二相ステンレス鋼のキャビテーション壊食にみられる結晶方位の影響

概要

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In order to clarify the effect of grain orientation on cavitation erosion, vibratory tests were carried out on cast and forged austenitic-ferritic duplex stainless steel. The duplex stainless steel was eroded locally at a faster rate than the ordinary austenitic, ferritic and martensitic stainless steels. The localized erosion is due to the grain orientation which affects the erosion resistance for individual grain. The shortest incubation period and the highest erosion rate in steady-state period are obtained in grains of {100} orientation, and the lowest erosion rate is in those of {110} orientation. Microcracks grow parallel to the original surface for the former and grow vertically or at an angle for the latter. From the mechanical viewpoint, the material removal occurs more easily for the former. It was concluded the effect of grain orientation on cavitation erosion can be explained in terms of the slip plane and the related crack growth.
一般社団法人日本機械学会の論文
1998-03-25