鉄基二元合金溶接金属の組織に関する研究(第1報)

オーステナイト形成型合金元素の場合

抄録

Microscopic survey, measurement of grain size and electron probe microanalysis of Fe-Ni, Fe-Cu, Fe-Mn and Fe-C weld metals were performed.
The results obtained are summerized as follows;
(1) In Fe-Mn, Fe-Ni and Fe-Cu weld metals, the solidification structure changes from equiaxed to columnar crystal and still to cell structure with increasing the contents of alloying elements.
(2) In Fe-C weld metals, the solidification structure changes from equiaxed to columnar crystal with a small amount of carbon.
(3) The segregation of alloying elements are observed in the cell boundaries.
(4) The solidification structure of the weld metals is disarranged by peritectic reaction.
(5) The concentration gradients of alloying elements are observed in the weld metals of 26 to 108 μ width near the fusion lines.
(6) The alloying elements appear to diffuse into unmelted base metal about 5 to 10 μ.
(7) The macroscopic segregation of alloying element is observed only in Fe-Ni weld metals.