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Effects of post heat treatment on the microstructure and mechanical properties of wire arc additively manufactured Hastelloy C276 alloy

Journal Article


Abstract


  • Post-processing is often inevitable for most additively manufactured components in order to improve material properties and product quality. In this study, the influence of post-heat treatments (PHTs) at 871 °C and 1177 °C on the microstructure and mechanical properties of a nickel-base Hastelloy C276 alloy prepared using wire arc additive manufacturing (WAAM) were investigated. The results showed that after a PHT at 871 °C, the as-built alloy was strengthened due to the formation of a large amount of Mo-rich nano-sized μ phase in the interdendritic areas. This was at the expense of a significant ductility loss. In contrast, no μ phase precipitates were observed after PHT at 1177 °C. Furthermore, the 1177 °C treatment led to the dissolution of the Mo-rich p phase which was present in the as-built sample, increased solid-solution strengthening, and improvements in both strength and ductility concurrently. This study enables an improved understanding of post-processing-microstructure-property inter-relationships for Hastelloy C276 alloy prepared by WAAM, providing guidelines for further microstructure optimization through PHT to improve the material's mechanical properties.

UOW Authors


  •   Zhang, Jianrui (external author)
  •   Qiu, Zhijun (external author)
  •   Carpenter, Kristin (external author)
  •   Li, Hui Jun.
  •   Wexler, David
  •   Wu, Bintao (external author)

Publication Date


  • 2021

Citation


  • Qiu, Z., Wu, B., Wang, Z., Wexler, D., Carpenter, K., Zhu, H., . . . Li, H. (2021). Effects of post heat treatment on the microstructure and mechanical properties of wire arc additively manufactured Hastelloy C276 alloy. Materials Characterization, 177. doi:10.1016/j.matchar.2021.111158

Scopus Eid


  • 2-s2.0-85105490080

Web Of Science Accession Number


Volume


  • 177

Abstract


  • Post-processing is often inevitable for most additively manufactured components in order to improve material properties and product quality. In this study, the influence of post-heat treatments (PHTs) at 871 °C and 1177 °C on the microstructure and mechanical properties of a nickel-base Hastelloy C276 alloy prepared using wire arc additive manufacturing (WAAM) were investigated. The results showed that after a PHT at 871 °C, the as-built alloy was strengthened due to the formation of a large amount of Mo-rich nano-sized μ phase in the interdendritic areas. This was at the expense of a significant ductility loss. In contrast, no μ phase precipitates were observed after PHT at 1177 °C. Furthermore, the 1177 °C treatment led to the dissolution of the Mo-rich p phase which was present in the as-built sample, increased solid-solution strengthening, and improvements in both strength and ductility concurrently. This study enables an improved understanding of post-processing-microstructure-property inter-relationships for Hastelloy C276 alloy prepared by WAAM, providing guidelines for further microstructure optimization through PHT to improve the material's mechanical properties.

UOW Authors


  •   Zhang, Jianrui (external author)
  •   Qiu, Zhijun (external author)
  •   Carpenter, Kristin (external author)
  •   Li, Hui Jun.
  •   Wexler, David
  •   Wu, Bintao (external author)

Publication Date


  • 2021

Citation


  • Qiu, Z., Wu, B., Wang, Z., Wexler, D., Carpenter, K., Zhu, H., . . . Li, H. (2021). Effects of post heat treatment on the microstructure and mechanical properties of wire arc additively manufactured Hastelloy C276 alloy. Materials Characterization, 177. doi:10.1016/j.matchar.2021.111158

Scopus Eid


  • 2-s2.0-85105490080

Web Of Science Accession Number


Volume


  • 177