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Behaviour mechanism of carbide in quenching and tempering process of Nb-bearing martensitic stainless steel

ABSTRACT 30Cr13Nb0.1 martensitic stainless steel was quenched and tempered at different temperatures. The influence of heat treatment on microstructure and carbides evolution, mechanical properties and corrosion resistance was analysed by means of optical microscope (OM), scanning electron microscope (SEM) and optical hardness tester. The results showed that the content of carbides increased, the hardness values first raised and then declined slowly with increasing quenching temperature; the amount of carbides and impact ductility rises up, the hardness values and tensile strength declined with increasing tempering temperature. The microstructure of the tested steels tempered at different temperatures was characterised systematically and the change of test steel properties was closely related to the number, distribution and morphology of carbides, and finally affected the corrosion resistance of test steel. Eventually, 1050°C quenching and 300°C tempering could make 30Cr13Nb0.1 having good comprehensive performance.