Effects of Si content and quenching temperature on microstructure and  properties of Q&P steel

doi:10.13251/j.issn.0254-6051.2022.03.025

Abstract

Abstract: Two kinds of tested steels with different silicon contents were quenched and partitioned by using salt bath, and microstructure and properties of the tested steels quenched at different temperatures were investigated by means of metallographic microscope, scanning electron microscope and tensile testing machine. The results indicate that microstructure of the tested steels is composed of ferrite, martensite, retained austenite and bainite. With the increase of silicon content, the volume fraction of retained austenite increases marginally, the tensile strength and yield strength increase significantly, and the elongation decreases. In addition, the strength fluctuates slightly with quenching temperature. After quenching at 260 ℃ and partitioning at 360 ℃, the tested steel with 2.13%(mass fraction) Si obtains high strength and good elongation simultaneously, the tensile strength is 958.66 MPa, the yield strength is 458.99 MPa, the elongation and product of strength and elongation reach 15.35 % and 14.66 GPa·%, respectively, therefore, the comprehensive mechanical properties are optimum.

Key words: quenching and partitioning, silicon content, quenching temperature, product of strength and elongation

CLC Number:

Shi Na, Liu Weiming, Liu Yonggang, Zhan Hua, Cui Lei, Pan Hongbo. Effects of Si content and quenching temperature on microstructure and properties of Q&P steel[J]. Heat Treatment of Metals, 2022, 47(3): 130-135.

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Effects of Si content and quenching temperature on microstructure and properties of Q&P steel

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