時効硬化型オーステナイト非磁性鋼の強化

概要

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The present study aims at reducing the reducing the grain boundary brittlement caused by the preferential precipitation of carbide on grain boundaries and at strengthening age-hardenable austenitic steels. An investigation was made on the effect of the thermo-mechanical-treatment on the properties of Mn-Cr and Mn-Ni-Cr type austenitic steels containing V by means of the mechanical test and the microscopic method. The results obtained are as follows : 1) Although the strengths of 0.4C-17-Mn-12Cr-2Ni-2V and 0.4C-13Mn-8Ni-5Cr-2V steels are raised remarkably by aging, these steels are susceptible to the preferential precipitation on grain boundaries, so that the values of the elongation and the reduction of area fall down drastically. From the observation of the fractured surface, it is found that the fracture generates along grain boundaries. 2) The preliminary cold working gives good effects upon the mechanical properties of the two steels after aging treatment ; it increases the strength and the ductility. 3) The preliminary working contributes to decreasing the grain boundary embrittlement that is developed when age-hardening occurs. 4) By the combination of the preliminary hot working process and the aging treatment, the two steels show the higher strength and ductility.
1973-02-01