Effects of quenching and tempering on microstructure and properties of 10Cr5MoVRE steel and second phase precipitation behavior

doi:10.13251/j.issn.0254-6051.2021.02.021

Abstract

Abstract: Taking 10Cr5MoVRE steel as the research object, the microstructure and properties of as-rolled and quenched+tempered(QT) specimens were compared, and the precipitates of quenched+tempered specimens were observed and analyzed by means of TEM and energy spectrometer. The mechanical property test results show that the strength and toughness of the quenched+tempered specimens are matched, and the elongation is increased by 93.8% and the impact abserbed energy under the condition of 0 ℃ is increased by more than 6 times compared with that of the rolled one. With the help of the SEM observation, the low temperature impact fracture morphology of the rolled specimen is brittle cleavage fracture and the quenched+tempered specimen is ductile dimple fracture. By means of OM observation and analysis, the microstructure of the rolled specimen is granular bainite and the quenched+tempered specimen is tempered sorbite. The second phase precipitates of the quenched+tempered 10Cr5MoVRE steel specimen were observed and analyzed by means of TEM and energy spectrometer, the results show that the carbide precipitates are mainly compound phase composed of vanadium carbide, molybdenum carbide and chromium carbide, while the inclusions is composed of Al₂O₃, MnS, Ca₃(PO₄)₂ and rare earth compounds.

Key words: 10Cr5MoVRE steel, quenching+tempering(QT), mechanical properties, microstructure, the second phase

CLC Number:

Shi Xiaoxia, Li Xiao, Ren Huiping, Jin Yan, Jia Pengxia. Effects of quenching and tempering on microstructure and properties of 10Cr5MoVRE steel and second phase precipitation behavior[J]. Heat Treatment of Metals, 2021, 46(2): 125-129.

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