关键词: 焊接接头, 马氏体-奥氏体组元形态, 热影响区, 韧性, 图象处理, 多材料汽车车身, 固相焊, 机械连接, 胶接, 轻量化, 熔钎焊, 异质材料连接

Abstract: The morphological effect of martensise-austenite (M-A) constituents in weld coarse grained heat affected zone (CGHAZ) on the toughness is studied quantitatively with a binary image processor for high strength steel. The results show that the volume fraction of the slender M-A constituents SVf affected the toughness. The toughness was degraded remarkably with the increase of SVf value, but this harm of slender particles was eliminated as SVf value excceed a particular value because of the vicinity effect.

Key words: HAZ, Image processor, Morphology of M-A constituent, Toughness, Welded joint, Adhesive bonding, Dissimilar material joining, Mechanical joining, Multi-material vehicle body, Solid-state welding, Welding-brazing, Lightweighting