THE INFLUENCE OF STRAIN HARDENING TO THE STRUCTURE AND PROPERTIES OF FE-C-CR-MN STEELS

Abstract

The article deals with problems associated with strain-hardening of Fe-C-Cr-Mn-Ti-Si alloys with low carbon metastable austenite matrix containing 6…7 % (vol.) thermodynamically stable TiC carbide. Objective – research kinetics of strain hardening metastable surfacing alloys system Fe-C-Cr-Mn-Ti-Si. Comparing their workability and durability to the widely used surfacing alloys. Main results of the research: Surfacing chromium-manganese alloy steels with the structure of metastable austenite has high wear resistance to abrasive wear compared to the surfacing of tungsten steel. Durability is largely correlated with the microhardness of the surface layer. With decreasing contents of metastable austenite the hardening effect and durability reduced. For surfacing with martensitic structure a slight strain hardening is measured. This points to the leading role of strain hardening of austenite and phase transformations in wear resistant surfacing alloys. During tests on abrasive wear for chromium-manganese alloy steels wear intensity decreases, but for materials with different structure it is not typical.