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The effects of some factors on the creep behavior of 7)pe 304 stainless steel have been studied and the relations between the strength and the structure of the steel have been discussed. The main results obtained are as follows. (1) The creep and creep rupture strengths at 550°, 600° and 650°C increased with the increase in cold working rate up to 20% , but the creep rupture elongation decreased. These facts could be explained by the strengthening of matrix by dislocations which acted as precipitation sites of carbides during creep. (2) The steel was aged for up to 3000 hr at 550° to 700°C. Carbides precipitated on the grain boundaries and in the neighborhood of the grain boundaries. With long-time or high-temperature aging, the creep strength and creep rupture strength decreased, but the creep reupture elongation increased. (3) The creep strength at 600°C was independent of the grain size. Crack initiation was accelerated by the growth of grains, and therefore the creep rupture strength and elongatioll were decreased. (4) The creep strength of 7)'pe 304 stainless steel was increased by uniformly distributed fine carbides (Cr, Fe),3C6 which precipitated on dislocations during creep .

The Effects of Some Factors on the Creep Behavior of Type 304 Stainless Steel