烧结钢的形变热处理

本文对烧结钢的形变热处理作了简要评述。高温形变淬火是形变热处理的一种,它在烧结钢和粉末锻钢的生产中得到了应用。高温形变淬火显著改善烧结钢和粉末锻钢的延性和断裂韧性。文章探讨了烧结钢高温形变淬火的强韧化机理。高温形变淬火可以保留高温淬火组织上的优点,即得到位错型板条马氏体和薄壳状残余奥氏体,消除了孪晶型针状马氏体。

Thermomechanical Treatment of Sintered Steel

This paper gives a short review on the thermomechanical treatment (TMT) of sintered steel. High temperature thermomechanical treatment (HTMT) is a kind of TMT. It has been applied in the production of sintered steel and powder forging steel. HTMT significantly improves the ductility and fracture toughness of sintered steel and powder forging steel. Strengthening and toughening mechanism of HTMT of sintered steel was discussed. It was shown that the superiority of high temperature quenching is preserved after HTMT, i.e. to obtain dislocated lath marten site and thin retained austenite and to remove twinned acicular martensite.