DECREASING MECHANICAL PROPERTIES OF THE SUPERHEATER STEEL GRADE P22 HEATED AT ELEVATED TEMPERATURE UNDER CONSTANT STRESS

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-12-13 DOI:10.36547/ams.28.4.1610

A. Bui, C. Nguyen, ThuHien Nguyen

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Abstract

This paper investigated change of the mechanical properties of the superheater pipe steel grade P22 (ASTM A335) under constant stress of 9.68 MPa and various temperatures of 500-700 oC. The steel specimens were prepared from the new steel pipe taken from a coal-fired power plant in Vietnam, then heated to the given temperature and held for the predetermined time as 24, 48 and 72 hours in the atmosphere. The results showed that the mechanical properties of the steel P22 decreased with the increased temperature and time. This deterioration of the steel strength was caused by the redistribution of the carbide in the steel subjected under the elevated temperature and the constant stress. Although change in the microstructure including phase and grain size was not observed, the SEM micrographs showed that the carbide of the heated steel accumulated on the grain boundaries and the triple regions when the temperature and holding time increased. This phenomenon was attributed to reduce number of the carbide in the steel, resulting in decrease of the mechanical properties. The obtained results indicated that decrease of the mechanical properties of the steel pipe P22 can occur in the early period of working time in the practice.

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P22级过热器在恒定应力作用下的力学性能下降

本文研究了P22级过热器管钢（ASTM A335）在9.68MPa的恒定应力和500-700℃的不同温度下的力学性能变化。钢试样由取自越南燃煤发电厂的新钢管制备，然后加热至给定温度，并在大气中保持24、48和72小时的预定时间。结果表明，P22钢的力学性能随着温度和时间的升高而降低。钢强度的这种劣化是由在高温和恒定应力下钢中碳化物的重新分布引起的。虽然没有观察到包括相和晶粒尺寸在内的微观结构的变化，但SEM显微照片显示，随着温度和保温时间的增加，加热钢的碳化物积聚在晶界和三重区。这是由于钢中碳化物数量减少，导致力学性能下降所致。研究结果表明，在实际生产中，P22钢管的力学性能在使用初期会出现下降。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.