Retained Austenite and Its Effect on Properties of a Commercially Produced Dual Phase Steel

抄録

Commercial heats of Cr and Cr-Mo bearing dual phase steels have been hot rolled by keeping roll finish temperature in the range of 850-880°C and varying the coiling temperature between 200 and 570°C. Mechanical test and retained austenite measurement have been carried out on samples collected from different locations of coils (representing different cooling rates between M_s and M_f temperatures) and also on some of the as received samples which have been given selective heat treatment. The reason for wide range of retained austenite (varying between 0-16%) has been given based on the stability criteria of austenite. Effect of retained austenite on mechanical properties has been discussed and a distinct beneficial effect of retained austenite on mechanical properties, particularly elongation has been found.