| 摘要 |
<p>The present invention is a plastic working method for austenite-containing steel material wherein: a site at which fracture during plastic deformation of the steel material is predicted is specified; the strain ratio βx of said predicted fracture site is analyzed; the steel material is heated so that the local temperature Tlocal satisfies Formula (1); and the post-heating steel material is plastically deformed. Tβx is the maximum strain induced transformation ductility temperature with respect to the strain ratio βx in °C units, σLβx is the standard deviation of the strain ratio βx-dependent equivalent critical strain approximation curve that is on the low temperature side of Tβx, σHβx is the standard deviation of the strain ratio βx-dependent equivalent critical strain approximation curve that is on the high temperature side of Tβx, and Tlocal is the local temperature at the predicted fracture site in °C units. Tβx-2×σLβx ≤ Tlocal ≤ Tβx+1.25×σHβx (Formula 1).</p> |
