Publication detail

Microstructure-aided Analysis of Fatigue Thresholds in Duplex Stainless Steel

POKLUDA, J. PODRÁBSKÝ, T. SLÁMEČKA, K. POSPÍŠILOVÁ, S. CHAI, G.

Czech title

Mikrostrukturní analýza únavových prahových hodnot v duplexní nerezové oceli

English title

Microstructure-aided Analysis of Fatigue Thresholds in Duplex Stainless Steel

Type

journal article in Web of Science

Language

en

Original abstract

High fatigue threshold values of duplex ferritic-martensitic steels are interpreted by using a unified model of roughness- and plasticity induced crack closure. Complex metallographical and fractographical analysis was performed in order to obtain characteristics of tortuous crack paths produced by crack deflection and branching mainly at austenite/ferrite interfaces. Calculated values of effective thresholds are in a good agreement with experimental data. The total level of extrinsic toughening (closure + shielding) induced by the duplex microstructure was determined to be as much as 70% of measured fatigue threshold values. This is the main reason for the high resistance to propagation of long fatigue cracks in the near-threshold region.

Czech abstract

Únavové prahové hodnoty duplexní feriticko-martensitické oceli jsou interpretovány užitím zobecněného modelu drsnostně a plasticky indukovaného zavírání trhliny. Komplexní metalografická a fraktografická analýza byla užita k získání charakteristik křivolaké trhliny přednostně na rozhraní austenit/ferit. Spočtené hodnoty efektivních prahových hodnot jsou v dobré shodě s experimentálními daty. Celková úroveň extrinsitního zhouževnatění indukovaného duplexní mikrostrukturou byla určena jako 70% měřených prahových hodnot.

English abstract

High fatigue threshold values of duplex ferritic-martensitic steels are interpreted by using a unified model of roughness- and plasticity induced crack closure. Complex metallographical and fractographical analysis was performed in order to obtain characteristics of tortuous crack paths produced by crack deflection and branching mainly at austenite/ferrite interfaces. Calculated values of effective thresholds are in a good agreement with experimental data. The total level of extrinsic toughening (closure + shielding) induced by the duplex microstructure was determined to be as much as 70% of measured fatigue threshold values. This is the main reason for the high resistance to propagation of long fatigue cracks in the near-threshold region.

Keywords in Czech

Prahové únavové hodnoty, duplexní ocel, vyhnutí trhliny, větvení trhliny, extrinsitní zhouževnatění, zobecněný model zavírání trhliny

Keywords in English

Fatigue thresholds, duplex steel, crack deflection, crack branching, extrinsic toughening, unified closure model

RIV year

2008

Released

23.01.2008

ISSN

0255-5476

Journal

Materials Science Forum

Volume

567-568

Number

1

Pages from–to

101–104

Pages count

4

BIBTEX


@article{BUT45344,
  author="Jaroslav {Pokluda} and Tomáš {Podrábský} and Karel {Slámečka} and Simona {Hutařová} and Guocai {Chai},
  title="Microstructure-aided Analysis of Fatigue Thresholds in Duplex Stainless Steel",
  journal="Materials Science Forum",
  year="2008",
  volume="567-568",
  number="1",
  month="January",
  pages="101--104",
  issn="0255-5476"
}