Fatigue threshold studies in Fe, Fe-Si, and HSLA steel: Part II. thermally activated behavior of the effective stress intensity at threshold

Yu, W.; Esaklul, Khlefa A.; Gerberich, William W.

doi:10.1007/bf02644563

Cited by 41 publications

(14 citation statements)

References 16 publications

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“…For example, compressive residual stress in the crack wake has been proposed to be responsible for the enhanced FCP resistance of some austenitic stainless steels at cryogenic temperatures as a result of deformationinduced phase transformation [30]. Other mechanisms include a diminished environmental effect [31], a reduced oxideinduced crack closure contribution [31,32], a change in failure mechanism from ductile to brittle manner [33] and an increase in stress to activate dislocation source located near the crack tip [32] at cryogenic temperatures. Among the proposed mechanisms, the previous studies on the FCP behavior of highMn steel at 110 K suggested that the mechanism associated with a dislocation dynamics model is predominant for the enhanced resistance to FCP at low temperatures [33].…”

Section: Introductionmentioning

confidence: 99%

“…The K th value, for example, was 15.2, 17.1 and 18.5 MPa√m for the Fe24Mn specimens in the region of BM, WM and FL, respectively, at 110 K. Previously, several possible mechanisms for the improvement in FCP behavior of Fe24Mn BM specimen with decreasing temperature were assessed by the authors [5]. The mechanisms include the diminished environmental effect [15], the reduced oxide-induced crack closure contribution [13,42], the change in failure mechanism from ductile to brittle manner [40] and the increase in stress to activate dislocation source located near the crack tip [32] at cryogenic temperatures. Among them, the mechanism associated with a thermal stress for activating dislocation source was proposed for the low temperature improvement in FCP resistance of high-Mn austenitic steels [5].…”

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Fatigue crack propagation behavior of Fe24Mn steel weld at 298 and 110 K

et al. 2015

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The fatigue crack propagation (FCP) tests were conducted on Fe24Mn steel in the region of base metal (BM), weld metal (WM) and fusion line (FL) at 298 and 110 K. The FCP rates of Fe24Mn specimens in the region of BM, WM and FL were greatly decreased, while no notable difference in the fracture mode was observed, with decreasing temperature from 298 to 110 K. The FCP rates of Fe24Mn WM and FL specimens were slightly lower than those of BM specimen at both room and cryogenic temperatures. The SEM fractographic analyses suggested that each specimen showed the transgranular facets at both temperatures in low and intermediate K regimes. However, the morphological details varied depending on the region of weld and testing temperature. Relatively large sized facets were observed for the WM specimen with the columnar grain boundary playing the same role as the grain boundary in the BM and the FL specimens in the near-threshold K regime. The FCP behavior of Fe24Mn steel in the region of BM, WM and FL is discussed at 298 and 110 K based on the fractographic and micrographic observation.

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Section: Introductionmentioning

confidence: 99%

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Fatigue crack propagation behavior of Fe24Mn steel weld at 298 and 110 K

et al. 2015

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“…Due to the promising low temperature tensile properties and fracture toughness, high-Mn steels have been developed for cryogenic Materials Characterization 103 (2015) [28][29][30][31][32][33][34][35][36] ⁎ Corresponding author. E-mail address: sang@gnu.ac.kr (S. Kim).…”

Section: Introductionmentioning

confidence: 99%

Comparative studies on near-threshold fatigue crack propagation behavior of high manganese steels at room and cryogenic temperatures

Jeong

Lee

Yoo

et al. 2015

Materials Characterization

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“…This type of behavior has been observed by many researchers in various materials and generally the temperature decrease has a beneficial effect on the resistance to the FCG. [5][6][7][8][9][10][11][12][13][14] However, the experimentally measured data in the cited works show a significantly different temperature effect on the crack growth rates. The investigators of the influence of temperature decrease from room temperature to cryogenic temperatures revealed both little significant influence 5,11,12) and 80-fold decrease of the FCG in steels and other materials also.…”

Section: Introductionmentioning

confidence: 99%

“…The investigators of the influence of temperature decrease from room temperature to cryogenic temperatures revealed both little significant influence 5,11,12) and 80-fold decrease of the FCG in steels and other materials also. 6,7,13) The problem of the microstructural influence at cryogenic temperatures on FCG behaviour is equally unsolved. 14) The aim of the present paper is to determine the FCG at 295 K and 77 K in steels with remarkable differences in grain size and, if possible, to show a functional relation between cryogenic fatigue and tensile properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on the Fatigue Crack Growth in Steels at Temperatures 295 and 77 K

Rosenberg

2003

ISIJ International

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Experiments were conducted on the same materials, which were used in the previous study, 15) where fatigue strength in smooth and notched specimens, and the growth of so-called short fatigue cracks were investigated. In this work are minutely presented only the results conducted on a commercially produced low-carbon steel (marked steel 1) and two HSLA steels (steel 2 and 3). The steels marked 1a and 1b exhibited coarse-grain microstructures produced by heat treating of steel 1.Single edge notch, three point bend specimens machined perpendicularly and parallelly to the rolling direction had a ISIJ International, Vol. 43 (2003) Fatigue crack growth (FCG) and threshold stress intensity in low carbon and HSLA steels with remarkably different ferrite grain sizes (d f ) at room temperature and temperature of liquid nitrogen were investigated. The FCG rates were found to decrease with decreasing temperature for all investigated microstructural states and the influence of temperature decrease was the most significant in coarse grain microstructures. The threshold values of the stress intensity factor, (DK th ), below which cracks do not propagate, decreased by between 29.1 % (d f ϭ2.7 mm) and 49.3 % (d f ϭ88.4 mm) when specimens were tested at the cryogenic temperature.A general relationship between the FCG rate, the effects of grain boundary blocking on the plastic zone size and/or the crack-tip opening displacement and the effect of changing temperature, is discussed. Furthermore, the concept of a functional relation between tensile and fatigue data at cryogenic temperatures was also investigated. It was shown that the ratio of DK th at 77 K to DK th at 295 K is proportional to the second root of the ratio of the tensile strength values at these temperatures i.e. DK th 77 K /DK th 295K £ (s u 77 K /s u 295 K ) 1/2 .

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Fatigue threshold studies in Fe, Fe-Si, and HSLA steel: Part II. thermally activated behavior of the effective stress intensity at threshold

Cited by 41 publications

References 16 publications

Fatigue crack propagation behavior of Fe24Mn steel weld at 298 and 110 K

Fatigue crack propagation behavior of Fe24Mn steel weld at 298 and 110 K

Comparative studies on near-threshold fatigue crack propagation behavior of high manganese steels at room and cryogenic temperatures

Effect of Grain Size on the Fatigue Crack Growth in Steels at Temperatures 295 and 77 K

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