At present, domestic and foreign surfacing materials with excellent performance are mainly obtained by adding multi-element alloys such as ferrovanadium, tungsten, ferromolybdenum, and ferrochrome. However, due to the high alloy price, it is not conducive to reducing the production cost of surfacing; when a simple high-carbon Fe-Cr cast iron alloy system, although high hardness high chromium cast iron surfacing composite wear-resistant plates can be obtained, but because of its higher carbon content, its crack resistance deteriorates. Therefore, the development of a new high-chromium cast iron surfacing composite wear-resistant plate with high hardness, good crack resistance, excellent wear resistance and low cost has important engineering application value. This article is based on the principle of reducing the cost of high chromium cast iron surfacing composite wear-resistant plates and using simple alloys, adopting electrode arc surfacing method, and intends to develop a new type by introducing trace rare earth elements and adding two main alloys: ferrochrome and ferroboron Fe-Cr-B wear-resistant surfacing alloy with high hardness and high crack resistance. First of all, through the orthogonal test method, the mineral composition of the surfacing electrode coating was optimized, and the effects of different mineral compositions on the slag removal and coverage of the surfacing electrode and the crack resistance of the surfacing alloy were experimentally studied. A medicated skin formula with excellent performance.
Shandong Qishuai Wear-resistant Equipment Co., Ltd. uses Rockwell hardness tester, micro-hardness tester, optical microscope, scanning electron microscope, EDS energy spectrometer, direct reading spectrometer, X-ray diffractometer, etc. to surfacing composite wear-resistant plates of high chromium cast iron Tested and analyzed
. Studies have shown that graphite has little effect on the hardness of the surfacing layer, but deteriorates its crack resistance; adding an appropriate amount of rare earth magnesium can change the surfacing structure from columnar and dendritic crystals to uniformly distributed equiaxed crystals, and refine the structure of the surfacing layer. , Improve crack resistance. With the increase of boron content, the hardness and wear resistance of the surfacing alloy first increase and then decrease. The matrix structure of the high chromium cast iron surfacing composite wear-resistant plate is mainly martensite and retained austenite, and the hard phase is mainly composed of Fe-Cr phase with higher microhardness, M23(C,B)6, B0.7Fe3C0 .3. Fe3C and M7C3 are of equal composition, among which boride such as M23(C,B)6 is chrysanthemum-shaped or fish-bone-shaped, and it grows equally with Fe-Cr. The wear mechanism of the surfacing alloy was discussed by using the MM-200 wear tester and scanning electron microscope. The chrysanthemum-shaped boride has a good hindering effect on the intrusion of hard particles and the micro-cutting movement during the wear process. . In the later stage of wear, after the boride breaks under the impact load of abrasive particles, the underlying material will enter the wear stage.
The developed chromium carbide composite wear plate has a hardness of 58-62HRC and no cracks. It has high crack resistance and wear resistance. It can be applied to high-stress abrasive wear occasions and can be widely used in mines, cement, Coal mining machinery and other industries.
Helen Dong
helen@zbqishuai.cn
WhatsApp/WeChat：0086 13869392161