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Chinese Journal of Materials Research  2016, Vol. 30 Issue (12): 955-960    DOI: 10.11901/1005.3093.2016.106
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Ultrahigh Cycle Fatigue Damage Mechanisms of High Strength 50CrVA Spring Steel Regulated by Heat Treatment Process
Mengjiao ZHOU,Hong WANG(),Ben WANG
Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanicas and Engineening, Southwest Jiaotong University, Chengdu 610031, China
Cite this article: 

Mengjiao ZHOU,Hong WANG,Ben WANG. Ultrahigh Cycle Fatigue Damage Mechanisms of High Strength 50CrVA Spring Steel Regulated by Heat Treatment Process. Chinese Journal of Materials Research, 2016, 30(12): 955-960.

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Abstract  

Ultrahigh cycle fatigue behavior of 50CrVA spring steel, which was treated successively byquenched, tempered (QT) and annealed (AD) processes, was investigated by ultrasonic fatigue testingtechnique. The results showed that in ultra-long life regimes (107~109 cycles) the fatigue damage occurred, and the S-N curves displayed different forms. Different heat treatment process could induce different microstructure of the steel; there with regulate the relevant ultrahigh cycle fatigue damage mechanism. In QT state, fatigue cracks generally originated from inner oxide inclusions. It was probably due to that elastic interaction between microcrack tip stresses and interstitial atoms, which enable carbon atoms to be enriched around the particles, causing the degradation of performance of the region rich in carbon and initiation of fatigue cracks. In AD state, the enrichment of interstitial atoms was difficult due to that the special microstructure inhibited the diffusion of atoms approaching to impurity particles so that the cracks were prone to initiate from the steel surface.

Key words:  metallic materials      50CrVA spring steel      ultrahigh cycle fatigue      heat treatment      granular bright facet (GBF)      interstitial atom diffusion     
Received:  28 February 2016     
Fund: *Supported byYouth Science and Technology Innovation Team of Sichuan Province No. 2013TD0004.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2016.106     OR     https://www.cjmr.org/EN/Y2016/V30/I12/955

Fig.1  Dimensionof specimens tested by ultrasonic fatigue system (Unit: mm)
Fig.2  Optical microscope (OM) images of 50CrVA spring steeltreated by (a) quenched and tempered (QT) and (b) annealed (AD) process
Heat treatment process Tensile strength
Rm/MPa
Yield strength
ReL/MPa
Elongation
A/%
QT 1250 1120 12
AD 985 820 28
Table 1  Mechanical properties of 50CrVA spring steel specimens after heating treatment
Fig.3  S-N fatigue curves of 50CrVA spring steel specimens after QT (a) and AD (b)
Fig.4  Scanning electron microscope (SEM) micrographs of fracture surface of 50CrVA spring steel tested by ultrahigh cycle fatigue after heating treatment: (a) QT, σ=833 MPa, Nf=5.10×108; (b) QT, σ=833 MPa, Nf=5.10×108; (c) AD, σ=550 MPa, Nf=2.60×108; (d) AD, σ=700 MPa, Nf=1.12×106
Areas Matrix Area A Area B
Carbon content 0.51 8.30 0.35
Table2  Carbon content of internal and external regions of GBF (%, mass fraction)
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