Strain-induced transformation and plastic deformation behaviour of a 17Cr-7Ni-1Al steel at high hydrostatic pressure |
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Authors: | Yoshinari Kaieda Atsushi Oguchi |
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Affiliation: | (1) Metal Processing Division, National Research Institute for Metals, 2-3-12 Nakameguro, Meguro-ku, 153 Tokyo, Japan |
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Abstract: | Tensile tests of a 17Cr-7Ni-1Al steel were carried out at 0.1, 300 and 600 MPa hydrostatic pressure, and the mechanical properties of the material were found to be considerably changed by the pressure. The martensitic transition temperatureM
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decreased under pressure. The volume fraction of-martensite induced by tensile deformation increased with strain, but was suppressed by hydrostatic pressure. The yield stress increased with pressure. The yield surface became a nonlinear cone with a pointed apex. The stress-strain curve was considerably changed by pressure, and was expressed by a modified identical-strain model (law of mixture) as a quantitative function. Uniform-strain limit increased with pressure. It was found that these changes were not caused by the mechanical effect of hydrostatic pressure, but by its thermodynamic effects. |
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