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강경필(Gyeong-pil Kang),곽은정(Eun-jeong Kwak),이승열(Seung-yeol Lee),유정목(Jeong-mog Yu),김병훈(Byung-hoon Kim) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
The proper heat treatment of tool steel is the most important process to achieve the peak of its performance. To do this, it is necessary to know exactly the history of temperature change inside the tool steel during heat treatment. The numerical simulation can be an efficient way than measuring temperature directly with thermocouple for the every size and shape of tool steel. However, it’s not an easy work and is very expensive in time and cost to get a reliable data such as heat transfer coefficient of medium, material properties of each phase, and the transformation kinetics between phases involved. Here we introduce the process how to obtain these input values more efficiently for the quenching simulation.
초합금 디스크 부품의 열처리 잔류응력 예측을 위한 전산모사 연구
곽은정(Eun-jeong Kwak),강경필(Gyeong-pil Kang),홍성석(S. S. Hong),우완측(Wan-Chuck Woo) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
The turbine disk is exposed to a high temperature and high pressure environment. The residual stress needs to be controlled below certain level to ensure the high reliability during the service. The residual stress is developed mostly during the heat treatment of quenching and aging. The numerical simulation of heat treatment process can be a useful tool to optimize the material property and process condition. In this study, the heat transfer coefficients of each medium, air and oil, are obtained by experiment coupled with optimization technique and the material properties are obtained by JMatPro which calculates the high temperature material properties. The numerical simulation is performed and the estimated residual stress distribution in each heat treatment stage is shown