预热对690 MPa级HSLA钢对接接头力学性能的影响

汤忖江, 安同邦, 彭云, 马成勇, 林纯丞, 石照夏, 秦哲

Effect of Preheating on Microstructure and Mechanical Properties of Butt Joint of 690 MPa Grade HSLA Steel

TANG Cunjiang, AN Tongbang, PENG Yun, MA Chengyong, LIN Chuncheng, SHI Zhaoxia, QIN Zhe

图4 不预热和低预热对接接头的微观组织形貌的OM像

Fig.4 OM images of non-preheating and low preheating temperature butt joints (dashed line indicate boundary of fusion zone, the same below) (a, b) weld metals, (c, d) fusion zones, (e, f) coarse grain regions in HAZ (FZ—Fusion zone, CG—Coarse grain region, GBF—Grain boundary ferrite, PCGB—Prior columnar grain boundary, AF—Acicular ferrite, B—Bainite, LB—Lath bainite, CB—Coalesced bainite)