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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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12 Dec 1972
TL;DR: A survey of the results of five years electron fractography as conducted at the National Aerospace Laboratory N.L.R. and the contribution of this work to the comprehension of fatigue cracking, ductile fracture, cleavage and stress corrosion is given in this paper.
Abstract: A survey is given of the results of five years electron fractography as conducted at the National Aerospace Laboratory N.L.R. and of the contribution of this work to the comprehension of fatigue cracking, ductile fracture, cleavage and stress corrosion.

49 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the influence of Al-5Ti and Zr master alloys on the structural characteristics and tensile properties of Al 12Zn-3Mg-2.5Cu aluminum alloy.

49 citations

Journal ArticleDOI
TL;DR: In this paper, preliminary experiments were conducted to examine the process of environmentally enhanced creep crack growth in Inconel 718 alloy in terms of possible mechanisms and rate controlling processes, and the results showed that crack growth was intergranular in air and in vacuum with brittle appearing grain boundary separation in air, and extensive cavity formation in vacuum.
Abstract: Inconel 718 alloy is widely used in high temperature applications. Because of its sensitivity to environmentally enhanced crack growth at high temperatures, its use has been limited to modest temperatures (i.e., below 973 K). To improve its performance and to better predict its service life, it is important to develop a better understanding of the processes of crack growth at high temperatures in this alloy. It has been shown that the creep crack growth rates (CCGR) in air are at least two orders of magnitude faster than those in vacuum or inert environments. CCGR were also found to depend strongly on temperature. Fractographic studies showed that crack growth was intergranular in air and in vacuum with brittle appearing grain boundary separation in air and extensive cavity formation in vacuum. The increased CCGR in air has been attributed to the enhancement by oxygen; principally through enhanced cavity nucleation and growth by high-pressure carbon monoxide/dioxide formed by the reactions of oxygen that diffused into the material with the grain boundary carbides. The appropriateness of this mechanism, however, may be questioned by the absence of cavitation on the crack surfaces produced in air. As such the mechanism for crack growth needs to bemore » re-examined. Because of the presence of moisture in air, the possible influence of hydrogen needs to be considered as well. In this study, preliminary experiments were conducted to examine the process of environmentally enhanced creep crack growth in Inconel 718 alloy in terms of possible mechanisms and rate controlling processes. Creep crack growth experiments were carried out in air, oxygen (from 2.67 to 100 kPa), moist argon (water vapor) and pure argon at temperatures from 873 to 973 K.« less

49 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of corrosion on fatigue behavior of corroded steel was investigated by using Hydraulic Servo Universal Fatigue Testing Machine, and the results indicated that the presence of corrosion pits, produced by the method of constant temperature and humidity with prior immersion in saturated NaCl solution for about 2min, significantly reduced the fatigue life of the material used in this study.
Abstract: The objective of this article is to provide datum to engineers on the fatigue behavior of corroded steel plate and the material used in this study was Q235 steel. The effect of corrosion on fatigue behavior of corroded steel was investigated by using Hydraulic Servo Universal Fatigue Testing Machine. The results indicate that the presence of corrosion pits, produced by the method of constant temperature and humidity with prior immersion in saturated NaCl solution for about 2 min, significantly reduces the fatigue life of corroded steel. The relationship between (a) fractal dimension of roughness surface and fatigue life of corroded steel plate, (b) fractal dimension of roughness surface and corrosion ratio, and (c) corrosion ratio and fatigue life of corroded steel plate was also studied. In this paper, the fractal dimension refers to the fractal dimension of roughness surface but not to the fractal dimension of the fracture surfaces. In the end of this paper, the morphology characterization and fractography were also analyzed by using 3D Profiling and stereoscopic microscope, respectively.

49 citations

Journal ArticleDOI
TL;DR: Fractography of sintered nanophase and commercial coarser TiO 2 powders was carried out using scanning electron microscopy in this article, where the authors compared the fracture properties of the two powders and found that the nanophases had smaller voids and the sintering temperature for completely transgranular fracture was 200°C lower.

48 citations


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