Publication detail

Contradiction in Fracture- and Notch Toughness of High Purity Low Alloy Steels

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

Czech title

Rozpor mezi lomovou a vrubohou houževnatostívysoce čistých nízkolegovaných ocelí

English title

Contradiction in Fracture- and Notch Toughness of High Purity Low Alloy Steels

Type

conference paper

Language

en

Original abstract

Values of initial fracture toughness and impact notch toughness of high purity USSLA steel were determined for 6 different heat treatments leading to 3 different prior austenite grain sizes d. Fracture surfaces of specimens exhibited transgranular as well as intergranular morphology. Observed extreme contradiction in fracture- and notch toughness behavior can be explained in terms of intergranularly induced crack tip shielding working particularly during the fracture toughness test of coarse grained specimens. Inverse behaviour of specimens for impact tests is associated with low resistance of coarse grained structures against crack nucleation caused predominantly by pronounced carbide precipitation and long dislocation mean free paths. Quantitative assessment of the shielding effect by means of both the 3D grain boundary network model (Poisson-Voronoi tessellation) and the FRANC3D program (boundary element method) enables to obtain realistic values of surface energy related to corrected KIc values.

English abstract

Values of initial fracture toughness and impact notch toughness of high purity USSLA steel were determined for 6 different heat treatments leading to 3 different prior austenite grain sizes d. Fracture surfaces of specimens exhibited transgranular as well as intergranular morphology. Observed extreme contradiction in fracture- and notch toughness behavior can be explained in terms of intergranularly induced crack tip shielding working particularly during the fracture toughness test of coarse grained specimens. Inverse behaviour of specimens for impact tests is associated with low resistance of coarse grained structures against crack nucleation caused predominantly by pronounced carbide precipitation and long dislocation mean free paths. Quantitative assessment of the shielding effect by means of both the 3D grain boundary network model (Poisson-Voronoi tessellation) and the FRANC3D program (boundary element method) enables to obtain realistic values of surface energy related to corrected KIc values.

Keywords in English

fracture toughness, notch toughness, low alloy steel, austenite grain

RIV year

2001

Released

01.06.2001

Publisher

Inst. Nuclear Research

Location

Řež

ISBN

92-828-8323-X

Book

Cleaner Metal for Industrial Exploitation

Pages count

8

BIBTEX


@inproceedings{BUT2818,
  author="Jaroslav {Pokluda} and Bohumil {Vlach} and Pavel {Šandera} and Ladislav {Jurášek},
  title="Contradiction in Fracture- and Notch Toughness of High Purity Low Alloy Steels",
  booktitle="Cleaner Metal for Industrial Exploitation",
  year="2001",
  month="June",
  publisher="Inst. Nuclear Research",
  address="Řež",
  isbn="92-828-8323-X"
}