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The Role Of Hydrogen In The Stress Corrosion Failure Of High Strength A1 Zn Mg Alloys And Sensitised Austenitic Stainless Steels
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Book Synopsis The Role of Hydrogen in the Stress Corrosion Failure of High Strength A1-Zn-Mg Alloys and Sensitised Austenitic Stainless Steels by : L. Christodoulou
Download or read book The Role of Hydrogen in the Stress Corrosion Failure of High Strength A1-Zn-Mg Alloys and Sensitised Austenitic Stainless Steels written by L. Christodoulou and published by . This book was released on 1978 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report is divided into two parts covering each of the materials studied. Part 1. It has been found that exposure of an Al-Zn-Mg alloy to water vapour saturagated air results in loss of ductility and subsequent formation of hydrogen bubbles at high energy sites such as grain boundaries. The rate of embrittlement depends upon the prior heat treatment of the alloy: thus for a given hydrogen level one microstructure may be brittle while another may still exhibit some ductility. Fractographic studies have indicated that the distribution of hydrogen within the alloy determines the mode of fracture. Part 2. Experimental techniques have been developed to study the stress corrosion of stainless steel. Preliminary characterisation of the material (302 grade stainless steel) is in progress. In both parts of the report proposed future studies are described.
Book Synopsis The Role of Hydrogen in the Stress Corrosion Failure of High Strength Al-Zn-Mg Alloys and Sensitized Austenitic Stainless Steels by : L. Christodoulou
Download or read book The Role of Hydrogen in the Stress Corrosion Failure of High Strength Al-Zn-Mg Alloys and Sensitized Austenitic Stainless Steels written by L. Christodoulou and published by . This book was released on 1980 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation into the effect of exposure of Al-Zn-Mg alloys to water vapour has shown that hydrogen, produced by the reaction is absorbed by both the alloy grain boundaries and matrix. The amount of absorbed hydrogen depends on the local chemistry and the metal/Oxide interface and is influenced by alloying additions. Attainment of a critical concentration of dissolved hydrogen in the boundaries leads to brittle intergranular fracture on the subsequent application of stress. Attainment of a critical hydrogen concentration in the matrix leads to transgranular cleavage fracture. Depending upon the alloy composition and heat treatment bubbles of gaseous hydrogen can be formed at suitable sites within the alloys such as grain boundary particles. The formation of grain boundary bubbles reduces embrittlement by reducing the local concentration of dissolved hydrogen. It is proposed that the interaction of stress and environmental variables with the above criteria governs the environmental failure of Al-Zn-Mg alloys in aqueous and water vapour containing environments. It is suggested that such failures are hydrogen embrittlement dominated.
Book Synopsis The Role of Hydrogen in the Stress Corrosion Failure of High Strength Al-Zn-Mg Alloys by : M. L. Yuen
Download or read book The Role of Hydrogen in the Stress Corrosion Failure of High Strength Al-Zn-Mg Alloys written by M. L. Yuen and published by . This book was released on 1984 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous studies have been shown that high strength A1-Zn-Mg based alloys suffer environment assisted cracking. In the present work, room temperature constant strain rate (.0001/s - 000001/s) and constant load tensile tests on A1 6% Zn 3% Mg and copper and chromium containing variants were extended to specimens pre-exposed to a steam environment at 120 C and to specimens tested in air, distilled water and salt solution. The embrittlement increased at lower strain rates, higher water content, and in the presence of chloride ions. In all cases, atomic hydrogen absorbed into the grain boundaries and the grain matrix causes grain boundary decohesion and cleavage. The ability to trap atomic hydrogen as H2 bubbles improves the embrittlement resistance. It is believed that the addition of copper to the alloy increases the hydrogen trapping efficiency, hence embrittlement resistance whereas in the chromium containing alloy, the oxide is probably modified to inhibit hydrogen entry. Originator supplied keywords include: Aqueous environments, cleavage, constant strain rate test, corrosion wedging effect, crack arrest, crack branching, dead load test, discontinuous crack growth (microscopic and macroscopic), dissolution, ductility ratio, grain hydrogen embrittlement, hydrogen permeation, life time ratio, pre-exposure steam environment.
