Effect of the Rate of Deformation on Strength of Carbon Steel at High Temperatures PDF Download
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Author: Mark Alekseevich Zaĭkov
Publisher:
ISBN:
Category : Carbon steel
Languages : en
Pages : 32
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Book Description
Author: Mark Alekseevich Zaĭkov
Publisher:
ISBN:
Category : Carbon steel
Languages : en
Pages : 32
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Book Description
Author: Herbert James French
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 56
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Author: Herbert James French
Publisher: Forgotten Books
ISBN: 9781333429256
Category : Technology & Engineering
Languages : en
Pages : 62
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Book Description
Excerpt from Effect of Temperature, Deformation, and Rate of Loading on the Tensile Properties of Low-Carbon Steel Below the Thermal Critical Range It has long been known that increase in temperature above the ordinary atmospheric range (is accompanied by changes in steels, particularly in strength and ductility. A large number of interesting and important papers dealing with 'various phases of this subject have appeared from time to time, but as recently pointed out by Jeffries (3 4) 2 our knowledge is still unsatisfactory, and a better understanding of these changes will undoubtedly be of benefit to industry. White (35) is of the opinion that our knowledge of the tensile properties of steels at high temperatures is wholly inadequate and has not kept pace with advancement of knowledge in other branches of engineering, while Howe (38) long ago called attention to the apparent anomalies found in study ing the effects of work at temperatures under the thermal trans formations ou the properties of wrought iron and steel used in boiler construction. Certainly, from the standpoint of engineering design, it is important to know the variations in limit of propor tionality with changes in temperature, but unfortunately this is the more difficult to determine of those factors considered in tensile tests, and the data available are con icting. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
Author: H. Abdel-Raouf
Publisher:
ISBN:
Category : Aging (metallurgy)
Languages : en
Pages : 30
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Book Description
Cyclic deformation behavior and fracture mechanisms of Ferrovac E iron under low cycle fatigue conditions are studied at temperatures ranging from 23 to 540 C, cyclic deformation rates from 4 x 10-4 to 2 x 10-1 s-1, and strain ranges from 0.010 to 0.040. The stress response during strain cycling shows three stages, primary hardening, steady state behavior, and secondary hardening. Both the onset and duration of secondary hardening are dependent on deformation rate and temperature through the process of dynamic strain aging. Stress response sensitivity to deformation rate increases under conditions which permit changes in both internal and effective stress components. There is a variation in the internal stress component at the blue brittleness temperature (370 C) caused by an increase in total dislocation density due to dynamic strain aging. However, at higher temperatures (485 to 540 C) a variation in the internal stress component is caused by accelerated thermal recovery. Steady state cyclic deformation in this temperature range is observed to be consistent with models for steady state creep and hot-working. The fracture mechanism and fatigue life are mainly influenced by the characteristics of stress and strain redistribution and the inhomogeneity of plastic-strains. This inhomogeneity of deformation results from dynamic strain aging effects during fatigue. A parameter which controls stress response, fatigue behavior, and fracture mode under dynamic strain aging conditions is presented.
Author: Guy Versé
Publisher:
ISBN:
Category : Elasticity
Languages : en
Pages : 8
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Author: John G. Lenard
Publisher: Springer Science & Business Media
ISBN: 3642525156
Category : Technology & Engineering
Languages : en
Pages : 154
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Book Description
Computer Aided Engineering may be defined as an approach to solving tech nological problems in which most or all of the steps involved are automated through the use of computers, data bases and mathematical models. The success of this ap proach, considering hot forming, is tied very directly to an understanding of material behaviour when subjected to deformation at high temperatures. There is general agreement among engineers that not enough is known about that topic -and this gave the initial impetus for the project described in the present study. The authors secured a research grant from NATO (Special Research Grant #390/83) with a mandate to study the "State-of-the-Art of Controlled Rolling". What follows is the result of that study. There are five chapters in this Monograph. The first one, entitled "State-of-the Art of Controlled Rolling" discusses industrial and laboratory practices and research designed to aid in the development of microalloyed steels of superior quality. Follow ing this is the chapter "Methods of Determining Stress-Strain Curves at Elevated Temperatures". The central concern here is the material's resistance to deformation or in other words, its flow strength, the knowledge of which is absolutely essential for the efficient and economical utilization of the computers controlling the rolling process.
Author: Y. Asada
Publisher:
ISBN:
Category : Carbon steel
Languages : en
Pages : 16
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Book Description
In high temperature waters that contain dissolved oxygen (DO) to certain content, the fatigue life of carbon steel is strongly affected by strain rate. A formula has been advanced to quantify this effect when the strain rate is held constant. However, the strain rate changes continuously in most of transients of actual plant operation. There is no way currently to assess the effects of strain rate when the strain rate is varied as in the actual plant transients. To find a solution to this problem, a series of strain controlled fatigue tests have been conducted with the strain rate changed stepwise or continuously. It is shown that a method, in which the product of the environmental effect and the strain increment within a unit time interval in a transient period is integrated from the minimum strain to the maximum, evaluates the environmental effect with satisfactorily high accuracy. This method is called the modified rate approach method. It is shown also that the procedure of taking the strain rate as averaged over the minimum to peak of the strain change as giving rise to more conservative evaluations than the ones the modified rate approach method produces.
Author: Herbert J. (Herbert James) 1893 French
Publisher: Wentworth Press
ISBN: 9781361992586
Category : History
Languages : en
Pages : 62
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Book Description
This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Author: A. H. Cottrell
Publisher:
ISBN:
Category : Dislocations in crystals
Languages : en
Pages : 223
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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The stress-strain rate relations in ultrahigh carbon steels (UHCSs) have been analyzed at high temperatures in the ferrite range where dislocation slip is the principal deformation mechanism. Specifically, the present investigation centers on the factors influencing the strength of UHCS in the ferrite range of 500 to 700 C and in the strain rate range of 10−3 to 103 s−1. These steels contain iron carbide as a second phase either in the form of spheroidite or pearlite and vary in the grain size according to the processing history. The new variables that need to be taken into account are the effect of ferromagnetism and its change with temperature on the creep strength of the ferritic UHCSs. Recent studies have shown that ferromagnetism strongly influences the lattice and dislocation pipe diffusion coefficient and the elastic modulus of iron in the ferrite range of temperature. These variables are shown to influence the creep strength of ferrite-base steels and explain the high activation energies that are observed in many of the ferritic UHCSs.
