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Title: Microstructures relevant to brittle fracture initiation at the heat-affected zone of weldment of a low carbon steel

Abstract

Charpy toughness of the heat-affected zone (HAZ) of weldment of a low carbon steel has been investigated by means of an instrumented Charpy test and fractographic analysis. Microstructures were varied with thermal cycles simulating double-pass welding. The ductile-brittle transition temperature is the most deteriorated at an intermediate second-cycle heating temperature. The origin of the difference in the transition temperatures has been analyzed to exist in the brittle fracture initiation stage. Fractographic examination correlating with microstructural features has revealed that the brittle fracture initiation site is associated with the intersection of bainitic ferrite areas with different orientations rather than the martensite-austenite constituents. The role of the constraint of plastic deformation on the brittle fracture initiation is discussed.

Authors:
; ; ;  [1]
  1. Waseda Univ., Tokyo (Japan). Dept. of Materials Science and Engineering
Publication Date:
OSTI Identifier:
382509
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 27; Journal Issue: 9; Other Information: PBD: Sep 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON STEELS; WELDED JOINTS; MICROSTRUCTURE; FRACTURE PROPERTIES; CHARPY TEST; FRACTOGRAPHY; THERMAL CYCLING; SIMULATION; DUCTILE-BRITTLE TRANSITIONS; BAINITE; FERRITE; ORIENTATION; CORRELATIONS; PLASTICITY; CRACKS; CRACK PROPAGATION

Citation Formats

Ohya, K, Kim, J, Yokoyama, K, and Nagumo, M. Microstructures relevant to brittle fracture initiation at the heat-affected zone of weldment of a low carbon steel. United States: N. p., 1996. Web. doi:10.1007/BF02652351.
Ohya, K, Kim, J, Yokoyama, K, & Nagumo, M. Microstructures relevant to brittle fracture initiation at the heat-affected zone of weldment of a low carbon steel. United States. https://doi.org/10.1007/BF02652351
Ohya, K, Kim, J, Yokoyama, K, and Nagumo, M. 1996. "Microstructures relevant to brittle fracture initiation at the heat-affected zone of weldment of a low carbon steel". United States. https://doi.org/10.1007/BF02652351.
@article{osti_382509,
title = {Microstructures relevant to brittle fracture initiation at the heat-affected zone of weldment of a low carbon steel},
author = {Ohya, K and Kim, J and Yokoyama, K and Nagumo, M},
abstractNote = {Charpy toughness of the heat-affected zone (HAZ) of weldment of a low carbon steel has been investigated by means of an instrumented Charpy test and fractographic analysis. Microstructures were varied with thermal cycles simulating double-pass welding. The ductile-brittle transition temperature is the most deteriorated at an intermediate second-cycle heating temperature. The origin of the difference in the transition temperatures has been analyzed to exist in the brittle fracture initiation stage. Fractographic examination correlating with microstructural features has revealed that the brittle fracture initiation site is associated with the intersection of bainitic ferrite areas with different orientations rather than the martensite-austenite constituents. The role of the constraint of plastic deformation on the brittle fracture initiation is discussed.},
doi = {10.1007/BF02652351},
url = {https://www.osti.gov/biblio/382509}, journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 9,
volume = 27,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 1996},
month = {Sun Sep 01 00:00:00 EDT 1996}
}