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Two Novel Wear-resistant Surface Welding Materials and the Structure Property of Deposited Metal

Author: ZhangGuoQiang
Tutor: SunJunSheng
School: Shandong University
Course: Materials Processing Engineering
Keywords: Sandwich alloy powder block Scrap Alloy particles Surfacing Organizational performance
CLC: TG42
Type: Master's thesis
Year: 2008
Downloads: 479
Quote: 2
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Abstract


Most of the mechanical parts is manufactured using a metal material, wear will occur due to a relative movement between the parts or between parts and materials. With the development of modern industry, the mechanical parts is often exceptionally complex and demanding work conditions, a large number of machinery and equipment are often scrapped due to wear. The Surfacing due process is simple, less investment in equipment, flexible operation, wide adaptation and is widely used in the preparation of the steel surface wear-resistant alloy layer, to improve the life of the mechanical parts. Electrodes, flux cored wire surfacing materials are traditional, commonly used in the production of alloy powder. Alloy powder production process is complex, making the cost of surfacing materials increased significantly. At the same time lower production efficiency of traditional manual welding process. Address the problem, design a sandwich alloy powder blocks, two new surfacing alloy particles hardfacing material. Sandwich alloy powder blocks to solve the problem of low efficiency of manual welding, the surfacing alloy particles while production of iron and steel enterprises steel scrap as the main raw material, reduce production costs. Sandwich alloy powder block is composed of two parts of the core wire of the internal and external drug skin, whose cross section is designed as one of the specific geometry of the triangular, semicircular, trapezoidal, etc., a good solution to the block of alloy powder, the alloying elements than more higher melting difficult welded problem. Hydraulic electrode pressure coater repression, H08A core wire add alloy powder block, to ensure that the pressure of the coating process performance. Sandwich alloy powder block arc deposited. According loaders wear conditions, design Cr-Mo-V-based sandwich alloy powder block, Cr-Mo-V alloy powder block surfacing metal by means of SEM, X-ray diffraction and electron probe experiments organization and performance. Experimental results show that: the organization of the Cr-Mo-V-surfacing metal mainly to martensite and alloy elements such as Cr, Mo, exists mainly in the form of a solid solution in the matrix. Experimental Study of the Cr-Mo-V hardfacing metal Cr / C ratio of Mo content, hardness and wear resistance of surfacing metal by abrasive wear. Based on the findings, the Cr-Mo-V the Sandwich alloy powder blocks used in the loader working device engineering test results show good abrasion resistance. Raise the level of the iron and steel metallurgy industry equipment, high purity steel production has increased every year. In the steel production process, the needs of the cut to length steel production generates approximately 4% to 5% of the head of the board, the board edge, steel enterprises re steelmaking as scrap melted down, making re-take these scrap steel making, steel rolling process waste energy and pollute the environment. Cleansing characteristics of these scrap has found welding material standard raw materials used, and which contains alloying elements can also be effective use for the welding metallurgy. In this paper, the production of iron and steel enterprises scrap as raw material, intermediate frequency induction furnace scrap is melted into molten steel, add the appropriate amount of alloying elements and the surfacing material use conditions, made the molten steel surfacing alloy particles using centrifugal atomization technology alloy particles having a diameter of 0.1 to 5mm, spherical or spheroidal. Alloy particles arc welded to a steel surface obtained with wear-resistant alloy layer clad steel plate. This article has designed a series of Fe-Cr-C system high chromium cast iron hardfacing alloy particles studied by means of SEM, X-ray diffraction experiments hypoeutectic, eutectic and total grain Fe-Cr-C alloy particles Heap the microstructure and properties of the weld metal. Experimental study of the wear resistance of the Fe-Cr-C alloy particles deposited metals by abrasive wear, the carbon equivalent of the deposited metals, hardness and wear resistance, as well as over-carbonation in hypereutectic high chromium cast iron hardfacing metal the relationship between the physical quantity and the abrasion resistance of. Fe-Cr-C alloy particles surfacing resistant composite steel production loader bucket wear parts river sand, in of Shandong Dawenhe mining battlefield installed experiments. The results show that the wear resistance of bucket loaders river sand greatly improve.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding materials
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