. Microstructure Control and Tensile Properties of EBM γ-TiAl. Aeronautical Manufacturing Technology, 2017, 60(1/2): 37-41.

CHEN Wei, YANG Yang. Microstructure Control and Tensile Properties of EBM γ-TiAl[J]. Aeronautical Manufacturing Technology, 2017, 60(1/2).
陈玮，杨洋，刘亮亮，陈哲源，刘冬. 电子束增材制造γ-TiAl显微组织调控与拉伸性能研究[J]. 航空制造技术, 2017, 60(1/2): 37-41. CHEN Wei1,2, YANG Yang2, LIU Liangliang3, CHEN Zheyuan2, LIU Dong3. Microstructure Control and Tensile Properties of EBM γ-TiAl. Aeronautical Manufacturing Technology, 2017, 60(1/2): 37-41. DOI： 10.16080/j.issn1671-833x.2017.1/2.037.

CHEN Wei, YANG Yang. Microstructure Control and Tensile Properties of EBM γ-TiAl[J]. Aeronautical Manufacturing Technology, 2017, 60(1/2). DOI： 10.16080/j.issn1671-833x.2017.1/2.037.

摘要

研究了电子束选区熔化增材制造Ti-48Al-2Cr-2Nb 合金的显微组织与拉伸性能。Al 含量的烧损导致显微组织呈现不均匀性，沉积态材料由较大的γ 晶粒和被α 2 晶粒钉扎的链状细小γ 晶粒组成。γ 相占据89% 的体积，但并未显示出明显织构；而α 2 相显示出14.1 倍随机值的(0001) 织构，其c 轴与沉积方向平行。沉积态材料的室温抗拉强度达到503MPa，而塑性为0。热等静压与热处理后的材料强度稍有下降，但延伸率获得较大改善。直到800℃，双态组织TiAl-4822 材料的抗拉强度仍在460MPa 以上，而全片层组织材料则维持在400MPa 以上。

Abstract

The microstructure evolution and tensile properties of electron beam selective melted Ti-48Al-2Cr-2Nb alloy were studied. The Al loss caused an inhomogeneous microstructure. The as-build material is composed of large γ grains and small γ grains pinned by a chain-like α2 grains. The γ phase occupies 89% of the material volume and exhibits a weak texture

but the α2 phase exhibits a 14.1 times random (0001) texture with its c axis parallel to the build direction. The room temperature tensile strength of the as-build material is 503MPa but the ductility is 0. HIP and heat treatment lowered the tensile strength but improved ductility by a large extent. Up until 800℃

the TiAl-4822 with a duplex microstructure exhibits tensile strength higher than 460MPa; while the TiAl-4822 with a fully lamella microstructure exhibits tensile strength higher than 400MPa.

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