Publication detail
Antagonism in Fracture and Notch Toughness of UHSLA Steels
POKLUDA, J. VLACH, B. ŠANDERA, P. JURÁŠEK, L.
Czech title
Rozpor mezi lomovou a vrubovou houževnatostí UHSLA ocelí
English title
Antagonism in Fracture and Notch Toughness of UHSLA Steels
Type
conference paper
Language
en
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 in English
fracture toughness, impact absorbed energy, ultra-high strength low alloy steel, shielding effect
RIV year
2001
Released
01.01.2001
Publisher
SF2M Les Fontelles
Location
Les Fontelles
Book
Charpy Centenary Conference 2001
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",
month="January",
publisher="SF2M Les Fontelles",
address="Les Fontelles"
}