High-temperature-resistant alloy casting and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant alloy casting and a preparation method thereof. The alloy casting comprises the following chemical components by mass percent: 0.10% to 0.18% of C, 2.0% to 2.6% of Si, less than or equal to 1% of Mn, less than or equal to 0.045% of P, less than or equal to 0.045% of S, 19% to 23% of Cr, 36% to 40% of Ni, 1.5% to 2.0% of Mo, 0.50% to 0.65% of B, 3.5% to 4.5% of W, 1.0% to 1.4% of Al, 2.0% to 2.6% of Ti, 2% to 3% of Co, 0.05% to 0.15% of Ce and the balance of Fe. The preparation method comprises the following steps of the preparation of a wax mould; the preparation of a mould shell; smelting; and pouring. The as-cast hardness of the alloy casting is HB273-285; and an as-cast metallographic structure of the alloy casting is composed of a fine and small dendritic austenite r, a precipitation strengthening phase r', an intermetallic compound, a metal carbide and a metal boride. The obtained inner core cup casting is strong in high-temperature creep resistance, high-temperature resistance and oxidation resistance and is high in strength and stability under a high-temperature condition, so that the long service life of the casting is realized.

Description

technical field [0001] The invention relates to a casting material and a preparation method, in particular to a high-temperature-resistant, high-hardness alloy material casting and a preparation method of the casting, belonging to the technical field of metal materials. Background technique [0002] At present, in the new combustion equipment, the inner core cup is the core component. The inner core cup is a rectangular truncated cone-shaped thin-walled structure, the casting wall thickness is 5mm, and the side wall of the inner cup is provided with multiple air outlets. When the inner core cup is working, it has been in the environment of 60% gasification, 40% carbonization, alternating high temperature, alternating heat and high pressure, and the temperature is greater than 1140°C for a long time. The material of existing inner core cup is mostly heat-resistant steel ZG40Cr25Ni20. In a high-temperature environment, Ni forms the main phase face-centered structure r' relat...

AI Technical Summary

Problems solved by technology

When the inner cup works again, a large amount of dust particles are mixed in the vortex-shaped hot high-pressure airflow formed at the bottom of the inner cup, and the combustion environment further deteriorates

Under the action of alternating high temperature and high pressure, the inner cup continuously expands at high temperature, shuts down and cools down, and generates internal stress, which leads to deformation, oxidation and damage of the inner cup. Process of core cup deformation and fracture

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