Research On Cr13Stainless Steel Hard-facing Flux-cored Wire And Performance Of The Deposited Metal

The part’s service life could be significantly improved by surfacing rebuildingtechnology and spraying wear coatings on the worn parts, thus the production cost couldalso be saved. Martensite stainless steel as a kind of hard-facing material with highhardness and good wear resistance has attracted more and more researchers’ attention, andit is widely used in the roll overlaying welding repair field.The subject is foundation on Cr13martensite stainless steel flux-core wire,developing a new hard-facing flux-cored wire contained Mo and Ni. Weight percentage ofthe powder compositions are: carbon ferrochrome60-70%, ferromanganese6-8%,ferrosilicon6-8%, molybdenum iron0-8%, nickel iron0-8%.Manufacturing five surfacing layers on low carbon steel Q235with appropriatewelding process parameters, and then we obtained clad layer metal which has goodforming quality. Through analysis of the phase、 microstructure、 hardness and abrasivewear properties, to research the influence of alloy element Mo and Ni for hardness andhigh temperature wear resistance. Experiments show that:(1) The main microstructure in welding state was martensite、residua austenite andcarbide. After heat treatment, the microstructure was mainly tempered martensite andcarbide precipitation increased. When the heat treatment temperature more than560℃,tempered martensite transformed into tempered sorbite, and carbide gathered to grow up.(2) The performance of clad layer metal was the best when Mo, Ni content was4%,2%. Mo element can be formed in carbide which strengthens precipitation; Ni is austeniticstable element, which can prevent peeling of carbide during the wear process, to improvethe high temperature wear resistance.(3) Proper heat treatment temperature can promote carbide precipitation, increase thedislocation density, and promote martensitic decomposition and austenite transformation. To increase hardness, reduce wear weightlessness, when the heat treatment temperaturewas560℃, hardness and high temperature wear resistance significantly reduced.