STUDY OF THE EFFECT OF STRUCTURE AND PHASE COMPOSITION ON THE WEAR RESISTANCE OF SPARINGLY ALLOYED METASTABLE AND SECONDARY HARDENING STEELS

Introduction. The paper considers the influence of wear on formation a “white band” in metastable austenitic, martensitic-austenitic and secondary hardening steels Cr−Mn−Ti system additionally alloyed with Mo, B, V. structure phase composition resistance sparing. Results. Surfacing studied materials was carried out copper molds different rates forced cooling. Metastable V were studied. Additional alloying these titanium an amount 2...5 % contributed to prevention spalling along fusion zone. Near line there is base metal zone width 7...15 µm. After testing at volume temperature working part specimen ТV = 553…573 K contact volumes deposited 30Kh2V8F type, broadening grain boundaries, shear lines, finer grains compared underlying layers revealed. Outside plastic deformation, size corresponds their sizes before start testing, boundaries are relatively thin. number location carbides observed X430, X80O magnifications also similar structural characteristics type. At close values pressure friction pair, time crack critical length increases increase effective surface energy γе (including deformation). Thus, indices (CR, j-integral, δС) and, consequently, maraging higher than those tool steels. Conclusions. conducted studies confirm possibility both alloys high concentration elements − austenitizers (Mn, C, Ni), when carbide-forming low affinity for carbon (V, Mo).