Effect of Post-Weld Heat Treatment Conditions on Mechanical Properties, Microstructures and Nonductile Fracture Behavior of SA508 Gr.1a Thick Weldments

Junsang Lee; Jong Sung Kim; Bongsang Lee; Sungwoo Cho; Dongil Kwon; Jong‑hyoung Kim

doi:10.1007/s12540-021-01090-8

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자료유형: 학술저널

저자정보: Junsang Lee (Seoul National University) Jong Sung Kim (Sejong University) Bongsang Lee (Korea Atomic Energy Research Institute) Sungwoo Cho (Doosan Heavy Industries and Construction Co. Ltd.) Dongil Kwon (Seoul National University) Jong‑hyoung Kim (Seoul National University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.11

발행연도: 2021.11

수록면: 4,700 - 4,709 (10page)

DOI: 10.1007/s12540-021-01090-8

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This study analyzes the effects of post-weld heat treatment (PWHT) on the mechanical properties and microstructures ofSA-508 Gr.1a welds and proposes a new PWHT exemption criterion based on nonductile fracture evaluation consideringwelding residual stress. The welding coupons were prepared with submerged-arc welding, gas-tungsten arc welding, andshielded-metal arc welding, using ferritic steel, SA-508 Gr.1a. The microstructure of the heat-affected zone (HAZ) was analyzedusing optical microscopy, electron-back-scatter diffraction and Vickers hardness testing. The mechanical propertiesof the welds were evaluated by uniaxial tensile test, transverse side bend test, Charpy V-notch impact test and side bend test. Bainite and ferrite structures formed mainly in the HAZ, and the grain size became coarser with proximity to the surfaceand fusion line. The mechanical properties did not depend strongly on PWHT, weldment thickness or welding techniques,and they satisfied the welding procedure qualification test specified in the ASME Boiler & Pressure Vessel code. Weldingresidual stresses were considered in assessing structural integrity using nonductile fracture evaluation. A margin of safetyagainst nonductile fracture with residual stress was calculated for Korean Standard Nuclear Power Plant steam-generatorwelds, using its design parameters and operating conditions, and this safety margin is suggested as an acceptance criterionfor residual stress for exemption from PWHT.

#SA-508 Gr.1a #Post-weld heat treatment #Mechanical properties #Microstructure #Residual stress #Nonductile fracture

참고문헌 (30)

참고문헌 신청

V. D. Vijayanand / 2014 / Mater. Sci. Eng. A 607:138

Y. Fan / 2020 / J. Nucl. Mater 538:152239

J.R. Cho / 2004 / J. Mater. Process. Tech. 155?156:1690

M. Mochizuki / 2007 / Nucl. Eng. Des 237:107

J. Katsuyama / 2013 / J. Press. Vess. Technol. 135:51402

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Junsang Lee

소속기관 서울대학교

주요연구분야 공학 > 재료·에너지공학 > 재료공학 공학 > 기계공학 > 기계공학 일반

논문수 3 이용수 21

Jong Sung Kim

소속기관 세종대학교