Powder Bed Fusion(PBF) 공정의 Laser rotation 적용 여부에 따른 17-4PH 스테인리스강 소재의 미세조직 및 기계적 특성 변화 (Changes in Microstructure and Mechanical Properties of 17-4PH Stainless Steel according to the Application of Laser Rotation in the Powder Bed Fusion(PBF) Process)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 61권 / 6호 / 397 ~ 403페이지
· 저자명 : 이승호, 윤종천, 어두림, 연시모, 최균석

초록

17-4 precipitation hardened stainless steel (17-4PH SS) has been reported to have excellentmechanical properties and excellent corrosion resistance, and is one of the materials used and studied withthe powder bed fusion (PBF) method. Powder bed fusion (PBF) is a new manufacturing technology that hasrecently attracted attention in automotive, aerospace and other industries because of its ability to producecomplex geometries for high-strength and lightweight applications. In the PBF process, each layer has adifferent laser scan length resulting from the application of laser rotation. The laser rotation could affect thelaser 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 thePBF process affects the microstructure and mechanical properties of 17-4PH SS. A decrease in cooling ratewas observed after applying laser scan rotation, resulting in a higher austenite phase fraction. It wasconfirmed 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 powderbed fusion process using the 17-4PH SS.

영어초록

17-4 precipitation hardened stainless steel (17-4PH SS) has been reported to have excellentmechanical properties and excellent corrosion resistance, and is one of the materials used and studied withthe powder bed fusion (PBF) method. Powder bed fusion (PBF) is a new manufacturing technology that hasrecently attracted attention in automotive, aerospace and other industries because of its ability to producecomplex geometries for high-strength and lightweight applications. In the PBF process, each layer has adifferent laser scan length resulting from the application of laser rotation. The laser rotation could affect thelaser 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 thePBF process affects the microstructure and mechanical properties of 17-4PH SS. A decrease in cooling ratewas observed after applying laser scan rotation, resulting in a higher austenite phase fraction. It wasconfirmed 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 powderbed fusion process using the 17-4PH SS.

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