高Crフェライト系耐熱鋼溶接金属におけるクリープ特性および靭性に及ぼすV, Nb, Tiの影響(相変態・材料組織)

概要

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The effects of V, Nb and Ti on the creep property and the toughness of weld metals for high Cr ferritic heat resisting steels were investigated. The following were clarified : (1) Increasing V from 0 mass% to 0.11 mass% improves the creep property and impairs the toughness. Increasing V by more than 0.11 mass% impairs the creep property and improves the toughness. (2) The creep property is improved and the toughness is impaired by adding a small amount of Ti. (3) Addition of Nb improves the creep property and impairs the toughness. However it improves the balance between the creep property and toughness more than the addition of V and Ti. (4) The changes of the properties due to V, Nb and Ti could be explained by changes in the morphology of MX. (5) The changes in morphology of MX could be explained by changes of driving force and grain growth kinetics.
社団法人日本鉄鋼協会の論文
2006-02-01