ELECTROLYTE-PLASMA SURFACE TREATMENT OF 42XMFA (SIMILAR MATERIAL AISI 4140) STRUCTURAL-ALLOY STEEL, USED FOR THE MANUFACTURE OF CRANKSHAFTS OF KAMAZ-740 ENGINES.

Abstract

Increased requirements for fatigue strength and wear resistance of the crankshaft require the development of technological processes for the repair and restoration of transport engineering. The surface hardening of the high loaded crankpin and main bearing journals of the crankshaft after grinding to the repair size is the most relevant. The technology of electrolytic-plasma processing for the KAMAZ-740 crankshaft samples during major repairs has been developed. There is a small acicular martensite and isolated areas of residual austenite on the surface microstructure of the sample. The measurement results indicate that the values of the surface microhardness of the part increased after the electrolytic plasma treatment. The local electrolyte-plasma treatment provides the required hardness and high wear resistance of the crankpin and the main bearing journals of the crankshaft, which significantly increases the service life.