Investigation of fracture mechanical behavior of nodular cast iron and welded joints with parent-material-like weld metal
- Freiberg Univ. of Mining and Technology (Germany). Inst. of Materials Engineering
The focus of the investigations was the determination of fracture mechanical characteristics and crack resistance curves of the J-Integral and CTOD concept by application of the partial unloading compliance technique and D.C. potential drop technique (four point bend) under static load. The results show a close correlation between crack initiation values as well as crack resistance curves and graphite morphology parameters determined by means of quantitative microstructural analysis where the influence of the matrix (distance of graphite particles) dominates the crack resistance and fracture performance of ferritic nodular cast iron under consideration of the notch effect of graphite particles. SEM in-situ tensile tests showed that due to a beneficial shielding effect of the strength overmatching parent-material-like weld metal (mis-match ratio M = 1.21), cracks positioned directly in the plane of the fusion line did not deviate into the weld metal in spite of its lower toughness compared to that of the parent material. They also showed an unsymmetrical formation of damage in front of the crack tip.
- OSTI ID:
- 597683
- Report Number(s):
- CONF-9406335-; TRN: IM9812%%132
- Resource Relation:
- Conference: 26. national symposium on fracture mechanics, Idaho Falls, ID (United States), 28-30 Jun 1994; Other Information: PBD: 1995; Related Information: Is Part Of Fracture mechanics: 26. volume; Reuter, W.G. [ed.] [Lockheed Martin Idaho Technologies, Idaho Falls, ID (United States)]; Underwood, J.H. [ed.] [Army Armament Research and Development Center, Watervliet, NY (United States)]; Newman, J.C. Jr. [ed.] [National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center]; PB: 853 p.; ASTM special technical publication 1256
- Country of Publication:
- United States
- Language:
- English
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