Microstructure Evolution and High-Temperature Mechanical Properties of Ti6Al4Nb4Zr Fabricated by Selective Laser Melting

Tomoki Kuroda, Haruki Masuyama, Yoshiaki Toda, Tetsuya Matsunaga, Tsutomu Ito, Makoto Watanabe, Ryosuke Ozasa, Takuya Ishimoto, Takayoshi Nakano, Masayuki Shimojo, Yoko Yamabe-Mitarai

研究成果: Article査読

抄録

Ti6Al4Nb4Zr (mass%) was prepared by selective laser melting (SLM) under various conditions, and the microstructure evolution resulting from SLM processing and subsequent heat treatments was investigated. The effects of the unique SLM-induced microstructure on the high-temperature compressive strength and creep properties of the samples were then elucidated. Under rapid cooling conditions, the martensitic structure formed in a scale-like pattern, with a 100 µm in size, consistent with the laser scanning pattern. By contrast, under slow cooling conditions, the ¡/¢ lamellar structure formed in ¢ grains with a 300 µm grain size instead of in a scale-like pattern. The martensitic structure drastically changed to a Widmanstätten structure during heat treatment. The equiaxed ¡ phase also formed at the interface of the scale-like patterns. By contrast, the ¡/¢ lamellar structure did not exhibit a change in response to heat treatment. The compressive strength of the SLM samples was governed by the martensite ¡ size and the grain size, both of which depended on the cooling rate. The dominant creep deformation mechanism at 600°C and under a loading stress of 137 MPa was grain boundary sliding. The creep life depended on the grain size. The HIP treatment improved the creep life because it eliminated pores introduced by the SLM process.

本文言語English
ページ(範囲)95-103
ページ数9
ジャーナルMaterials Transactions
64
1
DOI
出版ステータスPublished - 2023

ASJC Scopus subject areas

  • 材料科学一般
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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