TY JOUR TI PROSPECTS FOR THE USE OF ELECTRIC SPARK ALLOYING ON THE WORKING SURFACES OF LOCOMOTIVE BOGIE PARTS KW electric spark alloying KW bogie KW diesel locomotive KW hardening KW wear-resistant coating KW restoration KW roughness KW surface KW microhardness KW alloy KW graphite JO Transport engineering AU Zhuldybin, A.A. AU Vladimirov, A.A. AU Shapovalov, A.I. PY 2025 IS 2025 PB Bryansk State Technical University