鉄基二元合金溶接金属の組織に関する研究(第 2 報) : フェライト形成合金元素の場合

概要

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Microscopic survey, measurement of grain size and electron probemicroanalysis of Fe-Al, Fe-Cr, Fe-W, Fe-V, Fe-Si, Fe-Ti Fe-Mo and Fe-Zr weld metals were performed. The results obtained are summarized as follows : (1) The solidification structure of Fe-Al, Fe-Cr, Fe-W, Fe-V or Fe-Si weld metals changes from equiaxed to columnar crystal with increasing contents of alloying elements. (2) The solidification structure of Fe-Ti weld metals changes from equiaxed to columnar crystal and again to equiaxed crystal attended with the segregation of titanium. (3) The solidification structure of Fe-Zr weld metals changes from equiaxed to cell structure and further to cellular dendrite with increasing zirconium content. (4) The segregation of alloying element is observed on sub-boundaries of the cell structure and cellular dendrite in Fe-Zr weld metals. (5) The solidification structure is disarranged during cooling through the γ-loop. (6) Concentration gradients of alloying elements of 10 to 100μ width are observed near fusion lines. (7) The alloying elements in weld metals appear to diffuse into unmelted base metal from 5 to 10μ. (8) The macroscopic segregations of alloying elements are not seen in the weld metals.
社団法人溶接学会の論文
1970-02-25