Reverse austenite and its effect on the cryogenic tensile properties in the temperature range of 20 o C to -196 o C in 0Cr13Ni4Mo steel were investigated by electron microscopy, X-ray diffraction and tensile tests. Different amounts of reverse austenite were obtained by controlling tempering temperatures. It was revealed that good cryogenic ductility of the steel was obtained due to the existence of reverse austenite and its transformation to martensite during deformation. However, cryogenic ductilities were found to be related to the amounts of transformable reverse austenite during deformation rather than to the total amounts of all reverse austenite in the samples. The maximums of the ductility of the specimens containing reverse austenite were found at 0 o C or at -50 o C.
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