LAMELLAR PRECIPITATION IN HIGH-NITROGEN H K-50 ALLOY

The precipitation kinetics and structural characteristics of lamellar precipitates in high nitrogen alloy HK 50 precipitated during isotherm al transformation of austenite were studied. The obtained results have shown that starting temperature of lamellar precipitation was 950-deg rees-C and precipitation process ended at 1000-degrees-C. It was prove d that lamellar carbides have not been observed in ageing process. The average growth rate of lamellar cells and lattice parameter of untran sformed austenite have shown descending course with advancing precipit ation of lamellar carbides. During lamellar carbide precipitation the metallic elements have shown short range diffusion and carbon exhibite d long range diffusion. There have not been observed the evident nitro gen distribution changes in alloy matrix.