690 MPa级高强韧低碳微合金建筑结构钢设计及性能
朱雯婷1, 崔君军1, 陈振业1,2, 冯阳1, 赵阳3, 陈礼清1(
)
)
Design and Performance of 690 MPa Grade Low-Carbon Microalloyed Construction Structural Steel with High Strength and Toughness
ZHU Wenting1, CUI Junjun1, CHEN Zhenye1,2, FENG Yang1, ZHAO Yang3, CHEN Liqing1()
)
图12. 实验用钢在不同温度下1/4厚度处冲击断口附近形貌和裂纹扩展的SEM像
(a) 20oC (b, c) -20oC (d, e) -40oC (f) -60oC
Fig.12. SEM fractographs of the tested steel at 1/4 thickness showing morphologies and cracks propagation paths (showed by white arrows) underneath the fracture surface at different impact temperatures (Area I in Fig.12b indicates microcrack was formed by the aggregation of microvoids, area II Fig.12b indicates the growth of microcrack was obstructed by lath-like bainite)
