Effect of quenching temperature on microstructure and mechanical properties of GE1014 ultra-high strength steel

doi:10.13251/j.issn.0254-6051.2022.02.022

Abstract

Abstract: Effect of quenching temperature on mechanical properties and microstructure of the GE1014 ultra-high strength steel was studied by means of mechanical property test, transmission electron microscope (TEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and other analysis methods. The results show that with the increase of quenching temperature, the tensile strength of the tested steel increases first and then decreases and the peak value is 2112 MPa when quenched at 925 ℃, the proof strength, plastic extension decreases slightly with the increase of quenching temperature. The reduction of area and U-notched impact property of the tested steel increase slowly with the increase of quenching temperature, and decrease at near 950 ℃. Both the prior austenite grain size and martensite block size of the tested steel increase with the increase of quenching temperature. When the quenching temperature exceeds 925 ℃, the prior austenite grain coarsens rapidly, while the martensite block grows slowly throughout the whole process. In the range of 850-925 ℃, the volume fraction of retained austenite in the matrix decreases significantly with the increase of quenching temperature. When the quenching temperature is lower than 900 ℃, there are spherical Mo-rich M₆C carbides in the tested steel, while when higher than 900 ℃, no insoluble phase is observed.

Key words: GE1014 steel, quenching temperature, mechanical properties, microstructure

CLC Number:

TG142.1

Liu Yue, Han Shun, Li Yong, Wang Chunxu, Yan Xiaohong, Li Jianxin. Effect of quenching temperature on microstructure and mechanical properties of GE1014 ultra-high strength steel[J]. Heat Treatment of Metals, 2022, 47(2): 125-129.

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