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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 article, the authors used a scanning electron microscope to examine different sizes of fine and coarse precipitates and found that fine precipitates exhibited more cleavage type fracture than those with medium (M) and coarse (C) sizes.
Abstract: Fracture studies on differently aged specimens of IN738LC, tensile tested to failure at different temperatures with two different strain rates, were carried out using a scanning electron microscope. Specimens with fine-size γ′ precipitates (F) and duplex-size γ′ precipitates (D) exhibited generally more cleavage type fracture than those with medium (M) and coarse (C) size γ′ precipitates. {100}-faceted cleavage-type fracture was dominant at room temperature, while dimple fracture was dominant at 650°C. A different type of cleavage fracture was observed in the specimens broken at 750°C, which is attributed to secondary strengthening and change in flow mechanism at this temperature under slow strain rate conditions. At 850°C, F and D showed wider faceted cleavage fracture, while M and C showed dimple-ductile fracture. Low tensile fracture toughness correlates with cleavage fracture, while specimens exhibiting dimple fracture have higher ductility and toughness. Presence of few (Ta, Ti)C-type carbide particles along the grain boundaries probably enables easy intergranular crack propagation. Dimples, however, are postulated to be initiated by decohesion at the interface between the γ′ precipitate and the matrix. Notably such decohesion is initiated only on coarsened particles, not on the fine ones.

36 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive study of fatigue life and damage mechanisms of friction stir linear welded dissimilar aluminum-to-magnesium alloys in lap-shear configuration is presented.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of multilayer graphene, few-layer graphene and dynamic vulcanization on microstructure and fracture toughness of polypropylene (PP)/EPDM/graphene nanocomposites was investigated.

36 citations

Journal ArticleDOI
TL;DR: In this article, hydrogen-assisted stable crack growth (H-SCG) is associated with cleavage striations of a 300 nm spacing, observed using scanning electron microscopy and atomic force microscopy (AFM).

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023120
2022254
2021229
2020206
2019205
2018176