| Autor: |
Guangyuan Wang, Liuqing Yang, Guohong Dai, Congping Chen, Yaodong Xuanyuan, Wangping Wu, Yuan Qin, Sen Yang |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Journal of Materials Research and Technology, Vol 33, Iss , Pp 7182-7192 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2238-7854 |
| DOI: |
10.1016/j.jmrt.2024.11.119 |
| Popis: |
In this paper, the non-weldable precipitation-hardened superalloy Inconel 738 thin-wall parts were fabricated by laser directed energy deposition (LDED). The influence of post heat treatments including solution and aging heat treatments on the microstructures and mechanical properties of LDED-manufactured IN738 parts were investigated. The research results show that the phase composition of as-built and heat-treated IN738 alloys consisted of γ/γ’ and MC carbide. The microstructure of as-built IN738 alloy included fine columnar dendrites with a strong fibre texture parallel to the build direction. The smallest size of γ′ precipitates in the matrix led to the highest hardness value. By applying the post-heat treatment of 1120°C-2h+850°C-24 h, intense dislocation lines formed the network around the cuboidal γ′ precipitates. Moreover, the elongation of transverse and longitudinal tensile specimens reached the highest value of 26% and 17.4% respectively. With the increase of solution temperature, the fine columnar dendrites gradually enlarged along the direction vertical to the building direction. When the solution temperature increased to 1270 °C, the elongation of samples decreased obviously due to the enlarged columnar grains and the disappearance of dislocation network. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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