METALLURGICAL FACTORS CONTROLLING THE FRACTURE TOUGHNESS OF WELD MICROSTRUCTURES, WITH PARTICULAR REFERENCE TO THE MICROMECHANISM OF FRACTURE INITIATION

To link fracture toughness measurements specifically to particular micromechanisms, correlations between toughness, microstructure and composition must be related directly to the mechanism of initiation by inspection of the fracture surface in the region of the specimen notch after testing. Some factors which are beneficial to resistance to cleavage may be deleterious as regards resistance to microvoid coalescence and that, for optimum toughness over a wide range of temperature, applied strain rate and stress state, compromises in composition are required. However where, in a given application, only one micromechanism of fracture is of concern, efforts can be more simply concentrated on optimizing composition and welding procedure to produce HAZ and weld metal microstructures having the maximum resistance to fracture by this particular mechanism, subject, of course, to any other requirements, such as retaining adequate tensile properties and resistance to weld cracking problems.

  • Supplemental Notes:
    • Presented at Practical Implications of Fracture Mechanics, Spring Meeting, University of Newcastle Upon Tyne, England, March 27-29, 1973.
  • Corporate Authors:

    Institute of Metallurgy

    London,   England 
  • Authors:
    • Dolby, R E
    • Saunders, G G
    • Widgery, D J
  • Publication Date: 1973

Media Info

  • Features: References;

Subject/Index Terms

Filing Info

  • Accession Number: 00072791
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Ser2,No.10,604-73-Y Conf Paper
  • Files: TRIS
  • Created Date: Jan 16 1976 12:00AM