Tempered low-carbon titanium steels

Abstract

Four vacuum-melted titanium steels, Fe—0·14C−1·4Mn−0·04Ti; Fe−0·12C−1·27Mn−0·34Ti; Fe−0·10C–0·01Mn−0·57Ti; and Fe−0·11C−1·26Mn−0·53Ti were solution treated at 1300°C and tempered in the range 500°−700°C for times between 0·1 and 100 h. Isothermal tempering-hardness curves all gave secondary peaks, the highest being 470 HV(300g) after 3·5h at 550°C for the Fe−0·11C−1·26Mn−0·53Ti steel. The steels with the high titanium additions had structures containing insoluble particles >1 μm dia., which behaved as nucleating sites for recrystallization. The presence of the insoluble titanium particles was associated with preferential softening. Additions of 1%M n to the base steel moved the secondary hardness peak to shorter tempering times, and possible explanations for this observation are presented.

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