Optimization Design Of Cr-B-W-V System Of Multielement Composite Strengthening High Temperature-Wear-Resistant Iron Base Surfacing Welding Alloy

At present, materials used in high temperature-wear-resistance in the world are mostly Fe-Cr-C, Fe-Cr-B, and high chromium cast iron alloys, or cobalt base Stellite and some kinds of nickel base surfacing welding alloys, which are too expensive to apply widely though they have some outstanding merits in the aspects of corrosion stability, wear-resistance, and thermal stability and so on. To solve the problem above, in this paper, we have successfully developed one kind of Cr-B-W-V system multielement composite strengthening high temperature-wear-resistant iron base surfacing alloy, combining the method of orthogonal regression design with experiments.In accordance with corresponding informations, and in view of the characteristics of high temperature-wear-resistance, the initial prescription of Cr-B-W-V system multielement composite strengthening high temperature-wear-resistant iron base surfacing alloy powder is determined. Then, use welding material computer assistant design system - WMCAD programmed by myself, adopt linear orthogonal regression design to plan experiment, the wear weight loss W(760 ) of the surfacing welding layers formed by the alloy powders that we studied as test check target, do optimization design on the prescription of Cr-B-W-V system of multielement composite strengthening high temperature-wear-resistant iron base surfacing welding alloy, establish the regression equation of high temperature-wear weight loss and mass percentage of elements of the alloy we studied, form the corresponding mixed penalty function and then find the extreme value of it, obtain the optimization prescription at last.This paper also verified the result of the optimization design with experiments. It is as follows: According to the design prescription, mix all kinds of ferroalloy powder evenly, and spread them on test specimens whose substrate is Q235, with adhesive made of soluble glass passivated by potassium permanganate, and then surface the drying specimens with plasma arc (experiment plan as 4.1.2 & 4.2.2). On the basis of analysing in depth the distribution of the constitution and hard phase of the corresponding surfacing welding layer, we systematically investigated effect law of elements of Cr, B, W, and V etc on normal temperature hardness, hightemperature hardness, normal temperature wearability and high temperature wearability of the corresponding surfacing welding layer (as 4.1.3 & 4.2.3) and high temperature-wear-resistant mechanism of it, so it can be test if the result of the optimization design is consistent with the experiment result.Investigation results proved that: The high temperature property targets of the sufacing welding layer formed by the alloy powder we developed, such as hardness HV (760 ) and wear weight loss W (760 ) , are all superior to those of cobalt base Stellite NO. 12, that is, high temperature wearability of the layer is superior to that of cobalt base Stellite NO. 12.