Internal friction analysis on austenitizing process of E690 steel

doi:10.13251/j.issn.0254-6051.2020.08.003

Abstract

Abstract: Effect of austenitizing temperature and holding time on carbides dissolved amount of E690 steel was studied by means of measuring internal friction, hardness testing and microstructure analysis. The results show that, when the austenitizing temperature is lower than Ac₃ point, the strength of SKK peak can be significantly increased with the increase of temperature, and the dissolved amount of carbides is also increased. When the austenitizing temperature is over the Ac₃ point, the strength of SKK peak does not change obviously with the increase of temperature and holding time, the degree of carbide dissolution in the steel is relatively high. Besides, the structure of coarsened martensite can be observed by the process of an extended holding time. The carbides in the steel can completely be dissolved during austenitizing for 5 min, in which the microstructure is a martensite with a relatively small distribution of strips. Therefore, it is feasible that the efficient of quenching and tempering is improved through selecting shorter holding time when the temperature is appropriately over Ac₃ point.

Key words: austenitizing temperature, holding time, internal friction, carbide dissolving

CLC Number:

TG156.1

Du Xiaojie, He Yizhu. Internal friction analysis on austenitizing process of E690 steel[J]. Heat Treatment of Metals, 2020, 45(8): 12-16.

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