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안규백(Gyubaek An),한일욱(Illwook Han),박정웅(Jeongung Park),우완측(Wan Chuck Woo) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.6
As the recession in shipbuilding industry became longer, domestic shipbuilders focused on the need for high value added and high technology, and strived to build safer vessels. There are LNG carriers and container ships that require representative technologies. Both ship types are rapidly increasing ship size in the 2000s. Recently, there have been the increase of ship size and the development of oil and gas in arctic region. These trends have led to the requirements such as high strength, good toughness at low temperature and good weldability for prevent of brittle fracture at service temperature. Studies on unstable fracture have mainly been conducted to evaluate the brittle crack stopping properties of the high strength steel welded joints through large scale fracture tests, and studies on the difficulty of stopping brittle cracks in welded joints. It is known that BCA (Brittle Crack Arrest) steel has recently been developed to prevent unstable fracture if cracks propagate toward the BCA steel even if brittle cracks occur. Therefore, it is considered that the ship can be dried more easily if a technology capable of inducing the brittle crack to the BCA steel is developed. In this study, we describe a technique for securing unsafe fracture safety by inducing cracks toward the BCA steel, which has excellent brittle crack stopping ability, regardless of the welding process when brittle cracks occur in the superstructure of super large container ships.
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