Effect of carbon and phosphorous on the solidification microstructure in aCr-Ni-Mn-N austenitic hydrogen-resistant steel

The influence of carbon and phosphorus on the solidification microstructure of a Cr-Ni-Mn-N austenitic steel was studied. The button specimens were pr epared by vacuum induction melting and magnetic convection. The experimenta l results show that the increase of C or P concentration in the steel can c hange the solidification modes of Cr-Ni-Mn-N austenitic steels and has a si gnificant effect on the morphology of the dendrites. The content of delta - ferrite in the microstructure reduces with increasing the concentration of C or P in the steel, there is a gradient of the content of delta -ferrite f ormed from surface through the center of the specimens.