クロム, ニオブを含むマレージング鋼の研究(鉄鋼材料の組織・性質)

概要

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Fe-Ni-Cr maraging type steels with two different kinds of matrices were studied on their micro-sub-structures and aging behaviors. 1) A kind of dissimilarity was observed in the micro-substructures of martensites annealed at different levels of temperatures. 2) Increase of the annealing temperatures generally resulted in a retardation of the aging process and in higher peak hardness values which appeared to be associated with niobium. 3) Steels with higher chromium matrix had a tendency of retarding the aging process, which was observed in many features. Particularly when directly quenched to a subzero temperature, they showed peculiar subcell structures and some higher strength values. 4) In the case of higher nickel matrix the reverted austenite precipitated in a continuous manner by forming Widmanstatten figure, whereas in the higher chromium matrix rather massive austenite appeared preferentially nucleating on the sub-boundaries regardless of other precipitating substances.
1968-03-01