凝固過程および凝固後のステンレス鋼の引張強度の発現挙動

概要

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Phase dependence of tensile strength of stainless steel samples during and after solidification has been investigated by a high temperature tensile test. The experimental technique enables the sample to melt and solidify without a crucible, and to measure a minute load in a solidification temperature range. The tensile strength of samples is depended on phase but not content of chromium and nickel. Empirical equations of the tensile strength of δ phase and γ phase are established from experimental results. σ_δ=0.013(T_S-T)+1.7, MPa σ_γ=0.061(T_S-T)+8.0, MPa where T_S is solidus temperature and T is temperature. The tensile strength of δ phase sample is smaller than that of γ phase, and temperature dependence of tensile strength of δ phase is smaller than that of γ phase. The tensile strength of two phase (δ+γ) is estimated from next equation. σ_<(δ+γ)>=σ_δ・f_δ+σ_γ・f_γ, MPa where, f_δ and f_γ are the fractions of δ phase and γ phase, respectively. 18mass%≦Cr≦25mass%, 4mass%≦Ni≦25mass%, 1473K≦T≦1850K This estimated value is in good agreement with measured value.
社団法人日本鉄鋼協会の論文
1998-06-01