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Characterization Of Hydrogen Ingress In High Strength Alloys
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Book Synopsis Characterization of Hydrogen Ingress in High-Strength Alloys by :
Download or read book Characterization of Hydrogen Ingress in High-Strength Alloys written by and published by . This book was released on 1995 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ingress of hydrogen (H) in various high-strength alloys was investigated with a view to characterizing their susceptibility to hydrogen embrittlement (HE). A potentiostatic pulse technique was applied to three Fe-base alloys (AerMet 100, H11, and A-286), two Cu-containing alloys (Be-Cu and alloy K-500), a superferritic stainless steel (Sea-Cure), and three Beta-Ti alloys (Ti-15V-3Cr-3Al-3Sn, Beta-21S, and Beta-C) in 1 mol/L acetic acid-1 mol/L sodium acetate. The data were analyzed using a diffusion/trapping model to obtain the irreversible trapping constant (k) and H entry flux for each alloy. The order of the k values for AerMet 100, H11, and two high-strength steels previously studied (4340 and 18Ni) inversely parallels their threshold stress intensities for stress corrosion cracking. Likewise, the k values for the other alloys can be correlated with their observed resistances to HE according to the following groups: (1) alloy A-286,18Ni steel, H11, Be-Cu, and also alloy 718 from earlier work; (2) annealed/aged and direct aged alloy K-500; and (3) Ti alloys. The trapping characteristics of Sea-Cure could not be determined. However, the propensity of the S44660 alloy to undergo HE at cathodic protection potentials can be attributed to changes in the oxide that lead to a less restricted entry of H. jg p2.
Book Synopsis The Resistance of High-Strength Alloys to Hydrogen Embrittlement by :
Download or read book The Resistance of High-Strength Alloys to Hydrogen Embrittlement written by and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The resistance of an alloy to hydrogen embrittlement (HE) is strongly influenced by the presence of microstructural heterogeneities, which can provide sites to trap hydrogen. The entry and trapping of hydrogen in a range of high-strength alloys have been investigated with a technique referred to as hydrogen ingress analysis by potentiostatic Pulsing (HIAPP). Data were analyzed by using a diffusion/trapping model to determine entry and trapping parameters for high-strength steels, Precipitation-hardened and work-hardened nickel-base alloys, and titanium alloys. For most of the alloys studied, the observed resistance to HE appeared to be determined primarily by the alloy's intrinsic Susceptibility as defined by the trapping characteristics; that is, the H entry flux generally has only a secondary effect on the resistance to HE. However, in one case, the HE resistance was attributable to a low entry flux. This type of case highlights the need for characterizing alloys in terms of both trapping capability and rate of H entry to account for differences observed in their HE resistance.
Book Synopsis Evaluation of a Diffusion/Trapping Model for Hydrogen Ingress in High- Strength Alloys by :
Download or read book Evaluation of a Diffusion/Trapping Model for Hydrogen Ingress in High- Strength Alloys written by and published by . This book was released on 1992 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alloys developed to improve properties such as strength, weight, and corrosion resistance often show decreased resistance to hydrogen embrittlement. The objective of this research was to determine the hydrogen ingress behavior of high performance alloys, particularly in terms of irreversible trapping, with a view to characterizing their interaction with hydrogen and resulting susceptibility to hydrogen embrittlement. A technique referred to as hydrogen ingress analysis by potentiostatic pulsing (HLAPP) was applied to three beta- titanium alloys (Beta-C, Ti10V-2Fe-3Al, and Ti-l3V- 11Cr-3A1), an alp titanium alloy (Ti-6AI-4V), and two copper-nickel alloys (Marinel and Monel K-500). Anodic current transients were obtained for these alloys in an acetate buffer (1 mol/L HAc-1 mol/L NaAc where Ac = acetate) and analyzed using a diffusion/trapping model under interface control conditions to evaluate the trapping constant and hydrogen entry flux. A marked increase observed in the trapping constants for the beta-titanium alloys with aging is attributed to precipitation of the secondary alpha phase. Aging also affects the passive film and therefore the hydrogen entry flux. The trapping constants for aged Marinel and Monel K-500 are not considered to differ significantly, but a smaller entry flux for the Marinel appears to account, at least partly, for the lower susceptibility to hydrogen embrittlement reported for Marinel.
