The behavior of short fatigue cracks during Very High Cycle (VHCF) Fatigue of duplex stainless steel

Krupp, Ulrich; Giertler, Alexander; Söker, M.; Fu, Hongwang; Dönges, Benjamin; Christ, Hans‐Jürgen; Hüsecken, A.K.; Pietsch, U.; Fritzen, Claus‐Peter; Ludwig, Wolfgang

doi:10.1016/j.engfracmech.2015.03.024

Cited by 30 publications

(11 citation statements)

References 22 publications

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“…In literature, the influence of the grain boundaries on total energy dissipation in the material is well known . Moreover, in this paper, the experimental analysis on temperature variations confirms that an amount of the supplied total mechanical energy is not completely transformed into heat but remains stored in the material.…”

Section: Discussion Of the Correlation Between Temperature Variationssupporting

confidence: 68%

“…In a biphasic material, the matrix discontinuities could represent stress concentration zones influencing the strength of the material; in fact for ASTM A 890, the overall behaviour of material depends on the differences in strength and ductility of both phases that are, in turn, influenced by grain size/geometry/orientation . This effect is more predominant in a biphasic steel than in a monophasic one.…”

Section: Discussion Of the Correlation Between Temperature Variationsmentioning

confidence: 99%

“…All these factors can affect the temperature evolution of the material because the overall behaviour of material depends on the differences in strength and ductility for both phases, which are, in turn, influenced by grain size/geometry/orientation. [27][28][29] Results show a better accuracy of fatigue limit estimation provided by the proposed 3 indexes. Of course, the evaluation of such indexes can also be performed even in those cases where the temperature plateau is achieved.…”

Section: Introductionmentioning

confidence: 88%

“…The texture of the material is composed by lattice mismatch, lattice discontinuities (grain interfaces, distribution of grain orientation, and interstitial/substitutional atoms in the matrix), and different grain shapes (“equiassic” or “columnar/elongated”). All these factors can affect the temperature evolution of the material because the overall behaviour of material depends on the differences in strength and ductility for both phases, which are, in turn, influenced by grain size/geometry/orientation …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Finis

Palumbo

Silva

et al. 2017

Fatigue Fract Eng Mat Struct

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A critical aspect of standard test methods for fatigue characterization is that they do not provide any information on heat dissipation in the material and involve very expensive experimental campaigns in time and costs. In recent years, thermographic methods capable of reducing testing time have been developed, also providing more information on damage occurring in the material. A commonly used approach is based on the assessment of the temperature plateau during a stepwise loading procedure. At times, however, this approach can fail if temperature stabilization is not achieved. In this regard, in this paper, a new approach based on the assessment of 3 different thermal indexes was proposed to estimate the fatigue limit of 3 stainless steels: AISI 316, 17‐4PH, and ASTMA890 grade 4a, respectively, exhibiting fully austenitic, fully martensitic, and duplex biphasic microstructure. The fatigue tests were carried out by using a stepwise loading procedure, under loading ratio of 0.5. The analysis demonstrated the possibility to further reduce testing time and, consequently, the fatigue experimental campaign. Moreover, some ideas are discussed about how to justify the different thermal behaviour of a biphasic stainless steel, in total temperature variation. Moreover, a discussion of results regarding the various thermal behaviours of the investigated steels and a possible correlation with the microstructure has been proposed.

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Section: Discussion Of the Correlation Between Temperature Variationssupporting

confidence: 68%

Section: Discussion Of the Correlation Between Temperature Variationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Finis

Palumbo

Silva

et al. 2017

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…The fatigue lifetime of cyclically loaded components can be attributed up to 90% to the initiation and growth of small fatigue cracks. 1 The behaviour of these cracks is largely influenced by their interaction with microstructural obstacles, like grain [2][3][4] or phase 5 boundaries. A systematic investigation of microstructurally short fatigue cracks is unfortunately not easily possible, as methods used to measure the crack behaviour in macroscopic specimens are mostly insensitive to fatigue cracks with sizes of only a few micrometres.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth in micro specimens as a tool to measure crack–microstructure interactions

Grünewald

Rauber

Marx

et al. 2020

Fatigue Fract Eng Mat Struct

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The process of short fatigue crack growth plays a significant role for the lifetime of materials in the high and very high cycle regimes. Fatigue crack growth is strongly influenced by interactions with microstructural obstacles, such as grain boundaries or phase boundaries, requiring a better understanding of these interactions to enhance the lifetime in these load regimes and improve lifetime calculations. Although it is possible to obtain crack growth rates from fatigue cracks in the lower micrometre range, further information like the exact position and type of the obstacle are mostly unavailable during the experiment. To overcome this issue, we propose a testing methodology of fatigue crack growth in micro specimens, which allows for an exact positioning of the crack relative to the obstacles and for monitoring the crack behaviour in a scanning electron microscope. The capabilities of this method are demonstrated for the interaction of fatigue cracks with grain boundaries.

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Influence of Ce Addition on Microstructure and Corrosion Resistance of 2101 Duplex Stainless Steel

Gong

Zhang

et al. 2021

steel research int.

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2101 duplex stainless steel with low Ni content is developed to replace austenitic stainless steel in many corrosive environments. Herein, the effects of Ce addition on the microstructure and corrosion resistance of 2101 duplex stainless steel are studied. The electrochemical corrosion behavior of 2101 duplex stainless steel with Ce contents of 0, 0.005, and 0.020 wt% is studied in 3.5 wt% NaCl solution and 0.05 mol L−1 H2SO4 + 0.05 mol L−1 KSCN solution at 25 °C. The situation is evaluated in 6 wt% FeCl3 solution at 35 °C. The results show that with increasing Ce content, the proportion of α phase in 2101 duplex stainless steel decreases, whereas the proportion of γ phase increases. At 0.005 wt% Ce, the two‐phase ratio is close to 1:1. Moreover, the partition coefficient (K) of elements gradually approaches 1 with increasing Ce, indicating a more uniform element distribution between the two phases. The electrochemical experiments in simulated seawater and acidic environments show that Ce addition gradually increases the corrosion potential and pitting resistance, leading to the formation of more stable passivation film.

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The behavior of short fatigue cracks during Very High Cycle (VHCF) Fatigue of duplex stainless steel

Cited by 30 publications

References 22 publications

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Is the temperature plateau of a self‐heating test a robust parameter to investigate the fatigue limit of steels with thermography?

Fatigue crack growth in micro specimens as a tool to measure crack–microstructure interactions

Influence of Ce Addition on Microstructure and Corrosion Resistance of 2101 Duplex Stainless Steel

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