18Mn-5Cr 系非磁性鋼の高硬度化および透磁率に及ぼす合金元素および熱処理の影響

概要

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In order to obtain the basic information for developing high hardness non-magnetic steel, the effects of alloying elements and heat treatment on various hardening mechanisms and magnetic permiability were investigated in 18Mn-5Cr-2Ni-C steels. Large work hardening was not always found in steels which were presumed to have low stacking fault energy. This fact could be qualitatively explained by the relationship between the formation mechanism of deformation twin and pre-existing dislocation configuration, and by the effect of SFE on a breaking down of Interstitial-Substitutional complexes. Vanadium increased hardness effectively through precipitation of fine V_4C_3 carbide, whereas it reduced an amount of ε martensite produced by cold working. Silicon addition enhanced the precipitation of V_4C_3 and strain aging. The increase in hardness could be kept even after the reversed transformation of ε martensite. In high C steels, permeability was increased when M_3C carbide precipitated. Through suitable heat treatment, a steel with high hardness around HV 650 and very low permeability could be obtained.
社団法人日本鉄鋼協会の論文
1992-05-01