Effect of rapid tempering on microstructure and properties of 690 MPa grade steel plate for construction machinery

doi:10.13251/j.issn.0254-6051.2023.09.012

Abstract

Abstract: Effects of three different tempering heating rates of 20, 30 and 40 ℃/s and tempering time after offline quenching on microstructure and mechanical properties of a 690 MPa grade steel plate for construction machinery were studied by using OM, TEM and mechanical properties tests. The results show that the tempering heating rate has little influence on the tensile strength of the steel plate, while the yield strength changes significantly with the increase of tempering holding time. The microstructure of the steel plate is bainite+ferrite mostly after tempering, with the prolonging of tempering holding time, and the amount of ferrite increases, especially, the specimen with 15 min of holding time shows stable properties. Through analysis of the precipitates inside the specimen with 15 min of holding time, it is found that with the increase of tempering heating rate, the carbide aggregation phenomenon inside the steel plate first decreases and then increases, and the comprehensive mechanical properties of the specimen at 30 ℃/s is the best.

Key words: construction machinery, quenching, rapid tempering, bainite, precipitate

CLC Number:

TG156.6

Li Deming, Lei Ningning, Zhang Jingang, Gong Tao, Zhou Guanghao. Effect of rapid tempering on microstructure and properties of 690 MPa grade steel plate for construction machinery[J]. Heat Treatment of Metals, 2023, 48(9): 75-80.

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