440 MPa级高强钢焊缝金属的断裂韧性

曾道平, 安同邦, 郑韶先, 代海洋, 曹志龙, 马成勇

Fracture Toughness of Weld Metal of 440 MPa Grade High-strength Steel

ZENG Daoping, AN Tongbang, ZHENG Shaoxian, DAI Haiyang, CAO Zhilong, MA Chengyong

图12 -40℃冲击断口纵剖面上的裂纹扩展形貌

Fig.12 Crack propagation morphology on the longitudinal section of the imapact fracture at -40oC (a) schematic diagram of observation position, (b) effect of AF on main crack growth, (c) high magnification image of the area in Fig.b, (d) secondary crack propagation in AF, (e) effect of QF on crack growth; (f) high magnification image of the area in Fig.e, (g) M-A constituent induced microcrack