Study On The Property Of Wear Resistant Low Transformation Temperature Electrodes

With the development of the modern industry and the science & technology, the machine parts are often in extremely complex and harsh working conditions. Because of wear, the corrosion, the abrasion discard the massive mechanical devices cause huge economic losses.In order to solve the above problem, on the base of low transformation temperature electrodes which were made in Welding institute in Tianjin University, we put in other alloying elements , suitably adjusted the contents of carbon, chromium, nickel, manganese which influence the temperature of martensite transformation, thus obtained one kind of high hardness wear resistant low transformation temperature electrodes.We carried on the microstructure to the deposited metal of the electrodes to observe, mechanics performance test, the welded joint residual stress survey and the wear test research, the analysis results are as follow:The crack of deposited metal did not occur even under conditions of non-preheating and non-postheating. By adopting optical microscope and SEM the microstructure of deposited metal was martensite,retained austenite with carbides which are dispersively distributed in the matrix. Its plasticity is not high, but its hardness was not less than HRC54,which could be used to welding axis and rollers。Both the deposited metal and the zone around the welding seam obtained the compressive residual stress, which has effectively adjusted the distribution of weld joint residual stress. It improves the mechanical properties and wear resistant properties of the deposited metal.By doing some dry friction experiments on the wear resistant low transformation temperature electrodes and the base-materials 45 steel, we found that the deposited metal has a high wear resistance, and its relative wearability is 33 times better than that of 45 steel.