SUS304 ステンレス鋼の冷間据込み加工における加工誘起変態

概要

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Temperature dependence of deformation-induced martensitic transformation in type 304 stainless steel is investigated by homogeneous compressive test which is carried out over large strain in the temperature range from 20 to 100℃. The results obtained for the volume fraction of martensite vs. plastic strain relationship at each temperature are formularized as a simple expression in order to develop a numerical simulation of martensitic transformation progress during cold upsetting. Distribution of martensite in specimens upset on hydraulic press or mechanical press is investigated by a coupled usage of magnetic measurement and X-ray diffraction. While the distribution profile of martensite volume fraction is rather clear in the specimens upset on hydraulic press because of inhomogeneous deformation, that found in specimens upset on mechanical press is somewhat vague due to temperature rise. Amount of deformation-induced martensitic transformation during cold upsetting is calculated by a simulation on the basis of strain and temperature distribution obtained by a coupled analysis of Finite Element Method (FEM) and Finite Difference Method (FDM). As for upsetting on hydraulic press the calculated result is smaller than the experimental result under the general complex deformation condition, however the distribution pattern looks common to both.
社団法人日本鉄鋼協会の論文
1990-03-01