Makoto Endoh1 and Jirou Namekata1
1Defense Academy, Mechanical Engineering Yokosuka
An investigation was made of the effect of carbon on properties of nonmagnetic 17% mangan, 12% chromium, 2% nickel, 15% Vanadium steels which contained 0.04 to 1.68% carbon. The properties of these alloys was also studied by means of the hardness test, mechanical test, magnetic measurement and microscopic methods. Some of the results of the investigation are as follows:
(1) The increase in hardness from the solution treated hardness to the maximum aged hardness was primarily governed by the amount of carbon in the solid solution prior to aging treatment. The maximum aged hardness might be obtained by aging in the austenitic steels with the carbon content saturated in the solid solution when a suitable solution and aging temperature are employed.
(2) The effect of the aging temperature on the age-hardning of 17% mangan, 12% chromium, 2% mickel nonmagnetic steels in Table 1 was inconsipicuous at 600°C but became remarkable at 750°C. The highest hardness after aging was obtained by the aging temperature of about 700°C.
(3) The yield strength in the aged condition increased with the carbon content in the γ solid solution. The nonmagnetic steel containing 0.63% carbon, 17% mangane, 12% chromium, 2% nickel, 1.5% vanadium showed a yield strength of 110 kg/mm2 and an elongation of 18% when aged after solution treatment.
(4) The values of permeability in the aged condition were in the vicinity of 1.003.
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