Application of full-surface view in situ thermography measurements during ultrasonic fatigue of cast steel G42CrMo4

Krewerth, Dominik; Lippmann, T.; Weidner, Anja; Biermann, Horst

doi:10.1016/j.ijfatigue.2015.07.013

Cited by 37 publications

(18 citation statements)

References 40 publications

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“…The ridges on fatigue fracture surfaces (also known as ‘wing‐like structures’), 8 formed along the crack propagation direction, can be observed preferentially in low and medium carbon steels with a tempered martensite structure 14,52–54 . For the case of 42CrMo4‐tempered steel, investigated in present work, ridges are noticeable not only within a fisheye 55 but even on fatigue cracks initiated from the surface 34 . Thus, it is fair to assume that the formation of ridges is related to the interaction of a developing fatigue crack with the martensitic structure.…”

Section: Discussionmentioning

confidence: 54%

“…In addition, plasma nitriding (1 hr at 420°C and 2 hr at 570°C) for the surface hardness of 650 HV0.1 was implemented to block surface crack initiation 33 . Detailed hardness and residual stress distribution along the cross section of a specimen can be found elsewhere 34 . The average martensitic block size, which is a key structural parameter of lath martensite, 35 was estimated to be 3.63 μm (Figure 1C).…”

Section: Methodsmentioning

confidence: 99%

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On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Seleznev

Weidner

Biermann

2020

Fatigue Fract Eng Mat Struct

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A detailed microscopic analysis of fracture surfaces of 42CrMo4-hardened steel after ultrasonic fatigue testing revealed globular and cylindrical particles located in ridges along the crack propagation direction. Observed particles could be easily taken for non-metallic inclusions; however, chemical analysis showed that they are of the same composition as the steel matrix. The formation of such round-shaped debris was found to be a result of cutting out the matrix fragments by 'en passant' cracks interaction and their subsequent fretting burnishing. Possible correlation of the parameters of ridges and debris with cyclic plastic zone width and martensite structure is discussed.42CrMo4 steel, en passant cracks, fretting, high cycle fatigue, ultrasonic fatigue testing (USFT)

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Section: Discussionmentioning

confidence: 54%

Section: Methodsmentioning

confidence: 99%

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Seleznev

Weidner

Biermann

2020

Fatigue Fract Eng Mat Struct

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“…Nevertheless, the morphology closely investigated by SEM is in excellent agreement with reports of endogenous inclusions that originate from aluminum killing during steelmaking [15][16][17]26,27] and component failure that was traced back to alumina inclusions. [3,28] 3.4. Steel Characterization 3.4.1.…”

Section: Deposited Clustermentioning

confidence: 99%

“…Especially fracture toughness, tensile strength, ductility, and fatigue of the products are affected, which may result in excessive casting repairs or rejected products. [1][2][3] Commonly, nonmetallic inclusions get trapped by a slag during steelmaking. Small inclusions are too light though to move toward the slag by buoyancy force.…”

Section: Introductionmentioning

confidence: 99%

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

et al. 2017

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Understanding interactions between filter and molten steel is essential to improve the purity of casted products by filtration. Characteristic, in situ formed layers on the surface of carbon-bonded alumina filters result from these interactions. To comprehend their formation, this study illustrates the time dependency of the layer buildup. Therefore, reactions at the filter/steel interface under quasi static conditions are examined using spark plasma sintering (SPS) equipment. Immersion tests in a steel casting simulator, which provides close-to-reality conditions, complement these investigations. Microstructure and phase analyses reveal that interfacial reactions between filter and steel lead to a thin in situ formed layer on the filter surface. During a "reactive" stage, large polycrystalline alumina structures are formed. Thereby, material is transported both from the carbon-bonded material underneath (i.e., gaseous reaction products) and from the molten steel (i.e., precipitating particles and endogenous inclusions) to the filter/steel interface. The formation of these alumina particles comes to an end as soon as the carbon supply, which triggers the dissolution and precipitation processes at the interface, is cut-off. From that point on, endogenous inclusions are deposited on them ("active" stage). The filters were most efficient during the reactive stage, that is, as long as the interfacial reactions take place.

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“…In addition, the gauge length of the specimens were cooled with a spot cooling system. [29] Details of the specimen geometry can be found in a previous paper. [29] All test were performed under symmetrical push-pull loading conditions (R ¼ À1) at ambient air and room temperature.…”

Section: Fatigue Testsmentioning

confidence: 99%

Effect of Crucible Material for Ingot Casting on Detrimental Non‐Metallic Inclusions and the Resulting Mechanical Properties of 18CrNiMo7‐6 Steel

et al. 2017

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The steel 18CrNiMo7-6 (AISI 4317) is treated in three different crucibles based on carbon-bonded alumina. Non-metallic inclusions in the steel are characterized by means of optical microscopy and scanning electron microscopy. Strength, ductility, and dynamic fracture toughness of the steel are evaluated at different temperatures. Furthermore, fatigue lifetimes in the very high cycle regime are determined. The treatment in a carbon-bonded alumina (A-C) crucible resulted in a relatively high inclusion content involving a high number of duplex inclusions consisting of MnS and Si-Al-O. In contrast, less but large pure MnS inclusions are observed when the steel is treated in carbon-bonded alumina-zirconia-titania crucibleswith or without a coating of carbon nanotubes (AZT-C-n and AZT-C). The steel treated in the A-C crucible exhibits the highest strength and fatigue lifetime, but the lowest energy dissipation. The relatively low inclusion content in the AZT-C treated steel results in high energy dissipation during tensile deformation. However, large MnS inclusions in the AZT-C and AZT-C-n treated steels act as crack initiation sites and reduce the fatigue lifetime. The dynamic fracture toughness is not affected by the different melt treatments. This result is explained by cell-like structures within the material that are characterized by a lower strength and an increased concentration of MnS inclusions.

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Application of full-surface view in situ thermography measurements during ultrasonic fatigue of cast steel G42CrMo4

Cited by 37 publications

References 40 publications

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

On the formation of ridges and burnished debris along internal fatigue crack propagation in 42CrMo4 steel

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

Effect of Crucible Material for Ingot Casting on Detrimental Non‐Metallic Inclusions and the Resulting Mechanical Properties of 18CrNiMo7‐6 Steel

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