Fine-grained high carbide cast iron alloys

Abstract

Embodiments of alloys having high, fine-grained carbide content, and methods of manufacturing such alloys. The alloys can be determined through the use of thermodynamic, microstructural, and compositional criterial in order to create a high strength and high toughness alloy. In some embodiments, the alloys can be used as a wear resistant component.

Description

INCORPORATION BY REFERENCE TO ANY PRIORITY APPLICATIONS[0001]Any and all applications for which a foreign or domestic priority claim is identified in the Application Data Sheet as filed with the present application are hereby incorporated by reference under 37 CFR 1.57.BACKGROUND[0002]1. Field[0003]The disclosure relates generally to cast iron alloys used in wear-prone environments and which are resistant to wear.[0004]2. Description of the Related Art[0005]The alloy family known as chromium white irons or chromium white cast irons can refer to alloys containing Fe, C, and Cr which can form eutectic chromium carbides. For example, alloys having chromium levels in the range from 15-30 wt. % (or about 15 to about 30 wt. %) and having carbon levels in the range of 1-3 wt. % (or about 1 to about 3 wt. %) can form such chromium white irons. For chromium white irons, formation of primary chromium carbides is typically avoided which can occur as either Cr or C content is increased. For man...

AI Technical Summary

Benefits of technology

The patent text describes a new method for creating alloys with high carbide content that do not have coarse carbides that can damage the material. The method uses computational metallurgy to explore the limits of carbide content without creating these harmful structures. The resulting alloys have a high level of fine-grained carbides, which can improve wear resistance without sacrificing toughness. The alloys can be used in various applications such as wear-resistant components and pipelines designed to carry abrasive slurries. The total carbide and boride content in the microstructure can exceed 40 volume% and the grain size of all carbides and borides can not exceed 50 micrometers in their longest dimension.

Problems solved by technology

However, this is done at the expense of toughness.

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