콘텐츠 본문
논문 국내 국제전문학술지(SCI급) Powder Bed Fusion(PBF) 공정의 Laser rotation 적용 여부에 따른 17-4PH stainless steel 소재의 미세조직 및 기계적 특성 변화
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2023-06
- 저자명 이승호， 윤종천， 어두림， 연시모， 최균석*
- 발행처명 대한금속재료학회지
- 발행국가 국내
- 논문언어 외국어
논문 초록 (Abstract)
17-4 precipitation hardened stainless steel (17-4PH SS) has been reported to have excellent mechanical properties and excellent corrosion resistance, and is one of the materials used and studied with the powder bed fusion (PBF) method. Powder bed fusion (PBF) is a new manufacturing technology that has recently attracted attention in automotive, aerospace and other industries because of its ability to produce complex geometries for high-strength and lightweight applications. In the PBF process, each layer has a different laser scan length resulting from the application of laser rotation. The laser rotation could affect the laser scan length, which causes a difference in the peak temperature and cooling rate of the deposited layer, resulting in microstructure changes. This work aims to investigate how varying the laser scan pattern in the PBF process affects the microstructure and mechanical properties of 17-4PH SS. A decrease in cooling rate was observed after applying laser scan rotation, resulting in a higher austenite phase fraction. It was confirmed that a transformation induced plasticity (TRIP) phenomenon affects mechanical characteristics. These results could be suggested for fabricating thin wall shaped such as tire blow mold parts in the powder bed fusion process using the 17-4PH SS.
