콘텐츠 본문
논문 해외 국제전문학술지(SCI급) Normalizing effect of heat treatment processing on 17-4 PH stainless steel manufactured by powder bed fusion
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2022-04
- 저자명 SM Yeon, J Yoon, TB Kim, SH Lee, TS Jun, Y Son, K Choi*
- 발행처명 Metals
- 발행국가 해외
- 논문언어 외국어
논문 초록 (Abstract)
Laser powder bed fusion (L-PBF)-processed 17-4 PH stainless steel (SS) generally exhibits a non-equilibrium microstructure consisting mostly of columnar δ-ferrite grains and a substantial fraction of retained austenite and martensite, contrary to 17-4 PH SS wrought with a fully martensite structure and coarse grains. Despite the different microstructures of L-PBF and wrought 17-4 PH SS, post-processing is typically performed using the conventional heat treatment method. The insufficient effect of the heat treatment on the L-PBF product produces a δ-ferrite phase in the microstructure. To obtain improved mechanical properties, the addition of a normalizing treatment to the conventional heat treatment after L-PBF in a nitrogen gas environment was investigated. The fully martensitic matrix developed by adding the normalizing treatment contained homogeneous Cu precipitates and exhibited a similar or improved strength and elongation to failure compared to the wrought SS.
