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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 |
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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.
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Received: 28 February 2016
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| Fund: *Supported byYouth Science and Technology Innovation Team of Sichuan Province No. 2013TD0004. |
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