FRACTURE CHARACTERISTICS OF STRUCTURAL STEELS AND WELDMENTS
This report presents the findings of a scanning electron microscope study of the tensile, fatigue, and impact fracture characteristics of a carbon steel; two high strength, low-alloy steels; and a high-strength steel weldment. Tension and fatigue specimens were tested in as-received, hydrogen-embrittled, and temper-embrittled conditions, while impact specimens were tested in the as-received condition only. The failure mode of embrittled and unembrittled weldments containing induced weld defects was also studied. The hydrogen-embrittled, high-strength steels exhibited large reductions in ductility and fatigue life. The fracture surfaces of these specimens contained a dispersion of fish-eyes and craters. Tempers embrittling the high-strength steels increased their susceptibility to lamellar tearing. The carbon steel was not as susceptible to either hydrogen or temper embrittlement as the high-strength steels. Crack nucleation in the unembrittled weldments occurred at the weld defect, while failure in the embrittled weldments began at both an outside edge and the weld defect.
Army Construction Engineering Research LaboratoryP.O. Box 4005
Champaign, IL USA 61820
- Aleszka, J
- Kim, Y G
- Publication Date: 1975-11
- Features: Figures; References; Tables;
- Pagination: 111 p.
- TRT Terms: Carbon steel; Defects; Electron microscopes; Embrittlement; Fatigue (Mechanics); Fracture mechanics; High strength steel; Structural steel; Tensile properties; Weldments; Welds
- Uncontrolled Terms: Fracture; Weld defects
- Subject Areas: Bridges and other structures; Highways;
- Accession Number: 00131382
- Record Type: Publication
- Report/Paper Numbers: Technical Rpt. M-170Final Rpt.
- Files: TRIS
- Created Date: May 14 1976 12:00AM