Research status of failure mechanisms of heat-resistant steel in thermal power units

doi:10.13251/j.issn.0254-6051.2021.05.003

Abstract

Abstract: Effectively improving the fuel combustion utilization rate of thermal power units is the main means of modern society to alleviate the energy crisis and relieve the pressure. Appropriately increasing the steam parameters of the unit can increase the thermal cycle efficiency, and greatly improve the energy utilization rate, but the performance requirements of the unit components are more restricted. Heat-resistant steel is widely used in the parts of thermal power boilers because of its excellent high temperature oxidation, thermal strength and low cost. This article introduces the microstructure of three heat-resistant steels including 25Cr2MoVA, T91 and Super 304H after different heat treatments, analyzes the high-temperature mechanical properties of the heat-resistant steels at different temperatures, and summarizes the failure mechanisms of the heat-resistant steels during service. In addition, the research status of oxide film on the surface of the heat-resistant steel is emphasized, and the application of using oxide film thickness to predict the remaining service life of metal parts is prospected.

Key words: thermal power unit, heat-resistant steel, heat treatment, high temperature corrosion, oxide film, creep

CLC Number:

TG142.73

Yang Hao, Si Yu, Cao Pengjun, Li Kejian. Research status of failure mechanisms of heat-resistant steel in thermal power units[J]. Heat Treatment of Metals, 2021, 46(5): 14-24.

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