日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 1 (1976),
pp. 85-88

Effect of Hydrostatic Pressure on the Ductility of an Alloy Steel

Minoru Nobuki1 and Atsushi Oguchi1

1National Research Institute for Metals, Tokyo

Abstract:

A heat treated alloy steel (0.39%C, 0.77%Mn, 1.81%Ni, 0.78%Cr, 0.23%Mo) was tested in tension at atmospheric pressure under 12000 kg/cm2 at room temperature in order to investigate the behavior of the increase in ductility under hydrostatic pressure and the possibility of the increase in tensile strength of the material prestrained under pressure. The results obtained are as follows: (1) The density of cracks generated due to plastic deformation is observed to be the same order of magnitude both by the prestrainings at atmospheric pressure and under 12000 kg/cm2 at small strains. However, with increasing amount of prestraining, the crack density becomes larger at atmospheric pressure. Moreover, when the material is deformed under high hydrostatic pressure, it can be deformed further even to the strains where the crack density is larger than that observed just before fracture at atmospheric pressure. (2) When the quenched material is tempered at various temperatures and prestrained under 12000 kg/cm2, or vice versa, the tensile strength is observed to be higher with lower tempering temperature and larger prestrain. In these cases, it can be thought that the former is more advantageous than the latter because of larger residual strain to fracture.


(Received 1975/05/27)

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