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Very high cycle fatigue behavior of shot-peened 3Cr13 high strength spring steel
Highlights Shot-peening reduced fatigue life of 3Cr13 steel in the very high cycle regimes. Subsurface crack initiation and propagation mechanism were investigated. Fatigue life of SP specimens was predicted well with residual tensile stress.
Abstract The effect of shot peening (SP) on the very high cycle fatigue behavior of 3Cr13 high strength spring steel was investigated. The samples that underwent electro-polishing (EP) and SP treatments were analyzed at 20kHz by ultrasonic fatigue tests. The results showed that subsurface crack initiation occurred in both types of specimens at low stress amplitude. A fine granular area (FGA) was also observed in the vicinity of the inclusion. The stress intensity factor range at the front of the FGA was regarded as the threshold value that controls the stable internal crack propagation. The S–N curve decreased in very high cycle regime for both types of specimens, and the fatigue life for the subsurface initiation of the SP specimens was reduced compared with that of the EP specimens. Furthermore, the fatigue life of the internal crack in the FGA was estimated based on the crack propagation rate assuming Paris’ law. Considering the tensile residual stress in the interior of the SP specimens, the prediction of the S–N curves on the mean size of the non-metallic inclusions were consistent with the experimental results.
Very high cycle fatigue behavior of shot-peened 3Cr13 high strength spring steel
Highlights Shot-peening reduced fatigue life of 3Cr13 steel in the very high cycle regimes. Subsurface crack initiation and propagation mechanism were investigated. Fatigue life of SP specimens was predicted well with residual tensile stress.
Abstract The effect of shot peening (SP) on the very high cycle fatigue behavior of 3Cr13 high strength spring steel was investigated. The samples that underwent electro-polishing (EP) and SP treatments were analyzed at 20kHz by ultrasonic fatigue tests. The results showed that subsurface crack initiation occurred in both types of specimens at low stress amplitude. A fine granular area (FGA) was also observed in the vicinity of the inclusion. The stress intensity factor range at the front of the FGA was regarded as the threshold value that controls the stable internal crack propagation. The S–N curve decreased in very high cycle regime for both types of specimens, and the fatigue life for the subsurface initiation of the SP specimens was reduced compared with that of the EP specimens. Furthermore, the fatigue life of the internal crack in the FGA was estimated based on the crack propagation rate assuming Paris’ law. Considering the tensile residual stress in the interior of the SP specimens, the prediction of the S–N curves on the mean size of the non-metallic inclusions were consistent with the experimental results.
Very high cycle fatigue behavior of shot-peened 3Cr13 high strength spring steel
Nie, Baohua (author) / Zhang, Zheng (author) / Zhao, Zihua (author) / Zhong, Qunpeng (author)
2013-03-01
6 pages
Article (Journal)
Electronic Resource
English
Very high cycle fatigue behavior of shot-peened 3Cr13 high strength spring steel
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