EFFECT OF NITROGEN ON THE THERMAL DEFORMATION BEHAVIOR OF MARTENSITIC STAINLESS BEARING STEEL

The thermal deformation behaviors of martensitic stainless bearing steels (0.16N, 0N) in the temperature range 850–1150 °C, strain rate 0.01–10 s–1, and deformation of 60 % were studied using a single-pass compression experiment. After adding 0.16 % nitrogen, the peak stress of the martensitic stainless bearing steel increased under all thermal forming conditions, and the average peak stress increased by about 33.724 MPa. The strain-rate sensitivity diagram, power dissipation diagram, instability factor diagram, and thermal processing diagram under different strains were constructed based on the stress-strain curve. The thermal deformation activation energy under different strains was constructed and combined with a metallographic structure analysis. The results show that under the same conditions, the occurrence of DRX in 0.16N bearing steel is less than that of 0N bearing steel, but the grains are finer than those of 0N bearing steel.