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11 低预热对接接头冲击断口中微孔及主裂纹的SEM像

Fig.11 SEM images of micro-voids and main crack of impact fracture of weld metal in low preheating temperature welding (Fig.11c is BSE image, the others are SE images) (a) SEM image of impact sample center, (b, c) observation region in Fig.11a (solid rectangle indicate deflection of main crack), (d) main crack extension around M-A (as shown in dotted rectangle region)