Book Synopsis High Performance Stainless Steels by : Curtis W. Kovach
Download or read book High Performance Stainless Steels written by Curtis W. Kovach and published by . This book was released on 2000 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental and Metallurgical Factors of Stress-corrosion Cracking in High-strength Steels by : C. J. Slunder
Download or read book Environmental and Metallurgical Factors of Stress-corrosion Cracking in High-strength Steels written by C. J. Slunder and published by . This book was released on 1961 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrogen Embrittlement and Stress Corrosion Cracking by : Alexander Robert Troiano
Download or read book Hydrogen Embrittlement and Stress Corrosion Cracking written by Alexander Robert Troiano and published by ASM International. This book was released on 1984-01-01 with total page 356 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 1980 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Problem of Hydrogen in Steel by : A. R. Elsea
Download or read book The Problem of Hydrogen in Steel written by A. R. Elsea and published by . This book was released on 1963 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: This memorandum introduces the problem of delayed, brittle failures associated with hydrogen in steel, particularly high-strength steel. It is intended to help the steel user determine if he has such a problem. The effects of hydrogen on the mechanical properties of steel are dealt with, and the behavior of material susceptible to delayed, brittle failure is described. Also, the effects of such factors as strength level, magnitude of applied stress, hydrogen content, steel composition, test temperature, and strain rate on hydrogen embrittlement and the susceptibility to hydrogen-induced, delayed, brittle failure are discussed. Possible sources of hydrogen in steel and the types of tests useful in determining the susceptibility to delayed failure are outlined. (Author).
Book Synopsis The Effects of High Pressure, High Temperature Hydrogen on Steel by : Ellis E. Fletcher
Download or read book The Effects of High Pressure, High Temperature Hydrogen on Steel written by Ellis E. Fletcher and published by . This book was released on 1964 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report deals with the deleterious effects of hydrogen gas on steel at elevated temperatures and/or pressures. Hydrogen attack on steels is manifest as decarburization, intergranular fissuring, or blistering. These conditions result in lowered tensile strength, ductility, and impact strength. The reaction of hydrogen with iron carbide to form methane is probably the most important chemical reaction involved in the attack on steel by hydrogen. Attack of steel at elevated temperatures and pressures is limited or prevented by the following measures: (1) use of steel alloyed with strong carbide-forming elements, (2) use of liners of resistant alloy steels, and (3) substitution of resistant nonferrous alloys.
Book Synopsis Government reports annual index by :
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Role of Hydrogen in the Mechanism of Stress Corrosion Cracking of Austenitic Stainless Steels in Hot Chloride Media by : B. E. WILDE
Download or read book The Role of Hydrogen in the Mechanism of Stress Corrosion Cracking of Austenitic Stainless Steels in Hot Chloride Media written by B. E. WILDE and published by . This book was released on with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stress-corrosion Cracking in High Strength Steels and in Titanium and Aluminum Alloys by : Benjamin Floyd Brown
Download or read book Stress-corrosion Cracking in High Strength Steels and in Titanium and Aluminum Alloys written by Benjamin Floyd Brown and published by . This book was released on 1972 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies of Hydrogen Embrittlement and Stress-corrosion Cracking in an Aluminum-zinc-magnesium Alloy. [5. 6 Zn - 2. 6 Mg]. by :
Download or read book Studies of Hydrogen Embrittlement and Stress-corrosion Cracking in an Aluminum-zinc-magnesium Alloy. [5. 6 Zn - 2. 6 Mg]. written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Tensile tests have been carried out on a high-purity A1-5.6 Zn-2.6 Mg alloy hydrogenated by exposure to moist air. Results indicate that internal hydrogen embrittlement occurs by the formation and rupture of a stress-induced hydride at the grain boundaries. The hydride, identified by electron diffraction as A1H3, is shown to be unstable in laboratory air, reverting to aluminum. The hydride phase was not detected in specimens failed by SCC, despite evidence that hydrogen is transported ahead of advancing stress-corrosion cracks, and this leads to the possibility that a basically different mechanism may be responsible for SCC in this alloy.
Book Synopsis Hydrogen-induced, Delayed, Brittle Failures of High-strength Steels by : A. R. Elsea
Download or read book Hydrogen-induced, Delayed, Brittle Failures of High-strength Steels written by A. R. Elsea and published by . This book was released on 1964 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrogen Embrittlement of Structural Alloys. A Technology Survey by :
Download or read book Hydrogen Embrittlement of Structural Alloys. A Technology Survey written by and published by . This book was released on 1976 with total page 140 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.
Download or read book Current Programs written by and published by . This book was released on 1977 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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