| 摘要 |
PURPOSE:To improve ductility of a two-phase stainless steel and to provide stably an optional shape by heating, cooling and reheating the two-phase stainless steel consisting essentially of Fe, Cr and Ni under specific conditions and deforming the stainless steel. CONSTITUTION:A two-phase stainless steel exhibiting two phases of a ferrite phase and an austenite phase at about ordinary temp. and consisting essentially of Fe, Cr and Ni is heated to the temp. region of (temp. at which the single phase of ferrite is formed -200 deg.C or above) and thereafter the steel is quickly cooled to <=500 deg.C by water cooling or force cooling to precipitate finely austenite in the ferrite which is matrix. The steel is then reheated to a temp. region of 700 deg.C-(temp. at which the single phase of ferrite is formed -200 deg.C) and is deformed at a straining rate of 1X10<-4>/sec-1X10<-1>/sec, then an intricate shape is provided simply and easily by plastic work alone. |
