Effect of structure and phase composition on wear resistance of economical alloyed metastable and secondary hardening steels of Cr-Mn-Ti system

Abstract

Problem. Despite a large number of studies in the field of assessing the causes of hot and cold cracks in the surfacing of wear-resistant surfacing alloys, today the issues of developing relatively inexpensive alloyed wear-resistant surfacing materials and the technology of their application remain relevant. Purpose. The purpose of this work is to study the effect of structure and phase composition on the wear resistance of economically alloyed metastable austenitic and secondary-hardening steels of the Cr-Mn-Ti system, additionally alloyed with Mo, B, V. Methodology. Metastable austenitic, martensitic-austenitic and secondary-hardening steels of the Cr-Mn-Ti system additionally alloyed with Mo, V were investigated. Mechanized surfacing was carried out with alloyed flux-cored wires under fluxes AN-22 and AN-20 with the supply of a de-energized filler flux-cored wire to the head of the welding pool. The use of surfacing with a de-energized flux-cored wire made it possible to reduce the proportion of the base metal in the deposited metal, to reduce the specific consumption of electricity and flux, and to increase the assimilation of alloying elements in the deposited metal. Manual arc surfacing was performed with a CaF2-coated flux-cored wire electrode and a de-energized flux-cored wire in a copper die. Automatic submerged arc surfacing was carried out in the following modes: IN = 300 ... 350 A, UD = 26 ... 30 V, q = 6 ... 10 kJ / cm, with manual surfacing: IN =180 ... 220 A, UD = 25 ... 28 V. Results. The studies carried out confirm the possibility of the formation of a "white band" both in alloys with a high concentration of elements - austenizers (Mn, C, Ni), and when alloying with carbide-forming elements with a relatively low affinity for carbon. (V, Mo). The indicators of resistance to cracking (КС, j-integral, δС), and, consequently, resistance to wear, of secondary hardening martensitic steels are higher than of metastable and tool steels.