Nanocrystalline high-chromium cast-iron composite nucleating agent for engineering machinery as well as preparation method and application method thereof

Abstract

The invention relates to a nanocrystalline high-chromium cast-iron composite nucleating agent for engineering machinery as well as a preparation method and an application method thereof and relates to chromium-contained cast-iron alloys. The nanocrystalline high-chromium cast-iron composite nucleating agent is a sheet nanocrystalline high-chromium cast-iron composite nucleating agent for the engineering machinery containing nanocrystalline rear-earth silicoferrite and Fe-Ti-B, comprises an Fe-Ce-Si-Ca interalloy and a Fe-Ti-B interalloy in a mass ratio of 100: (6.67-10.0), has a nanocrystalline grain size smaller than 100 nm and is prepared by adopting a centrifugal quenching and flinging method. Grains and texture of the high-chromium cast-iron alloys for the engineering machinery are produced and thinned by the nanocrystalline high-chromium cast-iron composite nucleating agent by a metal melting die-casting method so that substrate grains and a cementite phase of the high-chromium cast-iron alloys are remarkably thinned, cementite layered sheets and particles are further thinned, and the distribution is evener. In-situ generated TiB2 particles in high-chromium cast-iron liquid also take the action of enhancing a substrate, thereby obviously improving the comprehensive mechanical performance of the high-chromium cast-iron alloys for the engineering machinery.

Description

technical field [0001] The technical scheme of the invention relates to a chromium-containing cast iron alloy, in particular to a nanocrystalline high-chromium cast iron composite inoculant for construction machinery and a preparation and application method thereof. Background technique [0002] As a high wear-resistant material, high chromium cast iron is used in crushing, grinding and material conveying machinery and metallurgical equipment, especially in abrasive wear and impact wear parts, such as crusher drum, silo lining board, blast furnace bell, hopper, transportation It is widely used in coal channel liner, coal mill roll sleeve, roll and slurry pump flow parts. [0003] With the continuous development of new construction machinery, more and more stringent requirements are put forward for the mechanical properties of high chromium cast iron wear parts. Experimental studies by many scholars and technicians have found that: on the one hand, high-chromium cast iron ca...

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Problems solved by technology

However, the preparation methods of cast iron inoculants reported in the above-mentioned literatures are all produced by traditional processes such as crushing and mixing, and the application of these inoculants in cast iron alloy casting is smelted and crushed into small pieces by ordinary smelting processes. When used, the grain size of its refiner is several hundred microns, which is far from nanoscale, so the refinement effect on the grain and structure of the cast iron alloy matrix is ​​not ideal. In the as-cast structure of the refined high-chromium cast iron alloy In the middle, the cementite phase in the eutectic ledeburite structure is still in a relatively coarse sheet shape, and the comprehensive mechanical properties of the high-chromium cast iron alloy cannot be effectively improved.

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