Topic
Fractography
About: Fractography is a research topic. Over the lifetime, 5043 publications have been published within this topic receiving 86068 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the authors investigated the fracture initiation in the in situ TiB 2 /A356 composite by high cycle fatigue testing using smooth specimens, and showed that cracks first tend to propagate within the matrix and avoid TiB2 particles, and there is no cracking in in situTiB 2 particles.
33 citations
TL;DR: In this paper, the tensile and impact properties of X70 pipeline steels exposed to wet H 2 S environments were investigated by corrosion and mechanical testing, and the results suggest that the Charpy absorbed energy, tensile strength and reduction in area of X-70 steel decreased after H 2S corrosion.
32 citations
TL;DR: In this paper, the microstructure of the ordered intermetallic alloy with a nominal composition of Al66Fe9Ti24 is nearly single-phase L12 structure, with a few second phase agglomerates at some grain corners.
Abstract: The microstructure of the ordered intermetallic alloy with a nominal composition of Al66Fe9Ti24 is nearly single-phase L12 structure, with a few second phase agglomerates at some grain corners. Room temperature compression tests showed that this material exhibits a plastic strain of about 11% at fracture. Final fracture of the compression specimens occurred by a shear-off process along a surface oriented about 45 degrees to the compression axis. Fractographic analysis revealed that the fracture is transcrystalline and the fracture mode is mainly quasicleavage plus tearing. Transmission electron microscopy (TEM) was used to explore its deformation mechanisms. The dislocation density was low after homogenization, but is greatly increased during deformation. The deformation mode was found to be 〈110〉 {111} slip instead of twinning as in Al3Ti. The a〈110〉 superdislocations dissociated into two partials of a/3〈211〉-type, bounding a superlattice intrinsic stacking fault (SISF) on the {111} slip plane.
32 citations
TL;DR: In this article, the main concern of DP590 steel forming i.e. high strength and considerably good other mechanical properties is discussed. But, the major concern is not the high strength but the high cost.
Abstract: DP590 steel is used as an alternative material in automobile applications due to its high strength and considerably good other mechanical properties. However, major concern of DP590 steel forming i...
32 citations
TL;DR: In this paper, the authors studied the crack formation and growth in notched Al-Cu alloy coupons through high-resolution SEM fractography and found that crack closure, residual stress and crack front and plane orientation are major load interaction mechanisms whose synergistic action controls fatigue under variable amplitude loading.
Abstract: Natural fatigue crack formation and growth were studied in notched Al-Cu alloy coupons through high-resolution SEM fractography. The experiments were conducted under programmed loading conditions designed to induce microscopic marking of the crack formation and growth process under varying stress ratio and closure-free crack tip conditions. Control experiments were performed by switching between an air and vacuum environment. In air, varying the stress ratio from 0.74 down to 0.64 retards crack growth by up to a factor of five. This 'closure-free' stress ratio history effect totally disappears in vacuum, suggesting a significant environmental influence on stress ratio and its history. Crack-tip stress state appears to moderate environmental action, revealing a potential mechanism sensitive to residual stress. Consequently, crack closure, residual stress and crack front and plane orientation are identified as major load interaction mechanisms whose synergistic action controls fatigue under variable amplitude loading. The study also appears to suggest that as a consequence of the crack seeking the path of least resistance, load-sequence sensitive crack plane and front orientation may only induce retardation effects.
32 citations