Fracture process of a low carbon low alloy steel relevant to Charpy toughness at ductile-brittle fracture transition region

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02664675· OSTI ID:6590889

Tani, T ^[1]; Nagumo, M ^[2]

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1. Kobe Steel Corp. (Japan)
2. Waseda Univ., Tokyo (Japan). Dept. of Materials Science and Engineering

The fracture process that determines the Charpy energy at the ductile-brittle transition region was investigated by means of the instrumented Charpy test and fractographic analysis with a low carbon low alloy steel subjected to different control-rolling conditions. The decomposition of a Charpy energy into the energies dissipated in the course of the notch-tip blunting, stable crack growth, and brittle crack propagation is unique irrespective of the testing temperatures and specimen series. Toughness level can be divided into four regions according to the predominating fracture process. The temperature dependence of toughness and effects of the anisotropy of a specimen originates in the brittle fracture initiation stage rather than the resistance against the notch-tip blunting or stable crack growth. From fractographic examination referring to the stress analysis, it is discussed that the brittle fracture initiation is controlled by the local deformation microstructures in the plastic zone together with the stress field ahead of the notch or the stable crack front.

• OSTI ID: 6590889
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 26:2; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
DUCTILE-BRITTLE TRANSITIONS
ENERGY LOSSES
FRACTURE MECHANICS
FRACTURE PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
LOSSES
LOW ALLOY STEELS
MECHANICAL PROPERTIES
MECHANICS
STEELS