Effect of Quench Rate on the High Cycle Fatigue Property of 60Si2CrVAT Spring Steels

doi:10.11901/1005.3093.2016.118

Chinese Journal of Materials Research

2017, Vol. 31

Issue (1): 65-73 DOI: 10.11901/1005.3093.2016.118

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Effect of Quench Rate on the High Cycle Fatigue Property of 60Si2CrVAT Spring Steels

Lei LEI^1,^2,⁴,Yilong LIANG^1,^2,⁴(

),Yun JIANG^1,^2,³,Jun XU^1,^2,⁴,Ming YANG^1,^2,⁴

1 College of Materials and Metallurgy,University of Guizhou,Guiyang 550025,China
2 Key Laboratory for Material Structure and Strength of Guizhou Province,Guiyang 550025,China
3 College of Mechanical Engineering,University of Guizhou,Guiyang 550025,China
4 National Local Co-construction Engineering Laboratory for High Performance Metal Structure Material and Manufacture Technology,Guiyang 550025,China

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Lei LEI,Yilong LIANG,Yun JIANG,Jun XU,Ming YANG. Effect of Quench Rate on the High Cycle Fatigue Property of 60Si2CrVAT Spring Steels. Chinese Journal of Materials Research, 2017, 31(1): 65-73.

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Abstract

The effect of quench with two quenching media of 13% polyaleneglycol (PAG) and oil respectively on the high cycle fatigue behavior of spring steel 60Si2CrVAT was studied by applying alternatively uniaxial tension and compression. While the fatigue fractograph,source composition,microstructural evolution of the steel were examined by means of SEM,TEM and EBSD. The results indicate that the fatigue limit for the steel quenched with 13%PAG is 781.5 MPa; however that with oil is 714.0 MPa. Analysis results of fractograph show that fatigue damages mostly originate from the internal inclusions and carbides,while granular bright facets (GBF) are observed in the vicinity around the inclusions. Further investigation indicates that the stress intensity factor range at crack initiation site of inclusion ?Kinc trends to decrease gradually with increasing the fatigue life N_f,while the stress factor range at GBF boundary ?KGBF keeps almost constant with varying N_f and the ?KGBF for the steel quenched with oil is smaller than that with 13% PAG. From microstructural observation results,it suggests that the beneficial effect on the fatigue property of the steel quenched with 13%PAG is caused by that there existed much more nano-twins,much finer individual lath and block,as well as finer carbides uniformly distributed in martensitic matrix for the steel quenched with 13% PAG rather than those with oil.

Key words: metallic materials 60Si2CrVAT spring steels quench rate high cycle fatigue inclusion microstructure

Received: 07 March 2016

Fund: Supported by National Natural Science Foundation of China (No.51461006), Guiyang Science and Technology Support Program (No.2013101) and Key Projects in Guizhou Province (No.20146012) and Key Projects in Guizhou Province (No.JZ[2014]2003)

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	Lei LEI
	Yilong LIANG
	Yun JIANG
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	Ming YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.118 OR https://www.cjmr.org/EN/Y2017/V31/I1/65

Table 1 Chemical composition of the tested steel(mass fraction, %)

Fig.1 Geometry of the fatigue test specimen (unit: mm)

Fig.2 The cooling property of different quenching medium

Fig.3 The tensile stress-strain curves of different quenching medium

Fig.4 The fatigue limit of 60Si2CrVAT spring steel quenched by 13% PAG (a), and quenched by oil (b), and the S-N curveof60Si2CrVAT spring steel quenched by 13%PAG (c), and quenched by oil (d)

Table2 The mechanical properties of two kinds of quenching medium

Fig.5 SEM fractographs of 13%PAG showing a“fish-eye” with an inclusion in the fish-eye center (a), a GBF (granular bright facet)surrounding the inclusion (b), and its high-reservation (c), and energy spectrum of the inclusion (d) (σ=770 MPa, N_f=1.585×10⁶ cycle)

Fig.6 SEM fractographs of oil showing a“fish-eye” with an inclusion in the fish-eye center (a), a GBF (granular bright facet) surrounding the inclusion (b), and its high-reservation (c), and energy spectrum of the inclusion (d) (σ=730 MPa, N_f=9.9577×10⁶)

Fig.7 Relationship between stress intensity factor range at the inclusion of △Kinc and N_f, showing an increasing tendency of N_f with the decreasing of △Kinc(a), and ?KGBF at the GBF at the fracture source and N_f, showing an almost independence tendency of N_f with ?KGBF(b)

Fig.8 EBSD images of microstructure of 13%PAG and oil (b)

Fig.9 TEM images of lath martensite microstructures of 13%PAG (a), oil (b), and the twinning structure of 13%PAG (c)

Fig.10 TEM morphology and distribution of carbide of 13%PAG (a), (b), and oil (c)

Fig.11 The fatigue strip of 13%PAG (σ=770 MPa, N_f=1.585×10⁶) (a) and oil (σ=730 MPa, N_f=9.9577×10⁶) (b)

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