Study of fatigue processes occurring in the plastic zone in front of the tip of a microcrack in austenitic steels (I)

Eterashvili, Tamaz

doi:10.1134/s0031918x06020128

Cited by 1 publication

(2 citation statements)

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“…Calculations of R for the steel with E = 195,000 MPa and σ F = 280 MPa showed that for this steel R ≅110 d, that is, it is equal to 300-350 μm that coincides with our experimental measurements (r ≅ 0.1 R) [6].…”

Section: Austenitic Stainless Steels -New Aspectssupporting

confidence: 87%

“…The microcracks are crystallographically shaped and are nucleated along the slip bands and on grain boundaries, under the favorable circumstances. They are found at a distance of 250-300 μm from the tip of macrocrack [6]. This fact, once again, indicates that they are of deformation origin and are in close relations with the structural transformations happening in the steel.…”

Section: Discussionmentioning

confidence: 59%

See 1 more Smart Citation

Study of Fracture Mechanisms at Cyclic Fatigue of Austenitic Steels Used in Nuclear Reactors

Eterashvili¹

2017

Austenitic Stainless Steels - New Aspects

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The presented work deals with the possible reasons of nucleation and propagation of macro-, meso-, and microcracks after low-cycle fatigue (LCF) tests of stainless, austenitic steels at room temperature. This research will also support the solution of some important problems of steel modeling and their application to EURATOM, FUSION, TACIS, PHARE, CORDIS, PERFECT, AMES, FP 7, and GEN IV programs. The scanning electron microscopic (SEM), X-ray, and transmission electron microscopic (TEM) examinations and statistical analysis of the samples which undergone the low-cycle fatigue (LCF) showed that the average length of slip bands and micro-components of macrocrack are equal, and they are always parallel to each other, indicating their crystallographic character. The microcracks in these samples, caused by the residual stresses after the LCF, were studied in the TEM samples after their preparation to reveal the features of microcrack initiation and nucleation. It was shown that microcracks propagate along slip bands and change their propagation direction at the boundaries of grains and subgrains. This confirms that microcracks, as well as micro-components of mesocrack, are crystallographic. Mathematical calculations of elastic-plastic model are also performed which showed that the length of plastic zone, according to our assessments, is equal to 110-120 d, where d is a width of crack opening.

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Section: Austenitic Stainless Steels -New Aspectssupporting

confidence: 87%

Section: Discussionmentioning

confidence: 59%