Deformation-, temperature- and time-induced phase-transformation of two high alloyed tool steels

By means of quenching and deformation dilatometry phase transformation of the steels X 30 WCrV 5 3 and X 30 WCrV 9 3 were measured. Concerning the shear transformation from austenite into martensite there is a dependency on heating rates and on austenization temperature. Higher tungsten contents make the austenite relatively unstable and leads to effects similar to the ones at reduced austenization temperatures. Deformation processes lower the transition points, whereby this decrease is directly proportional to the deformation degree. Carbide precipitation before or after deformation leads to linear increase of transition points, which changes to an exponential increase with a starting pearlite formation. (IFAM