INCREASING WEAR RESISTANCE OF NICK-EL-FREE STEELS, ALLOYED BY TITANIUM AND MOLYBDENUM
Journal Title: Вестник Харьковского национального автомобильно-дорожного университета - Year 2018, Vol 82, Issue
Abstract
In the field of work related to wear-resistant surfacing, numerous studies have been carried out, highly effective methods of manual and mechanized surfacing, and high-quality surfacing materials have been developed. The service characteristics of the weld metal intended for work in different wear conditions are determined, first of all, by the doping system and, as a consequence, by different phase composition and structure. In this case, the least favorable phase component is ferrite, since it has a low level of hardness, wear resistance, viscosity and resistance to fracture. Alloying with bainite, martensitic-austenitic and martensitic matrices, including martensite aging, was widely used for restoring surfacing. However, significant content of scarce expensive elements (nickel, copper, cobalt, molybdenum, tungsten) in martensite-aging alloys limits their application. Now there was a need for the development of resource-saving alloys. The methodology of the study included the development of surfacing powders, automatic surfacing with further study of the structure and phase composition of samples of the weld metal. As a result of the study, it was found that when multi-layer surfacing, the previous rollers are heated above the point of the AS1. In the process of cooling the sections heated above the point of the AS1, the strength in the range of the least stable austenite depends on the running energy of the surfacing and the temperature of the previous layers. The following thermal insulation will contribute to the isothermal decomposition of austenite and the release of martensite, if it was in the structure of the metal. The formation of sorbitol from the above is facilitated by: relatively slow cooling associated with the change in the volume of the weld bath, the local increase in the temperature of the start of martensitic transformation (the formation of carbides and the reduction of carbon in the solid solution), the presence of chromium and a significant amount of manganese. In this case, the presence of titanium in the amount of 1,6–2,0% with a carbon content of 0,4–0,5% allows to obtain a carbon-free matrix with a carbide hardening phase. The hardness of the deposited metal in comparison with the martensite-trousite structure decreases by 4 – 6 HRCе.
Authors and Affiliations
V. Bagrov
Keywords
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- EP ID EP480007
- DOI 10.30977/BUL.2219-5548.2018.82.0.98
- Views 107
- Downloads 0
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