MODEL REPRESENTATION OF THERMAL SHOCK IN SLIDING FRICTION LUBRICANTS AND ASSESSING ITS INFLUENCE ON STRUCTURAL PHASE TRANSITIONS IN THE SURFACE LAYERS OF STEEL
The article presents the model representations of thermal shock in the continuum approximation (solid medium) and at the level of the crystal lattice occurs when sliding steel with lubricant. It is shown that thermal shock leads to a high pressure, propagating in the surface layers of steels in the form of waves of expansion - contraction. Determined that these waves cause a diffusionless (polymorphic) conversion, and an abnormally high rate of diffusion mass transfer at temperatures below the phase diagram of the kinetic reactions “temperature – percentage”. Determined by the calculated values, a pressure and diffusion coefficients.