Anisotropy effects on the fatigue behaviour of rolled duplex stainless steels

Mateo, A.; Llanes, L.; Akdut, N.; Stolarz, J.; Anglada, M.

doi:10.1016/s0142-1123(02)00173-1

Cited by 49 publications

(28 citation statements)

References 13 publications

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“…This orientation of the microstructure is often held responsible for mechanical anisotropy and can result in considerable variation of the fatigue limit, depending on the fiber orientation. This variation has been reported as being 35% for 42CrMo4 steel [1] and 15% for a duplex stainless steel [2].…”

Section: Introductionmentioning

confidence: 79%

“…For instance, Mateo [2] and Lütjering [10] showed that for a duplex stainless steel and an aluminium alloy the anisotropic monotonic mechanical properties do not necessarily follow the same trend as the anisotropic high cycle fatigue behaviour. They reported that the layered or pancake microstructure in the rolled plate from which the specimens were machined causes a significant drop in the fatigue limit when the effective slip length is a maximum.…”

Section: Experimental Anisotropic Fatigue Behaviour In Metallic Matermentioning

confidence: 99%

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Modelling the role of non-metallic inclusions on the anisotropic fatigue behaviour of forged steel

Pessard

Morel

et al. 2011

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractForged components are known to show high cyclic and monotonic mechanical properties. This is mainly due to a better compactness and a finer microstructure introduced by the forming process. However, this good mechanical behaviour is sometimes a source of anisotropy especially when the microstructural heterogeneities are not randomly distributed and/or oriented. This study aims at describing the high cycle fatigue response of a forged bainitic steel. This material contains a lot of elongated manganese sulphide (MnS) inclusions, oriented as a function of the rolling or forging direction. Specimens with different orientations relative to the rolling direction are tested in fatigue under push-pull uniaxial and torsion loads.The influence of "inclusion clusters" is clearly demonstrated via the observation of the failure surfaces. Experiments show that the anisotropic fatigue behaviour is due to a change in the crack initiation mechanism. At 0°, when the inclusions are parallel to the applied stress, micro-crack initiation is controlled by the material matrix. At 45° and 90°, elongated manganese-sulfide inclusion clusters are the origin of crack initiation and the fatigue strength drops significantly.A statistical approach based on the competition between two different crack initiation mechanisms is proposed. One mechanism is modelled by local elastic shakedown concepts and the other by linear elastic fracture mechanics. This approach leads to a Kitagawa type diagram and explains the anisotropy in the material. The approach developed in this study demonstrates a framework using both the elastic shakedown concept and the weakest link theory to account for the loading mode, loading path and data scatter in High Cycle Fatigue.

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Section: Introductionmentioning

confidence: 79%

Section: Experimental Anisotropic Fatigue Behaviour In Metallic Matermentioning

confidence: 99%

Modelling the role of non-metallic inclusions on the anisotropic fatigue behaviour of forged steel

Pessard

Morel

et al. 2011

International Journal of Fatigue

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“…Este evento foi observado tanto na amostra do aço no estado como recebido (Figura 5-a) quanto nas amostras do aço após todos os tratamentos térmicos (Figuras 5-a até 5-g) e pode estar relacionado com a orientação cristalográfica de cada fase. Mateo et al [20] e El Bartali et al [21], ao caracterizar aços inoxidáveis duplex laminados, observaram que a fase α tende ao desenvolvimento de textura, fato que pode explicar a dissolução uniforme desta fase, uma vez que a maioria dos grãos estão orientados aproximadamente na mesma direção. Por outro lado, a fase γ pode ter apresentado diferentes graus de dissolução devido a sua ausência de textura, ou seja, maior aleatoriedade de orientação cristalográfica.…”

Section: Resultsunclassified

Utilização Da Microscopia De Força Atômica No Estudo Da Fragilização a 475ºc Em Um Aço Inoxidável Lean Duplex

Reis¹,

Godefroid²,

Andrade³

2018

ABM Proceedings

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ResumoNeste trabalho, a microscopia de força atômica foi empregada para estudo da evolução da fragilização a 475ºC em um aço inoxidável lean duplex. Para tal, amostras deste aço foram submetidas a tratamentos isotérmicos com duração variando entre 1 e 100 horas na temperatura de 475ºC. Ensaios de tenacidade ao impacto e de dureza foram realizados para confirmar a ocorrência da decomposição da fase α. Posteriormente foram realizadas análises no microscópio de força atômica. Os ensaios de tenacidade ao impacto e de dureza indicaram que ocorreu decomposição espinodal da fase α. Medições da diferença da dissolução das fases α e γ, conduzidas no microscópio de força atômica, indicaram que a resistência à dissolução da fase α diminui com o tempo de envelhecimento de forma similar a redução da tenacidade. Os resultados indicam que a microscopia de força atômica é uma ferramenta eficiente para avaliar o grau de evolução da fragilização a 475ºC. Palavras-chave: Microscópio de força atômica; Aços inoxidáveis duplex; Fragilização a 475ºC; Fase α'. USING OF ATOMIC FORCE MICROSCOPY TO STUDY OF THE EMBRITTLEMENT AT 475ºC OF A LEAN DUPLEX STAINLESS STEEL AbstractIn this work, the atomic force microscopy was employed to study the evolution of the embrittlement at 475ºC of a lean duplex stainless steel. For this, samples of this steel were subjected to isothermal treatments with duration between 1 to 100 hours in the temperature of 475ºC. Tests of impact toughness and hardness were carried out to confirm the occurrence of α phase decomposition. Atomic force microscopy analyzes were performed. The impact toughness and hardness tests indicated that α spinodal decomposition has occurred. Measurements of the difference in α and γ phases dissolution, carried out by atomic force microscopy, indicated that the α phase dissolution resistance decreased with time of ageing in the same way as the toughness reduction. The results indicated that the atomic force microscope is an efficient tool to assess the evolution of the embrittlement at 475ºC.

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“…The variation in the fatigue resistance can be up to 35% for a 42CrMo4 steel [1] and 15% for stainless steel [2]. Certain forging simulation software is now capable of predicting the fibering orientation.…”

Section: Introductionmentioning

confidence: 99%

A new approach to model the fatigue anisotropy due to non-metallic inclusions in forged steels

Pessard¹,

Morel²,

Bellett³

et al. 2012

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The objective of this work is to propose an anisotropic fatigue criterion for the sizing of industrial forged components. The results from different experimental campaigns using three different rolled steels are first presented. The effect of inclusions and the microstructure on the fatigue behaviour are investigated. For the two ferrite-pearlitic steels tested, the presence of a microstructure consisting of elongated grains has no observable effects on the fatigue behaviour. For two of the three steels studied the presence of non-metallic inclusions, elongated in the rolling direction, form the origin of the anisotropic fatigue behaviour.The proposed probabilistic model is based on the competition between two possible fatigue crack initiation mechanisms. The anisotropic character of the fatigue resistance of forged components is taken into account by the definition of the geometry and the orientation of the non-metallic inclusion. This criterion results in the establishment of a probabilistic Kitagawa type diagram.

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Anisotropy effects on the fatigue behaviour of rolled duplex stainless steels

Cited by 49 publications

References 13 publications

Modelling the role of non-metallic inclusions on the anisotropic fatigue behaviour of forged steel

Modelling the role of non-metallic inclusions on the anisotropic fatigue behaviour of forged steel

Utilização Da Microscopia De Força Atômica No Estudo Da Fragilização a 475ºc Em Um Aço Inoxidável Lean Duplex

A new approach to model the fatigue anisotropy due to non-metallic inclusions in forged steels

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