Austenitic stainless steel forgings have no homogeneous amorphous transformation during the heating process, the heating temperature is too high, and the alpha phase in the duplex stainless steel increases. Experiments on 1cr18ni9ti Steel show that the number of alpha phase increases faster after the heating temperature exceeds 1200 ℃. Therefore, the initial forging temperature of austenitic stainless steel forgings should not exceed 1200 ℃.
In addition to the stabilization of austenitic stainless steels and the exceptionally low carbon content of austenitic stainless steel with the elements of titanium and niobium, other austenitic stainless steel forgings of the final forging temperature, should be Grosvenor Yu temperature (this temperature is about 815?480℃, this temperature insulation will have chromium carbide along the grain boundary of the final forging temperature of the two steels can not be too low , too low deformation resistance is large, and in the 700?900℃ interval cold will precipitate alpha phase, forging easy to crack, so the final forging temperature generally take 900 ℃.
Austenitic stainless steel forgings in case of carburizing, it will cause the formation of chromium carbide, so that the austenite grain boundary poor chromium and reduce its intergranular corrosion resistance, so this type of steel heating to avoid contact with carbon, also can not use reductive atmosphere, after forging should be fast cold through the sensitization temperature, lest precipitate excess phase and reduce corrosion. In order to raise the Grosvenor corrosion resistance, the carbide precipitated in the process of deformation and cooling is dissolved into austenite, and the solution should be treated.