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  • METALLIC MATERIALS  (18)
  • CHEMISTRY AND MATERIALS (GENERAL)  (3)
  • 1
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    Effects of R-ratio on fatigue crack growth in a Ti-24Al-11Nb alloy (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The microscopic fatigue crack behavior in a Ti-24Al-11Nb alloy was investigated. Particular attention was given to the path of the fatigue crack through the microstructure, the fracture mode, and the effects of R-ratio and crack closure on the fatigue crack growth behavior. The FCGR of the alloy at R = 0.5 was an order of magnitude higher than that at R = 0.1.
    Keywords: METALLIC MATERIALS
    Type: Scripta Metallurgica et Materialia (ISSN 0956-716X); 28; 10; p. 1267-1272.
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  • 2
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    A film-rupture model of hydrogen-induced, slow crack growth in acicular alpha-beta titanium (1976)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A study has been conducted of the terrace-like fracture morphology of gaseous hydrogen-induced crack growth in acicular alpha-beta titanium alloys in terms of specimen configuration, magnitude of applied stress intensity, test temperature, and hydrogen pressure. Although the overall appearance of the terrace structure remained essentially unchanged, a distinguishable variation is found in the size of the individual terrace steps, and step size is found to be inversely dependent upon the rate of hydrogen-induced slow crack growth. This inverse relationship is independent of all the variables investigated. These observations are quantitatively discussed in terms of the formation and growth of a thin hydride film along the alpha-beta boundaries and a qualitative model for hydrogen-induced slow crack growth is presented, based on the film-rupture model of stress corrosion cracking.
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 7A; May 1976
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  • 3
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    Influence of temperature and the role of chromium on the kinetics of sulfidation of 310 stainless steel (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Keywords: METALLIC MATERIALS
    Type: Oxidation of Metals; 12; Apr. 197
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  • 4
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    Corrosion of 310 stainless steel in H2-H2O-H2S gas mixtures Studies at constant temperature and fixed oxygen potential (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: (Previously announced in STAR as N81-19276)
    Keywords: METALLIC MATERIALS
    Type: Metallurgical Transactions A - Physical Metallurgy and Materials Science; 14A; Feb. 198
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  • 5
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    Utilizing various test methods to study the stress corrosion behavior of Al-Li-Cu alloys (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Recently, much attention has been given to aluminum-lithium alloys because of rather substantial specific-strength and specific-stiffness advantages offered over commercial 2000and 7000-series aluminum alloys. An obstacle to Al-Li alloy development has been inherent limited ductility. In order to obtain a more refined microstructure, powder metallurgy (P/M) has been employed in alloy development programs. As stress corrosion (SC) of high-strength aluminum alloys has been a major problem in the aircraft industry, the possibility of an employment of Al-Li alloys has been considered, taking into account a use of Al-Li-Cu alloys. Attention is given to a research program concerned with the evaluation of the relative SC resistance of two P/M processed Al-Li-Cu alloys. The behavior of the alloys, with and without an addition of magnesium, was studied with the aid of three test methods. The susceptibility to SC was found to depend on the microstructure of the alloys.
