Surface treatment of powder plasma arc welding on a simple geometrical parent material can produce complex and wear-resistant mold elements with minimal subsequent processing required.
The newly developed powder plasma arc surface surfacing device is mainly used for surface hardening of mine bucket pre-cutting tools, and is subjected to surface hardfacing welding using different consumable materials and welding parameters. In addition to the WC3.9+40NiSi3B2 consumables (a powder containing tungsten carbide as a hardening material, the matrix is ​​similar to a brazing filler metal), various other alloys (also containing spheroidized carbides) are used. In this study, a wear test was performed in the laboratory using a Hardworth-ZIS machine. The wear resistance of several alloys is even better than that of powder metallurgy cemented carbides with WCo = 12%.
For the plasma arc surface surfacing of the hard metal alloy on the surface of the iron base material, the wear resistance of the coating can be improved by adding nitrogen to the working gas to obtain nitriding, forming a mixed crystal structure and making the crystal grains fine. Turn. In particular, the properties of the coating depend on the nitrogen content of the transition and plasma gases.
In addition, on the SUJ2 substrate (a wear-resistant bearing steel, the composition is: Wc = 0.95% ~ 1.10%, WSi = 0.15% ~ 0.35%, WMn > 50%, Wp = 0.025%, Ws = 0.025%, WCr =l.30%~1.6%, WMo>0.08%, WNi>0.25% and WCu>0.25%) Powder plasma arc surfacing is performed to produce a wear-resistant intermetallic nickel-titanium alloy structure. The wear resistance of the build-up layer structure was established by a modified apparatus of the Okoshi type. The study of the build-up layer structure is not only to determine the influence of the process conditions on the formation of intermetallic compounds (NiTi, TiFe and TiFe2), but also to evaluate whether the process is suitable for the manufacture of wear-resistant surface structures.
At the same time, extensive analysis and research on the causes, control techniques and influencing factors of deformation and residual stress generated by powder plasma arc surfacing are carried out. The developed finite element calculation model can be used to analyze and predetermine the composite materials. Deformation and residual stress caused by the welding of the parts. This part is subjected to asymmetrical high-dose surface surfacing on high-strength materials and is thus subjected to large stresses. The formation and various influencing factors of welding deformation and residual stress during the manufacture of such parts were studied by calculation and test methods.
Application examples show that parts with different characteristics can be manufactured cost-effectively by surface surfacing.
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