Crack growth behavior of low-alloy bainitic 51CrV4 steel

Lambers, Hans; Gorny, B.; Tschumak, S.; Maier, Hans Jürgen; Canadinç, D.

doi:10.1016/j.proeng.2010.03.149

Cited by 6 publications

(5 citation statements)

References 20 publications

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“…Accordingly, under 50 MPa constant tensile stress, the increase in the rate of transformation is not significant as compared with the stress-free transformation. Under 140 MPa constant stress, which is still below the yield strength of the supercooled austenite [36], a significant increase in the rate of transformation is notable. This can be attributed to the large MDFs resolved on the bainitic variants, whose magnitudes are large enough to influence the nucleation rate as compared with that of the chemical driving force available in the system, and thus, influence the transformation kinetics.…”

Section: Resultsmentioning

confidence: 96%

Modeling the role of external stresses on the austenite-to-bainite phase transformation in 51CrV4 steel

Uslu

Canadinç

Lambers

et al. 2011

Modelling Simul. Mater. Sci. Eng.

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A new model is proposed to successfully predict the initiation and evolution of the austenite-to-bainite phase transformation, capturing specifically the time-dependent transformation kinetics. In particular, the isothermal bainitic transformation in 51CrV4 steel is experimentally observed for various constant stress conditions, and significant improvement is obtained in comparison with the existing models. Specifically, both the transformation kinetics and the resultant transformation strains can be simultaneously predicted using the same variant growth approach. Simulation results are in good agreement with the experiments, evidencing the success of the proposed model in describing the transformation phenomena in terms of kinetics and transformation plasticity. Furthermore, the proposed formulation provides a basis for incorporating variant–variant interactions and cementite formation in the residual austenite matrix.

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Section: Resultsmentioning

confidence: 96%

Modeling the role of external stresses on the austenite-to-bainite phase transformation in 51CrV4 steel

Uslu

Canadinç

Lambers

et al. 2011

Modelling Simul. Mater. Sci. Eng.

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“…Sıcaklığın mekanik özelliklere olan etkisi sertlik bakımından incelendiğinde numunelerin sertlik değerlerinde çok büyük bir fark görülmese de, çentik darbe dayanımları incelendiğinde daha yüksek sıcaklıkta menevişleme işlemi uygulanan numunenin darbe dayanımının ve dolayısı ile tokluğun daha yüksek olduğu gözlemlenmiştir. İzotermal beynitik dönüşüm sırasında mevcut gerilme durumunun, çatlak büyüme yönü, faz dönüşümüne tabi tutulan orijinal numunenin yükleme eksenine dik olduğunda, eşik seviyesine yakın rejimdeki çatlak yayılma davranışı üzerinde güçlü bir etkiye sahip olduğunu göstermiştir [18].…”

Section: şEkil 6 Farklı Işlemler Uygulanmış 51crv4 Malzemelerin çEkme Testi Sonuçlarını Gösteren Grafikunclassified

FARKLI MENEVİŞLEME SICAKLIKLARININ 51CrV4 ÇELİĞİNİN MEKANİK ÖZELLİKLERİNE ETKİLERİNİN İNCELENMESİ

Durmuş

Çakir

Gül

2020

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, samples of 51CrV4 steel tempered at two different temperatures after annealing and oil cooling were examined. The changes in the morphology and mechanical properties of the samples processed at different temperatures were analyzed. The effects of tempering on wear resistance were discussed. Figure A. Schematic representation of experimental studies Purpose: The aim of the study is to discuss and compare the effects of different tempering temperatures on microstructure and mechanical properties. Theory and Methods: Samples of 51CrV4 steel were annealed at 970 °C and oil cooled. Then, they were tempered at 220 °C and 315 °C and examined. Microstructures and morphological changes of steel samples were examined using optical microscope, SEM-EDS and XRD. Changes in mechanical properties were examined by tensile, charpy impact and dry sand rubber wheel abrasion tests. Results: Results show that two different microstructures consisting of carbide sediments in the ferritic matrix and containing a bainitic structure were reached. No significant difference was observed in the hardness measurements taken from the section and the surface. However, as a result of the tensile, charpy impact, and dry sand rubber wheel abrasion tests, significant differences were observed between the sample groups and it was concluded that the most suitable tempering temperature was 315 °C. Conclusion: 51CrV4 steel were tempered at two different temperatures after annealing and oil cooling and examined in this study. The changes in the morphology and mechanical properties of the samples processed at different temperatures were analyzed and presented.

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“…Not only that, the quenching and tempering process affect crack propagation behaviour. According to investigations carried out on low-alloy bainitic steel (51CrV4), the effect of heat treatment is beneficial for the propagation threshold value [15]. Testing a 51CrV4 low-alloy bainitic steel for different stress ratios and propagation directions, a significant influence was found for both cases in propagation regime I, however, this effect starts being irrelevant as the crack enters in the propagation regime II.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Propagation of 51CrV4 Steels for Leaf Springs Suspensions of Railway Freight Wagons

Gomes,

Lesiuk,

Correia

et al. 2024

Preprint

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Leaf springs are critical components for the railway vehicle safety in which they are installed. Although these components are produced in high-strength alloyed steel and designed to operate under cyclic loading conditions in the high-cyclic fatigue region, their failure is still possible to occur and hence lead to economic and human catastrophes. The aim of this document is precisely to characterise the mechanical crack growth behaviour of the 51CrV4 spring steel representative of leaf springs under cyclic conditions, that is, crack propagation in mode I. The common fatigue crack growth prediction models (Paris and Walker) considering the effect of stress ratio and parameters such as propagation threshold, critical stress intensity factor and crack closure ratio are also determined using statistical methods, which resulted in good approximations with respect to the experimental results. Lastly, the fracture surfaces under the different test conditions were analysed using SEM, with no significant differences to declare. As a result of this research work, it is expected that the developed properties and fatigue crack growth prediction models can assist design and maintenance engineers in understanding fatigue behaviour in the initiation and propagation phase of cracks in leaf springs for railway freight wagons.

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Crack growth behavior of low-alloy bainitic 51CrV4 steel

Cited by 6 publications

References 20 publications

Modeling the role of external stresses on the austenite-to-bainite phase transformation in 51CrV4 steel

Modeling the role of external stresses on the austenite-to-bainite phase transformation in 51CrV4 steel

FARKLI MENEVİŞLEME SICAKLIKLARININ 51CrV4 ÇELİĞİNİN MEKANİK ÖZELLİKLERİNE ETKİLERİNİN İNCELENMESİ

Fatigue Crack Propagation of 51CrV4 Steels for Leaf Springs Suspensions of Railway Freight Wagons

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