Publication result detail

Antagonism in Fracture and Notch Toughness of UHSLA Steels

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

Original Title

Antagonism in Fracture and Notch Toughness of UHSLA Steels

English Title

Antagonism in Fracture and Notch Toughness of UHSLA Steels

Type

Paper in proceedings (conference paper)

Original Abstract

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.

English abstract

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.

Keywords

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

Key words in English

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

Authors

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

Released

01.01.2001

Publisher

SF2M Les Fontelles

Location

Les Fontelles

Book

Charpy Centenary Conference 2001

Pages from

465

Pages count

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",
  pages="8",
  publisher="SF2M Les Fontelles",
  address="Les Fontelles"
}