High-chromium cast iron composite inoculant, preparation method and application thereof

Abstract

The invention relates to a high-chromium cast iron composite inoculant, a preparation method and an application thereof, in particular to cast iron alloy containing chromium. The high-chromium cast iron composite inoculant is a nanocrystalline high-chromium cast iron composite inoculant containing rare-earth ferrosilicon and ferroboron. The high-chromium cast iron composite inoculant comprises Fe-Ce-Si-Ca intermediate alloy and Fe-B intermediate alloy, wherein the weight ratio between the Fe-Ce-Si-Ca intermediate alloy and the Fe-B intermediate alloy is 1:0.07-0.13. The nanocrystalline crystal grains of the inoculant are less than 100nm, the inoculant is a flaky inoculant obtained by carrying out melt fast-quenching processing on raw materials which comprise commercially purchased rare-earth ferrosilicon and commercially purchased ferroboron, the inoculant is used for carrying out crystal grain and tissue refining processing on the tissue of the high-chromium cast iron alloy of high-chromium cast iron wear parts used for engineering machinery, the processing method is a metal melt casting method, the casting defect of the existing casting technology of the high-chromium cast iron alloy is overcame, and matrix crystal grains and cementite phases are obviously refined, so that the overall mechanical properties of the high-chromium cast iron alloy are obviously improved.

Description

technical field [0001] The technical scheme of the invention relates to a chromium-containing cast iron alloy, in particular to a high-chromium cast iron composite inoculant and its preparation method and application. Background technique [0002] With the continuous development of construction machinery such as paver, cement asphalt mixing plant, crusher, brick making machine and coal washing machine, the demand for high chromium cast iron wear parts such as blade liners, blades, and knife angles of various types The mechanical properties put forward more and more stringent requirements. Relevant scholars and technicians have done some experimental research on how to improve the mechanical properties and wear and corrosion resistance of high chromium cast iron wear parts for construction machinery. In the as-cast structure of general high-chromium cast iron alloys, the grains of the matrix structure are relatively coarse, the cementite phase in the eutectic ledeburite stru...

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Problems solved by technology

[0005] The preparation methods of the inoculants reported in the above-mentioned documents are all produced by traditional processes such as crushing and mixing. The application of these inoculants in cast iron alloy casting is smelted by ordinary smelting processes and the ingots are crushed into small pieces for use. The grain size of the refiner is far from nanoscale, so the refinement effect on the grain and structure of the cast iron alloy matrix is ​​not ideal

Practice has proved that the inoculants produced by these traditional processes are used to refine the grain and structure of the high-chromium cast iron alloy. In the as-cast structure of the refined high-chromium cast iron alloy, the eutectic ledeburite structure The cementite phase is still in a relatively coarse sheet shape, and the comprehensive mechanical properties of high-chromium cast iron alloys cannot be effectively improved.

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