توليد فولاد زنگ نزن آستنيتي AISI 301 فوق ريز دانه/نانو توسط عمليات ترموديناميكي پيشرفته

Achieve nano/ Ultrafine Structure in Austenitic Stainless Steel AISI 301 with Advanced Thermomechanical Process

In this work necessary condition to achieve nano/ultrafine structure in austenitic stainless steel AISI 301 were investigated. In order to breakdown as-cast structure and decrease initial grain size, homogenization treatment at 1200 °C for 3 to 13 h and subsequent hot rolling were used. To obtain a nano structure, thermomechanical process consisting of 90 pet cold rolling and subsequent annealing at 600 C for varying times, were used. The results showed that the suitable homogenization time for as-cast 301 steel was about 9h. Also nano grains 150-300 nm was achieved when annealing took place at 600 °C for 5min and with increasing annealing time to 20 min, no noticeable grain growth took place because of formation carbide precipitation and prevents grain growth.