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  United States  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

• TRT Terms: Fracture properties; Heat affected zone (Metals); Joints (Engineering); Stresses; Welds
• Uncontrolled Terms: Stress intensity factors; Welded joints
• Subject Areas: Marine Transportation; Materials;

Filing Info

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