16. 熔着鋼の線状破面に關する研究(第 1 報)

概要

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On micro-fissures sometimes found in mild steel are welds, the authors observed maeroscopically the appearance of fractures of the fissures, and carried out chemical analysis, microstructure test, and cementation test, etc. as to welds revealing microfissures. They concluded from these experiments as follows : Fracture of the fissure consisted of columnar structure comparatively fine and oriented straightly and almost perpendicularly to the weld line. The cause of this structure seems to be super cooling of molten metal. Micro-fissures were intercrystalline ones which developed along the primary crystal boundary by dint of shrinkage stress at higher temperature above the A_3 transformation point. This intercrystalline fissuring is considered to have been fostered by particles of SiO_2 which were on the boundary, and it was found that Mn/Si in deposits greatly affected the occurrence of the fissures.
社団法人溶接学会の論文
1948-07-01