Influence of austenitizing and tempering temperature on microstructure and properties of E550 low-temperature steel

doi:10.13251/j.issn.0254-6051.2021.01.012

Abstract

Abstract: Microstructure evolution rules of E550 steel austenitized between 850-1000 ℃ and microstructure and properties when quenched and tempered at different temperature were studied by means of OM,SEM,tensile and impact machines.A mathematical model of the relationship between austenitizing temperature and austenite grain size has been established.The results show that the calculated results of the model is in good agreement with the measured values.The microstructure and mechanical properties of the test plates quenched at different temperatures and then tempered at 600 ℃ and 670 ℃ show that prior autstenite grains are fine and uniform when the austenitizing temperature is selected in the range of 880-930 ℃ and a good combination properties can be obtained when tempered at 670 ℃.

Key words: austenitizing temperature, tempering temperature, grain size, mathematical model, strength and toughness

CLC Number:

TG142.1

Xie Zhanglong, Chen Feng, Hu Qilong, Wang Zhaohua. Influence of austenitizing and tempering temperature on microstructure and properties of E550 low-temperature steel[J]. Heat Treatment of Metals, 2021, 46(1): 65-69.

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