Strain accumulation during microstructurally small fatigue crack propagation in bcc Fe-Cr ferritic stainless steel

Research output: Contribution to journalArticleScientificpeer-review

Standard

Harvard

APA

Vancouver

Author

Bibtex - Download

@article{67ef7b3cd8874dc6a89e3cc8264407eb,
title = "Strain accumulation during microstructurally small fatigue crack propagation in bcc Fe-Cr ferritic stainless steel",
abstract = "Strain accumulation was studied by digital image correlation technique (DIC) during microstructurally small fatigue crack propagation in polycrystalline 18{\%}Cr ferritic stainless steel. Load-controlled fatigue testing was performed with R-ratio of 0.1 and frequency 10 Hz. The maximum applied stress was well below the yield stress of the studied material. The effect of the observed strain field on crack growth rate variation is discussed. Fracture surfaces were studied by scanning electron microscopy (SEM) evidencing the connection between the mechanism of the fatigue crack growth, accumulated strain and crack growth rate. Detailed study of fracture surface morphology was carried out by atomic force microscopy (AFM). Results indicate two processes of material damage accumulation and failure during cyclic loading: 1) local shear strain zones form successively ahead of the crack tip, and 2) fatigue crack growth occurs by both single- and multiple-slip mechanisms. The place and intensity of shear strain localization zones vary during the crack growth that is related closely to the local variation of crack growth rate.",
keywords = "bcc crystal structure, Digital image correlation, Microstructurally small fatigue crack, Shear strain localization",
author = "E. Malitckii and H. Remes and P. Lehto and Y. Yagodzinskyy and S. Bossuyt and H. H{\"a}nninen",
year = "2018",
month = "2",
day = "1",
doi = "10.1016/j.actamat.2017.10.038",
language = "English",
volume = "144",
pages = "51--59",
journal = "Acta Materialia",
issn = "1359-6454",

}

RIS - Download

TY - JOUR

T1 - Strain accumulation during microstructurally small fatigue crack propagation in bcc Fe-Cr ferritic stainless steel

AU - Malitckii, E.

AU - Remes, H.

AU - Lehto, P.

AU - Yagodzinskyy, Y.

AU - Bossuyt, S.

AU - Hänninen, H.

PY - 2018/2/1

Y1 - 2018/2/1

N2 - Strain accumulation was studied by digital image correlation technique (DIC) during microstructurally small fatigue crack propagation in polycrystalline 18%Cr ferritic stainless steel. Load-controlled fatigue testing was performed with R-ratio of 0.1 and frequency 10 Hz. The maximum applied stress was well below the yield stress of the studied material. The effect of the observed strain field on crack growth rate variation is discussed. Fracture surfaces were studied by scanning electron microscopy (SEM) evidencing the connection between the mechanism of the fatigue crack growth, accumulated strain and crack growth rate. Detailed study of fracture surface morphology was carried out by atomic force microscopy (AFM). Results indicate two processes of material damage accumulation and failure during cyclic loading: 1) local shear strain zones form successively ahead of the crack tip, and 2) fatigue crack growth occurs by both single- and multiple-slip mechanisms. The place and intensity of shear strain localization zones vary during the crack growth that is related closely to the local variation of crack growth rate.

AB - Strain accumulation was studied by digital image correlation technique (DIC) during microstructurally small fatigue crack propagation in polycrystalline 18%Cr ferritic stainless steel. Load-controlled fatigue testing was performed with R-ratio of 0.1 and frequency 10 Hz. The maximum applied stress was well below the yield stress of the studied material. The effect of the observed strain field on crack growth rate variation is discussed. Fracture surfaces were studied by scanning electron microscopy (SEM) evidencing the connection between the mechanism of the fatigue crack growth, accumulated strain and crack growth rate. Detailed study of fracture surface morphology was carried out by atomic force microscopy (AFM). Results indicate two processes of material damage accumulation and failure during cyclic loading: 1) local shear strain zones form successively ahead of the crack tip, and 2) fatigue crack growth occurs by both single- and multiple-slip mechanisms. The place and intensity of shear strain localization zones vary during the crack growth that is related closely to the local variation of crack growth rate.

KW - bcc crystal structure

KW - Digital image correlation

KW - Microstructurally small fatigue crack

KW - Shear strain localization

UR - http://www.scopus.com/inward/record.url?scp=85032264967&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2017.10.038

DO - 10.1016/j.actamat.2017.10.038

M3 - Article

VL - 144

SP - 51

EP - 59

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

ER -

ID: 16042448