The influence of structure on the results of nitriding of ledeburitic chromium steels

摘要

The paper presents the seventh part of the results of investigation carried out within project no. 1012/T08C/96/11 financed by KBN[8] including evaluation of the influence of surface metal forming on the results of ion nitriding of NCHLV (D2) steel with austenitic matrix after hardening from high temperature (1150 °C). Specimens were burnished by means of a diamond with a force of 150 N and 400 N and then ni-trided at the temperature of 400, 440 and 480 °C for four hours. The investigation has shown that deformation accelerates the diffusion of nitrogen during nitriding at the lower temperature of 400 and 440 °C; nitriding at 480 °C destroys the burnishing effect. The investigation has also shown that the structure influences the results of burnishing NCI 1LV steel. The influence of burnishing on the material characteristics of austenitic matrix steel is larger than its influence on the characteristics of steel with martensitic structure.