高强钢焊缝金属强韧性研究进展

曹睿, 刘梓申

Research Progress on the Strength and Toughness of High-Strength Steel Weld Metal

CAO Rui, LIU Zishen

图5 B含量对高强钢焊缝金属显微组织和强韧性的影响[65]

Fig.5 Effects of B content on the microstructure, strength, and toughness of high-strength steel weld metals[65] (Samples with B mass fractions of 0.008%, 0.0020%, 0.0031%, 0.0042%, 0.0057%, and 0.0087% were designated as B08, B20, B31, B42, B57, and B87, respectively) (a1-a4) positive ion distributions of carbon-containing and oxygen-containing composite anion of B87 (PAGB—prior austenite grain boundary. White arrows in Figs.5a2 and a4 indicate B-carbide and B-oxide, respectively)(b1-b6) microstructures (b1-b3) and EBSD images showing the high-angle grain boundary (b4-b6) of weld metals in samples B08 (b1, b4), B42 (b2, b5), and B87 (b3, b6) (M-A—martensite-austenite) (b7) misorientation angle distributions of the weld metals with different B contents (RZ—reheated zone) (b8) grain size distributions of weld metals with different B contents (c1-c3) mechanical properties of weld metals with different B contents (c1) ductile-brittle transition curve (c2) ductile-brittle transition temperature (c3) micro-hardness (CGZ—columnar grain zone)