Temperature measurement and surface burn out in grinding 1Cr11Ni2W2MoV high-temperature stainless steel

The measuring method for the internal instant temperature and average temperature of grinding contact zone, as well as the correlation of the average temperature and burn extent in workpiece surface in the grinding process of high-temperature stainless steel (1Cr11Ni2W2MoV) were investigated, and the impact of the burn extent on the metallographic structure of workpiece surface was analyzed. In the process of grinding 1Cr11Ni2W2MoV using vitrified bond CBN grinding wheel, the internal instant temperature of grinding zone was obtained, the average temperature of grinding area proves to be direct influencing factor of the surface burn. Sufficient experiments under various grinding parameters prove that surface burn out only occurs when the average temperature exceeds 540°C, slight burn with yellow appearance occurs at 540°C and gets more severe as the temperature increases. Meanwhile, surface burn out makes martensitic lattice turned into tiny annealing microcrystalline texture, and the thickness of microcrystal increases as the burn phenomena becomes more severe.