FRACTURE TOUGHNESS STUDY OF A GRADE 300 MARAGING STEEL WELD JOINT

The plane strain fracture toughness (K sub Ic) of a gas tungsten-arc (GTA) welded joint prepared from 10 mm ().39 in.) thick, grade 300, maraging steel was determined. All critical K sub I values less than about 270 kp mm to the -3/2 (76 ksi in. to the 1/2) satisfied ASTM validity criteria for K sub Ic; these included determinations for all microstructures except one that was characterized by a very high stable austenite content. The effect of microstructural and property variations characteristic of the HAZ (Heat Affected Zone) on the determination of K sub Ic was studied using "weld simulation" specimens thermally treated in a Smit weld simulator. Results were correlated with those obtained from actual welds on the basis of equivalent microstructures, mechanical properties, and thermal treatments. From this study, a tendency towards embrittlement due to short time exposure at 750 C was detected. It was also noted that K sub Ic appeared to be independent of grain size.

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  • Corporate Authors:

    American Welding Society

    345 East 47th Street
    New York, NY  USA  10017
  • Authors:
    • Blauel, J G
    • Smith, H R
    • Schulze, G
  • Publication Date: 1974-5

Media Info

  • Features: References;
  • Pagination: p. 211-218
  • Serial:
    • Welding Journal
    • Volume: 53
    • Issue Number: 5
    • Publisher: American Welding Society
    • ISSN: 0043-2296

Subject/Index Terms

Filing Info

  • Accession Number: 00057603
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Oct 5 1974 12:00AM