Book Synopsis Characterization of Hydrogen Embrittlement Sensitivity in High Hardness Steels by : David Ahlen Salley
Download or read book Characterization of Hydrogen Embrittlement Sensitivity in High Hardness Steels written by David Ahlen Salley and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High hardness steels can be affected by delayed brittle cracking often attributed to hydrogen embrittlement. Improved resistance to hydrogen embrittlement would be beneficial to many industries including military, automotive, and high-rise construction. While other prevention methods include coating, trapping, and barriers, design efforts in this study were focused on improving intrinsic properties to be more resistant to hydrogen embrittlement. Four alloys targeting 477 – 534 HB were designed and produced in-house and compared against a commercial grade 500 HB alloy. Charpy V-notch (CVN) impact toughness and tensile specimens were made according to ASTM E23 and ASTM E8 to characterize mechanical properties. Hydrogen embrittlement testing was performed using ASTM E8 test samples electro-chemically charged in either sodium hydroxide or sulfuric acid with thiourea in solution. Results suggested that alloying for lower strength and better toughness by reducing C and Mn results in lower hydrogen embrittlement susceptibility.
Book Synopsis Analysis of Surface Hydrogen in High-strength Steels by : McDonnell, D. B. (Donald Brian)
Download or read book Analysis of Surface Hydrogen in High-strength Steels written by McDonnell, D. B. (Donald Brian) and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Effects of Hydrogen on the High-temperature Flow and Fracture Characteristics of Metals by : H. E. McCoy (Jr.)
Download or read book Effects of Hydrogen on the High-temperature Flow and Fracture Characteristics of Metals written by H. E. McCoy (Jr.) and published by . This book was released on 1964 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Corrosion of Aluminum and Aluminum Alloys by : Joseph R. Davis
Download or read book Corrosion of Aluminum and Aluminum Alloys written by Joseph R. Davis and published by ASM International. This book was released on 1999-01-01 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Hydrogen on Materials by : Brian Somerday
Download or read book Effects of Hydrogen on Materials written by Brian Somerday and published by ASM International. This book was released on 2009-01-01 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research and commercial activity in developing hydrogen as a fuel is driving increased attention on hydrogen-materials interactions. In particular, a renewed and intensifying interest in developing hydrogen fuel cells has prompted extensive research with the objective to enable the safe design of components for transporting and storing hydrogen fuel. This volume is the proceedings from the premier conference on hydrogen effects in materials, bridging scientific research and engineering applications. The proceedings volume highlights several themes: the technological importance of hydrogen effects on structural materials; the impact of bridging science and engineering; and the opportunity to apply new research tools, including simulation techniques as well as experimental methods.
Book Synopsis Gaseous Hydrogen Embrittlement of Materials in Energy Technologies by : Richard P Gangloff
Download or read book Gaseous Hydrogen Embrittlement of Materials in Energy Technologies written by Richard P Gangloff and published by Woodhead Publishing. This book was released on 2012-01-16 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many modern energy systems are reliant on the production, transportation, storage, and use of gaseous hydrogen. The safety, durability, performance and economic operation of these systems is challenged by operating-cycle dependent degradation by hydrogen of otherwise high performance materials. This important two-volume work provides a comprehensive and authoritative overview of the latest research into managing hydrogen embrittlement in energy technologies. Volume 1 is divided into three parts, the first of which provides an overview of the hydrogen embrittlement problem in specific technologies including petrochemical refining, automotive hydrogen tanks, nuclear waste disposal and power systems, and H2 storage and distribution facilities. Part two then examines modern methods of characterization and analysis of hydrogen damage and part three focuses on the hydrogen degradation of various alloy classes With its distinguished editors and international team of expert contributors, Volume 1 of Gaseous hydrogen embrittlement of materials in energy technologies is an invaluable reference tool for engineers, designers, materials scientists, and solid mechanicians working with safety-critical components fabricated from high performance materials required to operate in severe environments based on hydrogen. Impacted technologies include aerospace, petrochemical refining, gas transmission, power generation and transportation.
