Very high cycle fatigue behaviors of Mn–Si–Cr series Bainite/Martensite dual phase steels

Yu, Yongtao; Gu, Jing; Xu, Li; Shou, Fenyong; Bai, Bin; Liu, Y.B.

doi:10.1016/j.matdes.2010.01.008

Cited by 40 publications

(20 citation statements)

References 20 publications

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“…The change from surface-induced fracture to interior-induced fracture is the typical fracture feature of some high-strength steels in the long life regime [3,[5][6][7][8][9][10]. Some metallurgical defects, such as non-metallic inclusions [3][4][5][6][7][8] or inhomogeneous microstructures [9,10] can play a very important role in causing the interior crack initiation.…”

Section: Introductionmentioning

confidence: 99%

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High Cycle Fatigue Property of Carburized 20Cr Gear Steel under Axial Loading

Liu

Nehila

et al. 2016

Metals

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Abstract:The high cycle fatigue property of carburized 20Cr gear steel was experimentally investigated under axial loading with a stress ratio of zero. The test results show that this steel exhibits gradually decreasing S-N characteristics, and the fatigue strength corresponding to 10 9 cycles is about 455 MPa. Based on the observation of fracture surfaces, the interior inclusion fisheye-induced fracture is the predominant fracture mode in the life regime beyond 10 5 cycles. The fine granular area (FGA) cannot be found clearly around the inclusion. Based on the evaluation of stress intensity factor ranges (∆K) at the front of inclusion and fisheye, the interior crack growth rate (da/dN) equation can be characterized by da/dN = 2.39 × 10 −21 (∆K) 12.32 . Corresponding to the tested specimen, the predicted maximum inclusion size is about 52.02 µm. The predicted fatigue strength corresponding to 10 9 cycles by using Wang's model is slightly higher than the experimental result, but that by using Murakami's model is relatively conservative.

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Section: Introductionmentioning

confidence: 99%

“…Some metallurgical defects, such as non-metallic inclusions [3][4][5][6][7][8] or inhomogeneous microstructures [9,10] can play a very important role in causing the interior crack initiation. A propagating fisheye-shaped crack can be observed on the fracture surface.…”

Section: Introductionmentioning

confidence: 99%

High Cycle Fatigue Property of Carburized 20Cr Gear Steel under Axial Loading

Liu

Nehila

et al. 2016

Metals

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“…The VHCF testing was conducted on a Shimadzu USF-2000 type ultrasonic fatigue testing machine (Fig.1b) with a resonance frequency of 20 kHz and stress ratio of R=−1. Compressed air was introduced to avoid significant "self-heating" in specimens during the VHCF testing [16]. The ultrasonic fatigue testing systems are highly accurate: the amplitudes can be measured up to ± 1% and the frequencies can also be recorded and controlled to ± 0.005%…”

Section: Test Materials and Experimental Methodsmentioning

confidence: 99%

“…The formation of SNDFCO was caused by local plastic deformation of soft phase (such as ferrite and austenite) [11][12]15]. Our previous work indicated that the VHCF properties of the designed bainite/martensite (B/M) multiphase steels are less sensitive to inclusions compared to tempered martensite steels, and "non-inclusion induced crack initiation" could be one of the most important fatigue failure mechanisms in VHCF regime [13][14]16]. By addition of Si, the carbide is replaced by retained austenite in B/M steels [17].…”

Section: Introductionmentioning

confidence: 99%

“…The microstructures of B/M multiphase steels consist of bainitic ferrite, martensite and retained austenite. Until now, the effect of retained austenite on VHCF behaviors of B/M multiphase high strength steels is still controversial [16,[18][19][20]. On one hand, compared with bainitic ferrite and martensite, the retained austenite is softer phase, which is prone to subject to local plastic deformation and become the crack initiation site.…”

Section: Introductionmentioning

confidence: 99%

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Very high cycle fatigue behaviors of bainite/martensite multiphase steel treated by quenching-partitioning-tempering process

Gao

Zhang

Cheng

et al. 2016

International Journal of Fatigue

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Influence of Transformation Temperature on the High‐Cycle Fatigue Performance of Carbide‐Bearing and Carbide‐Free Bainite

Gulbay,

Ackermann,

Gramlich

et al. 2023

steel research int.

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This study investigates the high‐cycle‐fatigue (HCF) behavior of carbide‐bearing bainite (CBB) and carbide‐free bainite (CFB) fabricated at different transformation temperatures. The fatigue limit of each material is determined via staircase method using a 1 kHz resonant testing machine. A new load increase test is proposed as an efficient alternative to estimate the fatigue limit in HCF regimes. The assessment of the fatigue behavior is accompanied by data‐driven microstructural analyses via state‐of‐the‐art computer vision tools. The analyses reveal that the finer carbide distribution, which is obtained at lower transformation temperature, enhances the overall performance of CBB. Electron backscatter diffraction (EBSD) measurements of CFB before and after tensile testing evidence the transformation of retained austenite (RA) to martensite during deformation. The finer film‐like and stable RAs, which are promoted via reduction in transformation temperature, enhance the HCF properties by absorbing the energy required for fatigue crack propagation through improved transformation‐induced plasticity. However, blocky unstable RA and/or martensite‐austenite (MA) islands at prior austenite grain boundaries deteriorate the HCF properties of high‐temperature CFB. Furthermore, unindexed regions in EBSD maps are effectively used to differentiate the MA islands of CFB, as validated by scanning electron microscopy (SEM) images and deep learning‐based MA island segmentation.

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Very high cycle fatigue behaviors of Mn–Si–Cr series Bainite/Martensite dual phase steels

Cited by 40 publications

References 20 publications

High Cycle Fatigue Property of Carburized 20Cr Gear Steel under Axial Loading

High Cycle Fatigue Property of Carburized 20Cr Gear Steel under Axial Loading

Very high cycle fatigue behaviors of bainite/martensite multiphase steel treated by quenching-partitioning-tempering process

Influence of Transformation Temperature on the High‐Cycle Fatigue Performance of Carbide‐Bearing and Carbide‐Free Bainite

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