The Microstructure of Iron Base Binary Weld Metals (Report 2):Effect of ferrite formers
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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.<BR>The results obtained are summarized as follows:<BR>(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.<BR>(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.<BR>(3) The solidification structure of Fe-Zr weld metals changes from equiaxed to cell structure and further to cellular dendrite with increasing zirconium content.<BR>(4) The segregation of alloying element is observed on sub-boundaries of the cell structure and cellular dendrite in Fe-Zr weld metals.<BR>(5) The solidification structure is disarranged during cooling through the γ-loop.<BR>(6) Concentration gradients of alloying elements of 10 to l00μ width are observed.near fusion lines.<BR>(7) The alloying elements in weld metals appear to diffuse into unmelted base metal from 5 to 10 μ.<BR>(8) The macroscopic segregations of alloying elements are not seen in the weld metals.
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