Influence of chemical compositions on martensite transformation of spring steels.
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概要
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The spring steels have comparatively higher hardenability, therefore hardening cracks tend to occur. From the viewpoint to prevent hardening cracks, the martensite transformation behavior of four spring steels were investigated by two-step quenching method using Formastor-F.The results obtained are follows.1) The martensite transformation starts just below the Ms point every type spring steels.2) The temperature difference from the Ms point to the 90% martensite transformed temperature of SUP9 is smoller than that of other spring steels (that is, SUP11A, SUP10 and SUP12). So that, when SUP9 is quenched, the martensite transformation rapidly proceeds other spring steels.
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