Evaluation of a Diffusion/trapping Model for Hydrogen Ingress in High Strength Alloys

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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:

Evaluation of a Diffusion/Trapping Model for Hydrogen Ingress in High-Strength Alloys

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Total Pages : 31 pages
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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 1987 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report covers work performed during the first year of a program to apply a diffusion/trapping model for hydrogen ingress in three high-strength alloys, AISI 4340 steel, Monel K500, and MP35N. The model is coupled to the use of a potentiostatic double-pulse technique, and current transient data were obtained for the alloys in 1 M HAc/1 M NaAc (Ac = acetate) with 15 ppm AS2O3. In all cases, the anodic charge can be analyzed as a function of charging time in terms of an interfacial control model in which the rate of H ingress into the metal is determined by the flux across the metal surface. The 4340 steel was tested at yield strengths of approximately 175 and 250 ksi. The rate constant for irreversible trapping, k, was evaluated from the measured or apparent rate constant, ka, by estimating the effect of reversible traps from diffusivity data and was found to be 4/s for both 4340 specimens. Keywords: Steel; Monel; Hydrogen; Ingress; Models; Diffusion; Trappping; High strength; Alloys; Hydrogen embrittlement.

The Resistance of High-Strength Alloys to Hydrogen Embrittlement

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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.

Scientific and Technical Aerospace Reports

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Total Pages : 376 pages
Book Rating : 4.:/5 (3 download)

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Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 376 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.

Use of Services for Family Planning and Infertility, United States, 1982

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ISBN 13 : 9780840602220
Total Pages : 982 pages
Book Rating : 4.6/5 (22 download)

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Book Synopsis Use of Services for Family Planning and Infertility, United States, 1982 by : Gerry E. Hendershot

Download or read book Use of Services for Family Planning and Infertility, United States, 1982 written by Gerry E. Hendershot and published by . This book was released on 1988 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1982 statistics on the use of family planning and infertility services presented in this report are preliminary results from Cycle III of the National Survey of Family Growth (NSFG), conducted by the National Center for Health Statistics. Data were collected through personal interviews with a multistage area probability sample of 7969 women aged 15-44. A detailed series of questions was asked to obtain relatively complete estimates of the extent and type of family planning services received. Statistics on family planning services are limited to women who were able to conceive 3 years before the interview date. Overall, 79% of currently mrried nonsterile women reported using some type of family planning service during the previous 3 years. There were no statistically significant differences between white (79%), black (75%) or Hispanic (77%) wives, or between the 2 income groups. The 1982 survey questions were more comprehensive than those of earlier cycles of the survey. The annual rate of visits for family planning services in 1982 was 1077 visits /1000 women. Teenagers had the highest annual visit rate (1581/1000) of any age group for all sources of family planning services combined. Visit rates declined sharply with age from 1447 at ages 15-24 to 479 at ages 35-44. Similar declines with age also were found in the visit rates for white and black women separately. Nevertheless, the annual visit rate for black women (1334/1000) was significantly higher than that for white women (1033). The highest overall visit rate was for black women 15-19 years of age (1867/1000). Nearly 2/3 of all family planning visits were to private medical sources. Teenagers of all races had higher family planning service visit rates to clinics than to private medical sources, as did black women age 15-24. White women age 20 and older had higher visit rates to private medical services than to clinics. Never married women had higher visit rates to clinics than currently or formerly married women. Data were also collected in 1982 on use of medical services for infertility by women who had difficulty in conceiving or carrying a pregnancy to term. About 1 million ever married women had 1 or more infertility visits in the 12 months before the interview. During the 3 years before interview, about 1.9 million women had infertility visits. For all ever married women, as well as for white and black women separately, infertility services were more likely to be secured from private medical sources than from clinics. The survey design, reliability of the estimates and the terms used are explained in the technical notes.

Corrosion

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ISBN 13 :
Total Pages : 574 pages
Book Rating : 4.X/5 (1 download)

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Download or read book Corrosion written by and published by . This book was released on 1989 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues include special section called Corrosion abstracts.

Government Reports Announcements & Index

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ISBN 13 :
Total Pages : 1586 pages
Book Rating : 4.E/5 ( download)

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Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1994-02 with total page 1586 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Comparative Analysis of Hydrogen Diffusion and Trapping Models and Experiments in Metals

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ISBN 13 :
Total Pages : 98 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Comparative Analysis of Hydrogen Diffusion and Trapping Models and Experiments in Metals by : Dariush G. Adli

Download or read book Comparative Analysis of Hydrogen Diffusion and Trapping Models and Experiments in Metals written by Dariush G. Adli and published by . This book was released on 1978 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Metals Abstracts

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Total Pages : 810 pages
Book Rating : 4.E/5 ( download)

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Download or read book Metals Abstracts written by and published by . This book was released on 1995 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Characterization of Hydrogen Ingress in High-Strength Alloys

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ISBN 13 :
Total Pages : 107 pages
Book Rating : 4.:/5 (227 download)

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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.

Modern Aspects of Electrochemistry

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ISBN 13 :
Total Pages : 344 pages
Book Rating : 4.3/5 (957 download)

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Book Synopsis Modern Aspects of Electrochemistry by : John O'M. Bockris

Download or read book Modern Aspects of Electrochemistry written by John O'M. Bockris and published by . This book was released on 1993 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Government reports annual index

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Total Pages : 1828 pages
Book Rating : 4.3/5 (129 download)

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Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1828 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effect of Surface Modification, Microstructure, and Trapping on Hydrogen Diffusion Coefficients in High Strength Alloys

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Total Pages : 374 pages
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Book Synopsis Effect of Surface Modification, Microstructure, and Trapping on Hydrogen Diffusion Coefficients in High Strength Alloys by :

Download or read book Effect of Surface Modification, Microstructure, and Trapping on Hydrogen Diffusion Coefficients in High Strength Alloys written by and published by . This book was released on 2015 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Alloys Index

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Total Pages : 1040 pages
Book Rating : 4.3/5 (91 download)

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Download or read book Alloys Index written by and published by . This book was released on 1990 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Materials World

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ISBN 13 :
Total Pages : 720 pages
Book Rating : 4.3/5 (91 download)

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Download or read book Materials World written by and published by . This book was released on 1994 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Hydrogen Ingress, Diffusion and Trapping in Structural Steel

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Total Pages : 14 pages
Book Rating : 4.:/5 (152 download)

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Book Synopsis Hydrogen Ingress, Diffusion and Trapping in Structural Steel by : Graham Allen Wright

Download or read book Hydrogen Ingress, Diffusion and Trapping in Structural Steel written by Graham Allen Wright and published by . This book was released on 1982 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Hydrogen Ingress, Diffusion, and Trapping in Steel Membranes

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Total Pages : 50 pages
Book Rating : 4.:/5 (152 download)

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Download or read book Hydrogen Ingress, Diffusion, and Trapping in Steel Membranes written by and published by . This book was released on 1986 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: