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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, the microstructural characteristics of ultrafine grained low stacking faulty energy (SFE) brass processed by cryorolling were investigated by tensile tests and hardness measurements.

38 citations

Journal Article
J. Belan1
TL;DR: Belan et al. as discussed by the authors performed a fatigue test of INCONEL alloy 718 at 20 kHz with stress ration R = 1 (push-pull) at room temperature and found that this superalloy can still fracture after exceeding 108 cycles.
Abstract: J. Belan, Faculty of Mechanical Engineering, University of Žilina, Žilina, Slovak Republic INCONEL alloy 718 is a high-strength; corrosion-resistant nickel chromium material used at -253 °C to 705 °C for production of heat resistant parts of aero jet engine mostly. The fatigue test provided on this kind materials were done via low frequency loading up to this time. Nowadays, needs of results at higher volume of loading cycles leads to high frequency loading with aim to shorten testing time. Fatigue test of experimental material was carried out at frequency 20 kHz with stress ration R = 1 (push – pull) at room temperature. It was found that this superalloy can still fracture after exceeding 108 cycles. Besides fatigue test were microstructural characterisation and scanning electron microscopy (SEM) fractography evaluation done.

38 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructure and fracture behavior of dissimilar weldments of alloy 690 and SUS 304L for various additions of niobium (0.1, 1.03, 2.49, and 3.35 wt pct) in the flux were investigated.
Abstract: This study investigates the microstructure and fracture behavior of dissimilar weldments of alloy 690 and SUS 304L for various additions of niobium (0.1, 1.03, 2.49, and 3.35 wt pct) in the flux. With identical parameters and procedures, weldments were butt welded by the shielding metal arc welding (SMAW) process using three layers, with each layer being deposited in a single pass. The results indicate that the microstructure of the fusion zone was primarily dendritic and that the contents of Ni, Cr, and Fe within this zone remain relatively constant and resemble alloy 690. With Nb addition, it is noted that the microstructure changes from a cellular to columnar dendrite and equiaxed dendrite. Meanwhile, the dendrite arm spacing reduces and the secondary arms grow longer. Moreover, the composition of the interdendritic phase, whose precipitate volume percentage increases from 5 to 25 pct, changes from Al-Ti-O to Nb rich. The spread of the interdendritic phase is less in the root bead than in the cap bead due to the greater influence of base metal dilution in this region. Mechanical tests indicate that Nb addition increases the average hardness of the weldment and reduces its elongation prior to rupture. However, the tensile strength is essentially unchanged by Nb addition. It is found that the average hardness of the root bead is generally lower than the cap bead, and that the tensile specimens all rupture in the fusion zone, with the fracture surfaces exhibiting ductile features. It is noted that the cap bead tends to rupture interdendritically with increasing Nb addition. Finally, fractography shows that the dimples in the root become larger and shallower with Nb addition and are rich with an interdendritic phase.

38 citations

Journal ArticleDOI
TL;DR: A survey of the results of five years of study in the field of electron fractography conducted at the National Aerospace Laboratory (N.L.R.) to better understand of fracture mechanisms is given in this article.
Abstract: This review gives a survey of the results Of five years† of study in the field of electron fractography conducted at the National Aerospace Laboratory (N.L.R.) to sleek a better understanding of fracture mechanisms. It is largely based on a series of publicationsl-12 that appeared during these years. In general only the progress achieved purely by electron fractography will be discussed, although in a Jew cases use will be made of results, of transmission electron microscopy of thin foils and of optical microscopy.

38 citations


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