Topic
Fractography
About: Fractography is a research topic. Over the lifetime, 5043 publications have been published within this topic receiving 86068 citations.
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TL;DR: In this paper, the structural and mechanical anisotropy of SLMed Inconel 718 (IN718) superalloy were investigated by means of XRD, SEM, EBSD and small punch testing (SPT) method at room and high temperatures.
44 citations
TL;DR: In this article, the tensile properties, microstructural features and fractography of the joints were measured and investigated using tensile test, optical and scanning electron microscopes, respectively.
Abstract: In this investigation, response surface methodology was used to predict and optimize the tensile properties of friction stir welded AA 7020 aluminum alloy. Tensile properties, microstructural features and fractography of the joints were measured and investigated using tensile test, optical and scanning electron microscopes, respectively. In addition, the influences of friction stir welding parameters on tensile properties of the joints were examined thoroughly. The results revealed that with increasing the heat input, the tensile strength of the joints increased up to a maximum value and then decreased, where the elongation of the joints increased continuously. Moreover, the optimal condition to obtain a maximum of tensile strength was 1,055 rpm, 97 mm/min and 7.4 kN, where as for tensile elongation was 1,320 rpm, 72 mm/min and 7 kN.
44 citations
TL;DR: In this paper, the repair volume of AISI H13 tool steel samples with hemisphere-shaped defects was reconstructed through reverse engineering and the samples were repaired by laser-aided direct metal deposition (DMD) using Co-based alloys powder as the filler material.
Abstract: In this work, the repair volume of AISI H13 tool steel samples with hemisphere-shaped defects was reconstructed through reverse engineering and the samples were repaired by laser-aided direct metal deposition (DMD) using Co-based alloys powder as the filler material. Microstructure characterization and elemental distribution of deposits were analyzed using optical microscope (OM), scanning electron microscope (SEM), and energy dispersive spectrometry (EDS). Mechanical properties of repaired samples were evaluated via tensile test and microhardness measurement. The experiment showed that a gap between deposits and substrate exists if only employing the tool path generated from the reconstructed repair volume but the gap can be removed by depositing an extra layer covering that region. Microstructure and tensile test confirmed strong metallurgical bond in the interface. Defect-free columnar structure dominated the deposits near the interface while other regions of deposits consisted of dendrite structure with interdendritic eutectics. The tensile test showed that the repaired samples have a higher ultimate tensile strength (UTS) and lower ductility compared with those of base metal. Fractography from tensile test showed repaired samples fractured brittlely at the deposits section with cracking propagating along the grain boundaries. The hardness measurement showed that the deposited layers have a much higher hardness in comparison to the substrate.
44 citations
TL;DR: In this article, a 3D X-ray computed tomography (XCT) was used for deterministic fatigue strength analysis of relatively large cast components and also probabilistic fatigue design of heavy-section castings.
44 citations
TL;DR: In this article, the effect of thickness on crack initiation, crack growth and the geometry and fractography of the fracture surface was investigated on mild steel specimens of various thicknesses, and it was found that both crack initiation and crack growth were more rapid in the thinner specimens.
44 citations