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ERW 용접 전후 API X70 라인파이프강의 미세조직과 기계적 특성 변화
오동규 ( Dong-kyu Oh ),최예원 ( Ye-won Choi ),신승혁 ( Seung-hyeok Shin ),정한길 ( Han-gil Jeong ),곽진섭 ( Jin-sub Kwack ),황병철 ( Byoungchul Hwang ) 한국열처리공학회 2022 熱處理工學會誌 Vol.35 No.4
Variations in the microstructure and mechanical properties of API X70 steel processed by piping, electrical resistance welding (ERW), and post seam annealing (PSA) are investigated in this study. In the welding zone, some elongated pearlites are formed and grains coarsening occurs due to extra heat caused by the ERW and PSA processes. After the piping, the base metal shows continuous yielding behavior and a decrease in yield and impact strengths because mobile dislocation and back stress are introduced during the piping process. On the other hand, the ERW and PSA processes additionally decreased the impact strength of welding zone at room and low temperatures because some elongated pearlites easily act as crack initiation site and coarse ferrite grains facilitate crack propagation. As a result, the fracture surface of the welding zone specimen tested at low temperature revealed mostly cleavage fracture unlike the base metal specimen. (Received July 1, 2022; Revised July 25, 2022; Accepted July 28, 2022)