フェライト系析出硬化型ステンレス鋼の時効挙動

概要

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To develope a precipitation hardening ferritic stainless steel, the effect of Mo, Si and Ni on the aging behavior of Fe-14% Cr base alloys has been studied. The results obtained are as follows:(1) The additions of Si and Ni to the Fe-14% Cr-(4∼6)% Mo alloys have a marked effect on the aging characteristics despite that the hardness increments of the base alloys are low.(2) The hardness after solution treatment is about 20∼30 of Rockwell C scale, while the aging hardness is reached to 40∼55. The hardness increment is larger than the commercial PH stainless steels.(3) Aging temperature of peak hardness is about 550∼600°C and is higher than that of martensitic PH stainless steels.(4) The higher the cooling rate of the solution heat treatment, the more rapid the attainment of maximum hardness and the higher the hardness value.(5) The X-ray data indicate that the compound precipitated is R phase which is previously observed in Fe-Mo system. The chemical analysis of electrolytic exracted residue shows that the R phase contains a large amount of Mo.