Download or read book Influence of Density and Porosity Size and Shape on Fatigue and Fracture Toughness of High Strength FL4405 P M Steel written by RI. Stephens and published by . This book was released on 1998 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Density and sintering temperature effects were investigated with FL4405 low alloy P/M high strength steel. Monotonic tensile stress-strain, plane strain fracture toughness and fatigue behavior of smooth, notched and cracked specimens were investigated under both constant and variable amplitude loading. Two density levels, 7.0 and 7.4 g/cm3 and two sintering temperatures, 1120 and 1315‡C, were evaluated. The increased density resulted in smaller pore size and pore volume and the increased sintering temperature resulted in greater pore roundness. All final fracture surfaces were brittle at the macro level while containing ductile dimples at the micro level. Fatigue surfaces contained cleavage only, ductile dimples only or mixed cleavage and ductile dimple morphology with no striations nor beachmarks. Increasing the density resulted in significant higher tensile strength, elastic modulus, ductility, fracture toughness and fatigue resistance. Increasing the sintering temperature, and hence increasing pore roundness, resulted in additional enhancement of these properties. However, this increase was not as significant as that of the density increase.
Download or read book The Influence of Pore Size and Shape on Smooth and Notched Variable Amplitude Fatigue Behavior of FL4405 High Strength Powder Metal Steel Alloy written by Dente Duncan Poland and published by . This book was released on 1997 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Fracture Toughness Mechanism in Ultra fine grained Steels written by Toshihiro Hanamura and published by Springer. This book was released on 2014-09-04 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, advanced steel technologies mainly developed at the National Institute for Materials Science (NIMS), Japan, for structure control, mechanical properties, and the related mechanisms are introduced and discussed. NIMS has long worked on developing advanced steel techniques, namely, producing advanced steels by using only simple alloying elements such as carbon, manganese, and silicon, and also by utilizing steel scrap. The hope is that this approach will lead to a technology of a so-called steel-to-steel recycling process, with the ultimate goal of a recycling process such as an automotive-steel-to-automotive-steel recycling process to take the place of the current cascade-type recycling system. The main idea is to utilize ultra-grain refining structures and hetero structures as well as martensite structures. In particular, the focus of this book is on tensile strength and toughness of advanced steels from both the fundamental and engineering points of view. Fundamentally, a unique approach to analysis is taken, based on fracture surface energy as effective grain size is employed to better understand the mechanism of property improvement. From the engineering point of view, in fracture toughness such factors as crack tip opening displacement (CTOD) of advanced steels are evaluated in comparison with those of conventional steels.
Download or read book Influence of Work Hardening Exponent on Crack Propagation in High strength Materials written by G. L. Hanna and published by . This book was released on 1966 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of work hardening exponent on the variation of fracture toughness with material thickness was studied for high strength steel, aluminum, and titanium alloys. A variety of materials could be compared by employing normalizing parameters to represent the toughness in terms of the relative plastic zone size and representing the relationship on a logarithmic plot. Using this method the normalized fracture toughness parameter in the region of 100% slant fracture was proportional to the square of the work hardening exponent for the body-centered cubic metals. In the fracture mode transition region, however low work hardening was beneficial and the thickness at which the transition occurred decreased as the work hardening exponent increased. The influence of work hardening exponent on cyclically-induced crack growth rates in AISI 4340 steel and 13V-11Cr-3A1 titanium was also evaluated. In the steel the growth rate was slightly less for the material with the lower work hardening exponent while the titanium exhibited so significant trend as a function of work hardening characteristics. The specimen thickness had the greatest effect on the cyclically-induced crack growth with decreased growth rates present in the thicker specimens. Attempts were also made to control the process zone size by adding zirconia particles to a high strength steel matrix through powder metallurgy techniques.
