Detail publikace

Rozpor mezi lomovou a vrubovou houževnatostí UHSLA ocelí

POKLUDA, J. VLACH, B. ŠANDERA, P. JURÁŠEK, L.

Český název

Rozpor mezi lomovou a vrubovou houževnatostí UHSLA ocelí

Anglický název

Antagonism in Fracture and Notch Toughness of UHSLA Steels

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

en

Originální abstrakt

Values of initial fracture toughness KIc and impact absorbed energy of ultra-high strength low alloy steel were determined for 6 different heat treatments leading to 3 different mean prior austenite grain sizes dm. Fracture surfaces of all specimens, except of the standard one, exhibited intergranular morphology. The fracture toughness values increased with increasing dm whereas the absorbed energy decreased. The increase in KIc values is explained in terms of the crack driving force reduction caused by the intergranularly induced crack tip shielding. The inverse behavior of impact test specimens is associated with a low resistance of coarse grained structures against crack nucleation. Separation of the extrinsic shielding effect from the measured KIc values by using a 3D model of the intergranular crack front resulted in a comparable intrinsic fracture toughness of all investigated steel grades.

Anglický abstrakt

Values of initial fracture toughness KIc and impact absorbed energy of ultra-high strength low alloy steel were determined for 6 different heat treatments leading to 3 different mean prior austenite grain sizes dm. Fracture surfaces of all specimens, except of the standard one, exhibited intergranular morphology. The fracture toughness values increased with increasing dm whereas the absorbed energy decreased. The increase in KIc values is explained in terms of the crack driving force reduction caused by the intergranularly induced crack tip shielding. The inverse behavior of impact test specimens is associated with a low resistance of coarse grained structures against crack nucleation. Separation of the extrinsic shielding effect from the measured KIc values by using a 3D model of the intergranular crack front resulted in a comparable intrinsic fracture toughness of all investigated steel grades.

Klíčová slova anglicky

fracture toughness, impact absorbed energy, ultra-high strength low alloy steel, shielding effect

Rok RIV

2001

Vydáno

01.01.2001

Nakladatel

SF2M Les Fontelles

Místo

Les Fontelles

Kniha

Charpy Centenary Conference 2001

Počet stran

8

BIBTEX


@inproceedings{BUT3655,
  author="Jaroslav {Pokluda} and Bohumil {Vlach} and Pavel {Šandera} and Ladislav {Jurášek},
  title="Antagonism in Fracture and Notch Toughness of UHSLA Steels",
  booktitle="Charpy Centenary Conference 2001",
  year="2001",
  month="January",
  publisher="SF2M Les Fontelles",
  address="Les Fontelles"
}