    Keywords: METALLIC MATERIALS
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  • 6
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    Stress-corrosion behavior of aluminum-lithium alloys in aqueous environments (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The stress corrosion susceptibility of two powder metallurgy (P/M) alloys, Al-Li-Cu and Al-Li-Cu-Mg two mechanically attrited (M/A) alloys, Al-Li-Cu and Al-Li-Mg; and two wrought, ingot alloys, X-2020 and AA7475, are compared. Time-dependent fracture in an aqueous sodium chloride environment under alternate immersion condition was found to vary significantly between alloys. The stress corrosion behavior of the two powder metallurgy processed alloys was studied in detail under conditions of crack initiation, static crack growth, and fatigue crack growth. A variety of stress corrosion tests were performed including smooth surface, time-to-failure tests; potentiostatic tests on smooth surfaces exposed to constant applied strain rates; and fracture mechanics-type tests under static and cyclic loads. Both alloys show surface pitting and subsequent intergranular corrosion. Pitting is more severe in the magnesium-bearing alloy and is associated with stringer particles strung along the extrusion direction as a result of P/M processing.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-85853 , A-9499 , NAS 1.15:85853
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  • 7
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    Corrosion of 310 stainless steel in H2-H2O-H2S gas mixtures: Studies at constant temperature and fixed oxygen potential (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Corrosion of SAE 310 stainless steel in H2-H2O-H2S gas mixtures was studied at a constant temperature of 1150 K. Reactive gas mixtures were chosen to yield a constant oxygen potential of approximately 6 x 10 to the minus 13th power/cu Nm and sulfur potentials ranging from 0.19 x 10 to the minus 2nd power/cu Nm to 33 x 10 to the minus 2nd power/cu Nm. The kinetics of corrosion were determined using a thermobalance, and the scales were analyzed using metallography, scanning electron microscopy, and energy dispersive X-ray analysis. Two corrosion regimes, which were dependent on sulfur potential, were identified. At high sulfur potentials (p sub S sub 2 less than or equal to 2.7 x 10 to the minus 2nd power/cu Nm) the corrosion rates were high, the kinetics obeyed a linear rate equation, and the scales consisted mainly of sulfide phases similar to those observed from pure sulfication. At low sulfur potentials (P sub S sub 2 less than or equal to 0.19 x 10 to the minus 2nd power/cu Nm) the corrosion rates were low, the kinetics obeyed a parabolic rate equation, and scales consisted mainly of oxide phases.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-81242 , A-8349
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  • 8
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    Influence of hydrogen chemisorption kinetics on the interpretation of hydrogen transport through iron membranes (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The influence of a specific surface reaction on the transport of gas-phase hydrogen through iron membranes has been investigated on the basis of model calculations. The surface reaction involves an adsorbed molecular hydrogen precursor between the gas phase and the dissociated chemisorbed state. The calculations demonstrate that the surface reaction for the H2/Fe system makes significant contributions to the time delay associated with the transient hydrogen transport through iron membranes, even under conditions where the steady-state hydrogen transport is independent of the surface reaction. These contributions to the time delay are interpreted in terms of an effective diffusivity, which is a function of the pressure on the entrance side and the thickness of the membrane.
    Keywords: METALLIC MATERIALS
    Type: Scripta Metallurgica; 15; Aug. 198
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  • 9
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    The stress-corrosion behavior of Al-Li-Cu alloys: A comparison of test methods (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two powder metallurgy processed (Al-Li-Cu) alloys with and without Mg addition were studied in aqueous 3.5% NaCl solution during the alternate immersion testing of tuning fork specimens, slow crack growth tests using fracture mechanics specimens, and the slow strain rate testing of straining electrode specimens. Scanning electron microscopy and optical metallography were used to demonstrate the character of the interaction between the Al-Li-Cu alloys and the selected environment. Both alloys are susceptible to SC in an aqueous 3.5% NaCl solution under the right electrochemical and microstructural conditions. Each test method yields important information on the character of the SC behavior. Under all conditions investigated, second phase particles strung out in rows along the extrusion direction in the alloys were rapidly attacked, and played principal role in the SC process. With time, larger pits developed from these rows of smaller pits and under certain electrochemical conditions surface cracks initiated from the larger pits and contributed directly to the fracture process. Evidence to support slow crack growth was observed in both the slow strain rate tests and the sustained immersion tests of precracked fracture mechanics specimens. The possible role of H2 in the stress corrosion cracking process is suggested.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-84287 , A-9057 , NAS 1.15:84287
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  • 10
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    Phase relations in the Fe-Ni-Cr-S system and the sulfidation of an austenitic stainless steel (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: METALLIC MATERIALS
    Type: Oxidation of Metals; 13; Feb. 197
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