Download or read book Fatigue and fracture Toughness cryogenic behavior written by C. F. Hickey and published by ASTM International. This book was released on 1974 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Toughness of High strength Materials Theory and Practice written by and published by . This book was released on 1970 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Influence of Crack Length and Thickness in Plane Strain Fracture Toughness Tests written by Melvin H. Jones and published by . This book was released on 1969 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Toughness of High strength Steels for Military Applications written by J. E. Campbell and published by . This book was released on 1968 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Memorandum discusses the current situation on the inclusion of fracture-toughness testing requirements in specifications for high-strength steels used for military applications. The Memorandum was prepared at the request of The Technical Cooperation Program (TTCP), and contains information from Canadian and British members of that program, as well as U.S. information. Military applications discussed include missile motor cases, aircraft landing gear, gun tubes, armor plate, and hydrofoils. (Author).
Download or read book Metals Abstracts written by and published by . This book was released on 1999 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Properties Related to Fracture Toughness written by and published by ASTM International. This book was released on 1976 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Toughness Testing and Its Applications written by ASTM Committee E-24 Staff and published by ASTM International. This book was released on 1981-10 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Toughness Testing and Its Applications written by and published by ASTM International. This book was released on 1965 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Properties Related to Fracture Toughness written by and published by ASTM International. This book was released on 1976 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metallurgical Variables Affecting Fracture Toughness in High strength Sheet Alloys written by Carl E. Hartbower and published by . This book was released on 1963 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using precracked Charpy tests supplemented by center-notched tensile tests, the fracture toughness of five low-alloy and three stainless steel high-strength alloys in sheet form was measured primarily as a function of heat treatment variables such as austenitizing and tempering temperatures. The low alloy steels studied were D6AC (two heats)4340 (martensitic and bainitic conditions), X200 (0.35 and 0.40% carbon), 300M and H11; and the stainless steels were AM 355, PH 15-7Mo and 301. For 4340, in the bainitic condition, the influence of subsequent deformation and aging on fracture toughness was also determined. In addition, preliminary studies of the effect of welding both before and after heat treatment on the toughness of H11, 300M and 4340 were carried out. (Author).
Download or read book Fatigue and Fracture Characteristics of High Hardness Laminar Composite Steel written by R. Chait and published by . This book was released on 1974 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the present paper is to characterize static and dynamic mechanical properties of high-hardness laminar composite steel. Tensile, compressive, and shear properties were obtained. Fatigue properties were also investigated including the effect of minimum: maximum stress (R) ratio, humidity, and surface condition. Improving the as-received surface led to increased values of the fatigue limit. Fatigue resistance was lowered markedly by humidity. For a given value of maximum stress increasing the R ratio increased the number of cycles to failure. Orientation had a pronounced effect on the toughness of cracked and uncracked Charpy specimens, that is, RW orientation exhibited greater toughness than did WR. There is some evidence to indicate that constraint has caused the hard-soft interfacial bond to delaminate. Lastly, examination of the fracture surfaces of the tensile, fatigue, and Charpy specimens revealed that in most instances crack initiation phase of fracture takes place on the hard side of the composite.
Download or read book The Relationship of Microstructure to Strength and Toughness in High strength Steel written by John Henry Bucher and published by . This book was released on 1965 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report deals with the relationship of elements of microstructure to the fracture characteristics of a group of commercially produced steels, heat-treated to ultra-high strength levels. The microstructures were characterized in terms of optical microscopy, electron diffraction, and electron fractography. Fractographic studies were made of fractured surfaces broken in impact at +25 and -196 C as a function of tempering temperature, in slow bending at ambient temperature, in a modified bend test in which slow and fast propagation stages were effected, and on surfaces produced in tensile fractures. The fracture characteristics were studied by means of an instrumented bend test and in terms of the plastic instability generated in the torsion test. The instrumented bend test yielded data on criteria for the onset of slow crack propagation and for the onset of rapid propagation, including the effect of the total stored energy in the system. Plastic instability in torsion was studied as a function of specimen section size in AISI 4340 steel. A 250,000 psi yield strength Maraging steel was studied in a standard size test bar. (Author).
