Experimental evaluation and modeling of sulfur content and anisotropy of sulfide inclusions on fatigue behavior of steels

Cyril, Nisha S; Fatemi, Ali

doi:10.1016/j.ijfatigue.2008.04.001

Cited by 35 publications

(30 citation statements)

References 13 publications

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“…Lower Mn/S ratio *35 was found in fractured sample as compared to 44.44 in un-fractured samples. The effects of above chemical constituents on microstructure and properties have been already researched and cited in the literature [3,4]. The 42CrMo 4 steel found comparatively with lower %Cr and %Mo which might affect hardenability behavior and its response toward hardening.…”

Section: Chemical Compositionmentioning

confidence: 99%

Analysis of Slide Gate Mounting Bolt Failure in Steel Ladle Due to Fatigue

Palai

Sinha

Venugopalan

2014

J Fail. Anal. and Preven.

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The mounting bolt failed during slide gate operation of a steel ladle was investigated. Metallurgical analysis confirms the bolt as IS 1367 10.9 grade hightensile 42CrMo 4 steel. On comparative study with a good un-fractured sample, a striation of fine banded ferrite in pearlite matrix was revealed in failed bolt under optical microscopy. The bolts failed due to fatigue and crack initiated from the surface of machined bolt threads. Comparatively lower hardness, low UTS associated with lower %Cr and %Mo content found to aggravate premature failure of bolts during ladle operation. Microstructure of un-fractured sample found with tempered bainite phase. The fatigue failure of bolts occurred due to repetitive nature of shear force development during steel pouring through slide gate system. Preventive measures to reduce fatigue failure of the mounting bolts are proposed.

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Section: Chemical Compositionmentioning

confidence: 99%

Analysis of Slide Gate Mounting Bolt Failure in Steel Ladle Due to Fatigue

Palai

Sinha

Venugopalan

2014

J Fail. Anal. and Preven.

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“…02 02 , (9) If m 2 governs the scatter and the factor 02 th K  is the scale factor of the distribution of the crack propagation threshold, the probability of rupture on a plane is:…”

Section: Criterionmentioning

confidence: 99%

“…For cast alloys, micro shrinkage voids and porosity due to degassing control the fatigue behaviour [5][6][7]. For rolled or forged alloys, porosity is not an issue, however nonmetallic inclusion are the type of defect which is the most detrimental [8][9][10]. The term "matrix", which is more commonly used when referring to composite materials, is used here as a general term to describe the material that surrounds the defects.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Temmel et al [11] reported that the fatigue anisotropy is more pronounced in a standard sulphur steel (50CrMo4 (EN 10083-3) QS) with a dense manganese sulphide population than in a low sulphur steel (50CrMo4 LS). Cyril et al [12] performed fatigue tests using 42CrMo4 (EN 10083-1) steel, with two different hardness (40 and 50 HV) and different sulphide densities. He showed that the anisotropic factor increases with an increase in the inclusion population and with increasing hardness.…”

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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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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Experimental evaluation and modeling of sulfur content and anisotropy of sulfide inclusions on fatigue behavior of steels

Cited by 35 publications

References 13 publications

Analysis of Slide Gate Mounting Bolt Failure in Steel Ladle Due to Fatigue

Analysis of Slide Gate Mounting Bolt Failure in Steel Ladle Due to Fatigue

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

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

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