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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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Journal ArticleDOI
TL;DR: In this paper, a multiple micromechanisms-based model is developed to quantitatively relate the fracture toughness of partially recrystallized 7XXX aluminum alloys to their fracture surface morphology.
Abstract: A multiple micromechanisms-based model is developed to quantitatively relate the fracture toughness of partially recrystallized 7XXX aluminum alloys to their fracture surface morphology. The model is verified using the experimental data on partially recrystallized 7050 alloy reported in the companion article. It is then used to obtain a quantitative relationship between the fracture toughness and microstructural attributes. The model relates fracture toughness to microstructural parameters such as degree of recrystallization, grain size of recrystallized grains, thickness of recrystallized regions, total surface area of the constituent particles per unit volume, and microstructural anisotropy. The model predicts the changes in the fracture toughness with the specimen orientation.

51 citations

Journal ArticleDOI
TL;DR: In this article, the fracture and fatigue characteristics of several cemented carbide grades are investigated as a function of their microstructure, and the influence of binder chemical nature and content on hardness, flexural strength, fracture toughness and fatigue crack growth (FCG) behavior is evaluated.
Abstract: The fracture and fatigue characteristics of several cemented carbide grades are investigated as a function of their microstructure. In doing so, the influence of binder chemical nature and content (Co and 76 wt.% Co–24 wt.% Ni), as well as carbide grain size on hardness, flexural strength, fracture toughness and fatigue crack growth (FCG) behavior is evaluated. Mechanical testing is combined with a detailed inspection of crack–microstructure interaction, by means of scanning electron microscopy, in order to evaluate crack-path tortuosity and to discern fracture and fatigue micromechanisms within the metallic binder. Results show that CoNi-base hardmetals exhibit slightly lower hardness but higher toughness values than Co-base grades. Meanwhile, flexural strength is found to be rather independent of the binder chemical nature. Regarding FCG behavior, experimental results indicate that: (1) FCG threshold (Kth) values for coarse-grained grades are higher than those measured for the medium-grained ones; and (2) fatigue sensitivity levels exhibited by CoNi- and Co-base cemented carbides, for a given binder mean free path, are similar. These findings are rationalized on the basis of the increasing relevance of crack deflection mechanisms as microstructure gets coarser and the evidence of similar fatigue degradation phenomena within the binder independent of its chemical nature, respectively.

51 citations

Journal ArticleDOI
TL;DR: In this article, the fatigue behavior of laser-engineered net shaping (LENS) deposited Ti-6Al-4V is studied in the as built condition, and the influence of microstructure and physical defects on fatigue performance is analyzed through microscopy and fractography.
Abstract: The fatigue behaviour of laser engineered net shaping (LENS) deposited Ti–6Al–4V is studied in the as built condition. The fatigue properties are measured, and the influence of microstructure and physical defects on fatigue performance is analysed through microscopy and fractography. Fine basketweave microstructure is obtained using a substrate with large equiaxed grains. The presence and location of unmelted particles are observed to significantly affect fatigue life. On the other hand, smaller gas porosity is not found to have major effect on the fatigue life. Further, the fatigue properties in a ‘repair’ condition are evaluated through samples consisting of LENS deposited parts joined to a preexisting wrought part. The properties are compared with the as built LENS parts.

50 citations

Journal ArticleDOI
TL;DR: In this article, the effect of anisotropy, triaxiality factor and Lode angle on the failure of X100 pipeline steel is studied. And the results show that triaxia causes the failure to occur sooner and LODE angle has no effect on the failures in triaxials higher than that of simple tension.

50 citations

Journal ArticleDOI
TL;DR: In this paper, the relationship between fatigue resistance and environmental conditioning by the fractographic analysis of the fracture surfaces was investigated, and it was verified that temperature is the most detrimental factor in environmental conditioning for fatigue.
Abstract: This paper is concerned with the understanding of the relationship between fatigue resistance and environmental conditioning by the fractographic analysis of the fracture surfaces. It assesses the fracture mode of fatigue tested laminates, carried out at different temperatures: −55 °C, +20 °C and +80 °C, and under two moisture contents, dry and 75% of saturated condition. It is verified that temperature is the most detrimental factor in environmental conditioning for fatigue. The influence of the moisture content in the fatigue life of the composite depends on the temperature.

50 citations


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