Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
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Fatigue and mechanical properties of laser deposited maraging steel

레이저 적층 마레이징강의 기계적 특성 및 피로 특성

  • Hong, Seok-Kwan (Korea Institute of Industrial Technology, Molds & Dies R&D Group)
  • 홍석관 (한국생산기술연구원 금형기술그룹)
  • Received : 2018.10.12
  • Accepted : 2018.12.01
  • Published : 2018.12.01
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Abstract

Metal 3D printing is very useful for making the injection molds containing complex conformal cooling channels. The most important issue of the 3D printed molds is cost and life cycle. However, powder bed fusion (PBF) methods are vulnerable to fatigue loading because of the presence of pores and rough surfaces. In the present study, the fatigue test was performed to obtain fatigue analysis input data for predicting the durability of a 3D printed injection mold core. The metal 3D printer used to manufacture the specimen was OPM250L from Sodick, and the metal powder material was maraging steel. The ultrasonic fatigue testing method was adopted for the fatigue test. A key advantage of the ultrasonic fatigue method is that $10^8{\sim}10^9$ long cycle test data or more could be obtained within a relatively short period. Based on the results of the experiment, the effect of heat treatment was negligible. However, there was an apparent difference in durability depending on the presence or absence of the surface treatment.

Keywords

Acknowledgement

Supported by : 한국생산기술연구원

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