超硬質材料による表面硬化肉盛法の研究(第 3 報) : プラズマアーク肉盛溶接の割れ感受性に及ぼす送給炭化物の粒度と混合率の影響

概要

論文の詳細を見る
Effects of particle size and mixing rate of transition metal carbide NbC powder with austenitic stainless steel SUS 304L powder on the weld crack sensitivity in plasma arc overlay welding process have been studied. The following results were obtained. 1) Some part of NbC powder which is fed to molten pool is dissolved in matrix and solidifies as primary or eutectic carbide. Microscopic analysis shows that the volume of these crystallized NbC decreases as mixing rate of NbC increases, and that in the case of high mixing rate of small particle, the matrix contains less crystallized NbC than in the case of same mixing rate of large one. 2) The weld crack sensitivity overlay weld metal depends not only on mixing rate of NbC, but on its particle size. In the case of low mixing rate, overlay weld metal with small particle of NbC shows higher weld crack sensitivity than that of large one, while it shows lower weld crack sensitivity in the case of high mixing rate, which can be understood from the ductility of matrix depending on the volume of dissolved NbC.
1982-02-05