Abstract
Adding copper up to 2.5% to low nickel stainless steel whose base composition is 17Cr-5.5Ni-5Mn, there was made a tensile test at temperature of -100°C to +80°C.Also, an investigation was made about the influence of copper on the stability of austenite. The tensile strength becomes smaller as copper content and testing temperature increase. However, the elongation reaches a peak at a certain temperature and this peak temperature becomes low as copper content increase. It was +50°C when no copper was added, but it was -30°C in the 2.5% copper bearing steel. The lowering effect of copper in this peak temperature is bigger than that of nickel.Relation between martensite content fα and true strain ε, there is recognized such a relation as fα=m.εk, m, k being constants. The constant m becomes bigger as temperature decreases, but k is maximum at the peak temperature. Comparing the decreasing effect in stacking fault probability of copper with that of nickel, we obtained modified formula of Angel's Md30, M*d30=Md30 -28.7 (% Cu), considering the term of copper.
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