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J. Ocean Eng. Technol. 2008;22(6):27-34.    

Evaluation of Characteristic for SS400 and STS304 Steel by Weld Thermal Cycle Simulation - 3rd Report: Residual Stress and Ultrasonic Parameter
Ahn Seok-Hwan,Choi Moon-Oh,Jeong Jeong-Hwan,Kim Sung-Kwang,Nam Ki-Woo
School of Mechanical Engineering Pukyong National University,Busan Fire Services,Korea Institute of Ceramic Engineering and Technology,Defence Agency for Technology and Quality,Division of Materials Science and Engineering Pukyong National University
용접열사이클 재현에 의한 SS400강 및 STS304강의 특성 평가 - 제3보: 잔류응력과 초음파 파라미터
안석환,최문오,정정환,김성광,남기우
부경대학교 기계공학부,부산소방본부,요업기술원,국방기술품질원,부경대학교 신소재공학부
© 2008 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Weld thermal cycle simulation, Thermal stress, X-ray diffraction, Ultrasonic parameter, Residual stress
핵심용어: 용접열사이클 재현, 열응역, X-선 회절, 초음파 파라미터, 잔류응력
Abstract
The temperature distribution in the weldment is not uniform because a weldment is locally heated. Thermal plastic deformation results from the local expansion and shrinkage by the heating and cooling of metal. Therefore, residual stresses and distortion occur in the weldment. In this study, we had conducted on the weld thermal cycle simulation that is supposed as the HAZ on SS400 steel and STS304 steel. The residual stresses that were obtained from the drawing and the weld thermal cycle simulation were estimated by X-ray diffraction. We also carried out ultrasonic test for the weld thermal cycle simulated specimens, and then conducted on nondestructive evaluation by the ultrasonic parameters obtained ultrasonic test. From the results, residual stresses of weld thermal cycle simulated specimens after the residual stress removal heat treatment are lower than that of the drawing.


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