Book Synopsis Hydrogen Embrittlement (HE) Susceptibility of High Strength Tempered Martensite Steels by : Tuhin Das
Download or read book Hydrogen Embrittlement (HE) Susceptibility of High Strength Tempered Martensite Steels written by Tuhin Das and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Hydrogen embrittlement (HE) is identified as a serious problem even after decades of extensive research, in various industries starting from aerospace to fastener. HE is primarily responsible for the degradation of mechanical performances of a number of metals and alloys that are used nowadays. Among them, high strength steels owing to their widespread applications also suffer from HE failures to a great deal. Hence, this thesis focuses on fundamental issues influencing the susceptibility of three different grades of high strength steels designed for fastener applications.The present work includes investigation of mechanical properties both in presence and absence of hydrogen, microstructural characterisations and direct hydrogen quantification. The mechanical property test methodology is a modification of the ASTM F1624 standard test method to determine hydrogen embrittlement threshold in steels, which facilitates a unique approach to investigate the HE susceptibility of these steel grades. The microstructural characterisation process involves scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) to identify the potential hydrogen trap states in microstructure, both qualitatively and quantitatively. Microstructural characterisation also provides useful information to predict local microstructural evolution in the presence of hydrogen and stress. Altogether, a structure-property relationship has been developed for these materials employing a comprehensive investigation process. In addition to it, fracture surface mapping using SEM indicates the mechanisms of failure associated with HE process in these materials. And finally, direct hydrogen quantification methodology using thermal desorption spectroscopy (TDS) provides further experimental evidence to the above-mentioned facts. Thus, in this work a combined approach involving various research techniques and knowledge has been utilised to investigate the susceptibility of the steel grades and rank them according to their performances under the influence of hydrogen." --
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Perspectives in Hydrogen in Metals by : M. F. Ashby
Download or read book Perspectives in Hydrogen in Metals written by M. F. Ashby and published by Elsevier. This book was released on 2017-09-21 with total page 773 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perspectives in Hydrogen in Metals: Collected Papers on the Effect of Hydrogen on the Properties of Metals and Alloys discusses the advancement in the understanding of the effects of hydrogen on the physical and mechanical properties of metals and alloys. The title first covers solubility and other thermodynamic properties, and then proceeds to tackling diffusivity. Next, the selection discusses the trapping of hydrogen by defects and hydride formation. The text also talks about hydrogen in amorphous metals, along with the effect of hydrogen on plastic deformation. The last chapter covers hydrogen embrittlement. The book will be of great use chemists, metallurgists, and materials engineers.
Book Synopsis Effects of Hydrogen Gas on Metals at Ambient Temperature by : James Edward Campbell
Download or read book Effects of Hydrogen Gas on Metals at Ambient Temperature written by James Edward Campbell and published by . This book was released on 1970 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the basis of the information available, steels(ferritic, martensitic, and bainitic), nickel-base alloys, and titanium alloys become embrittled in pure-hydrogen-gas environments at ambient temperature. The embrittling effect is detected by making tension tests on sharp-notched specimens in an environment of high-purity hydrogen gas and, for comparison, tests on similar specimens in an inert gas at the same temperature and pressure. If the material is embrittled by hydrogen, its notch tensile strength will be reduced. The effect is more pronounced as the hydrogen-gas pressure is increased, but in some cases the embrittling effect has been observed at 1 atmosphere of pressure. The effect is more pronounced for the high-strength steels and high-strength nickel and titanium alloys than for the low-strength alloys. In unnotched specimens exposed to a pure-hydrogen environmental, hydrogen embrittlement manifiests itself as a decrease in ductility. Results of tests on stable austenitic stainless steels such as Types 310 and 316, or certain aluminum alloys such as 6061-T6, 2219-T6, and 7075-T73, and beryllium copper indicate that there is no significant evidence of embrittlement of these alloys in hydrogen gas at pressures up to 10,000psi.
Book Synopsis Exploratory Development on the Hydrogen Embrittlement of High Strength Steel During Machining by : Bhagwan K. Das
Download or read book Exploratory Development on the Hydrogen Embrittlement of High Strength Steel During Machining written by Bhagwan K. Das and published by . This book was released on 1973 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: The experimental program was undertaken to investigate the possibility of machining fluids being a source of hydrogen for a given high strength aerospace structural alloy. Unexpected catastrophic failure of high strength steel structures can occur as a result of hydrogen embrittlement if the material absorbs high levels of hydrogen during fabrication or when the hardware is in use. Test specimens made of AISI 4340 high strength steel of known hydrogen concentration were subjected to a specified schedule of gentle and abusive milling and grinding operations using different machining fluids. Following the machining operations the specimens were analyzed for excess hydrogen above the base level with a Boeing developed 'Ultrasensitive Hydrogen Analysis System'. A total of six different machining fluids with different active chemical components were used in this study. Experimental results are presented with a statistical analysis of the hydrogen concentration data.
Book Synopsis Evaluation of a Diffusion/trapping Model for Hydrogen Ingress in High Strength Alloys by : Bruce G. Pound
Download or read book Evaluation of a Diffusion/trapping Model for Hydrogen Ingress in High Strength Alloys written by Bruce G. Pound and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Techniques for the Characterization of Hydrogen in Metals by : Minerals, Metals and Materials Society
Download or read book Advanced Techniques for the Characterization of Hydrogen in Metals written by Minerals, Metals and Materials Society and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
