Investigations of fatigue damage in tempered martensitic steel in the HCF regime

Koschella, Kevin; Krupp, Ulrich

doi:10.1016/j.ijfatigue.2019.02.050

Cited by 36 publications

(31 citation statements)

References 33 publications

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“…The average PAG size was calculated with the line intersection method to approximately 12 μm. This result correlates well with the data from Koschella and Krupp [30].…”

Section: Materials and Experimental Investigationssupporting

confidence: 92%

Micromechanical Modelling of the Influence of Strain Ratio on Fatigue Crack Initiation in a Martensitic Steel-A Comparison of Different Fatigue Indicator Parameters

et al. 2019

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Micromechanical fatigue lifetime predictions, in particular for the high cycle fatigue regime, require an appropriate modelling of mean stress effects in order to account for lifetime reducing positive mean stresses. Focus of this micromechanical study is the comparison of three selected fatigue indicator parameters (FIPs), with respect to their applicability to different total strain ratios. In this work, investigations are performed on the modelling and prediction of the fatigue crack initiation life of the martensitic high-strength steel SAE 4150 for two different total strain ratios. First, multiple martensitic statistical volume elements (SVEs) are generated by multiscale Voronoi tessellations. Micromechanical fatigue simulations are then performed on these SVEs by means of a crystal plasticity model to obtain microstructure dependent fatigue responses. In order to account for the material specific fatigue damage zone, a non-local homogenisation scheme for the FIPs is introduced for lath martensitic microstructures. The numerical results of the different non-local FIPs are compared with experimental fatigue crack initiation results for two different total strain ratios. It is concluded that the multiaxial fatigue criteria proposed by Fatemi-Socie is superior for predicting fatigue crack initiation life to the energy dissipation criteria and the accumulated plastic slip criteria for the investigated total strain ratios.

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“…The average PAG size was calculated with the line intersection method to approximately 12 μm. This result correlates well with the data from Koschella and Krupp [30].…”

Section: Materials and Experimental Investigationssupporting

confidence: 92%

Micromechanical Modelling of the Influence of Strain Ratio on Fatigue Crack Initiation in a Martensitic Steel-A Comparison of Different Fatigue Indicator Parameters

et al. 2019

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“…Usually as for simple microstructure materials (single phased as copper, 316L austenitic stainless steel), the barrier arresting the short crack advance is the grain boundary. For complex microstructure materials as martensitic steels, the barriers and the crack paths are of different nature according to the loading conditions such as stress values [20]. For martensitic steels, Koschelle et al [20] have shown that prior austenitic grain boundaries and block boundaries appears as barriers for short crack propagation in the high cycle fatigue and very high cycle regimes.…”

Section: Discussionmentioning

confidence: 99%

“…For complex microstructure materials as martensitic steels, the barriers and the crack paths are of different nature according to the loading conditions such as stress values [20]. For martensitic steels, Koschelle et al [20] have shown that prior austenitic grain boundaries and block boundaries appears as barriers for short crack propagation in the high cycle fatigue and very high cycle regimes. It is therefore reasonable to consider that the very first short cracks with a dimension of a grain or block size are hindered by the presence of boundaries which can be overcome after a given number of cycles.…”

Section: Discussionmentioning

confidence: 99%

Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel

Vogt

Bouquerel

Carle

et al. 2020

International Journal of Fatigue

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The low cycle fatigue behaviour of a 9Cr1MoNbV martensitic steel has been investigated at 350°C in air and in lead-bismuth eutectic (LBE) with low and high oxygen content. Total strain controlled tests were performed from t = 0.40% to 1.2%. The material exhibited a pronounced cyclic softening in both environments. LBE reduced the fatigue resistance. LBE accelerated the formation of the long crack by promoting the growth of the first short cracks. A clear change in propagation mode was observed. In air, ductile fatigue striations were observed while in LBE a brittle fracture decorated by voluminous and largely spaced striations were visible. From EBSD analysis, it was concluded that in LBE, the long crack advanced quickly by repeated and discontinuous cleavage.

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“…Several planar slip bands formed due to localized plastic deformation during the process of fatigue. The crystallographic fracture occurs along the slip plane oriented at some preferred location (Ref 20,21). Therefore, cleavage feature is found at the early stage of propagation.…”

Section: Fracture Morphology Analysismentioning

confidence: 99%

Comparative Research on Fatigue Performance of High-Strength Bainitic Steel with or without Corrosion

Zhao

Zhang

Chen

2020

J. of Materi Eng and Perform

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High-strength bainitic steels have acquired a promising place among steels due to their wide applications in engineering structures. It is, therefore, worthwhile to investigate their fatigue performance in different environments. When fatigue is atmospheric, lattice strength of weaker zones including granular bainite, phase boundary and MA constituents determines the nucleation life of fatigue. The deflected microstructural short cracks enhance the early propagation life of fatigue. In lath bainite, fine ferrite laths, highdensity dislocations within the grains, small grain size and high proportion of HAGBs inhibit the crack growth process to improve propagation life of fatigue. The fracture reveals transgranular mode for propagation of fatigue. The pre-corrosion strategy is adopted before investigating corrosion fatigue process, so that there is an adequate corrosion effect on samples. The pre-corrosion time is determined to be 3 days through the analysis of electrochemical parameters, viz. corrosion potential and current. For overall fatigue life, corrosion grooves have significant deterioration effect. The transgranular and intergranular features are observed in fracture at initial stage of crack growth. Only transgranular features are found at middle and final stages.

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Investigations of fatigue damage in tempered martensitic steel in the HCF regime

Cited by 36 publications

References 33 publications

Micromechanical Modelling of the Influence of Strain Ratio on Fatigue Crack Initiation in a Martensitic Steel-A Comparison of Different Fatigue Indicator Parameters

Micromechanical Modelling of the Influence of Strain Ratio on Fatigue Crack Initiation in a Martensitic Steel-A Comparison of Different Fatigue Indicator Parameters

Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel

Comparative Research on Fatigue Performance of High-Strength Bainitic Steel with or without Corrosion

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Investigations of fatigue damage in tempered martensitic steel in the HCF regime

Cited by 36 publications

References 33 publications

Micromechanical Modelling of the Influence of Strain Ratio on Fatigue Crack Initiation in a Martensitic Steel-A Comparison of Different Fatigue Indicator Parameters

Micromechanical Modelling of the Influence of Strain Ratio on Fatigue Crack Initiation in a Martensitic Steel-A Comparison of Different Fatigue Indicator Parameters

Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel

Comparative Research on Fatigue Performance of High-Strength Bainitic Steel with or without Corrosion

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Product

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Stability of fatigue cracks at 350 °C in air and in liquid metal in T91 martensitic steel