PRODUCTION OF HIGH-STRENGTH AUSTENITIC-FERRITIC STAINLESS STEEL

摘要

PURPOSE: To form the structure of high-strength austenitic-ferritic stainless steel into an ultrafine-grained one and to improve its mechanical properties without deteriorating its ductility. ;CONSTITUTION: This high-strength austenitic-ferritic stainless steel having an ultrafine-grained structure is produced so that the powder of austenitic-ferritic stainless steel with 40 to 100μm powder size of austenite-ferrite two phases or a ferrite single phase of supersaturated solid solution is subjected to intense working by a mechanical alloying method, then rapidly heated from a room temp. to a solidifying temp. of 1000 to 1020°C, succeedingly subjected to compacting by executing hot rolling at 40 to 70% draft or hot extrusion at 5 to 15 extrusion ratio, and immediately subjected to rapid cooling to a room temp. In this producing method, heating from a room temp. to a solidifying temp. of 1000 to 1020°C can be regulated to ≤15min at the latest.;COPYRIGHT: (C)1995,JPO