Author: John Henry Bucher
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 310

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Book Description

Author: John Henry Bucher
Publisher:
ISBN:
Category : Fractography
Languages : en
Pages : 138

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Book Description
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).

Author: Andrey Belyakov
Publisher: MDPI
ISBN: 3038975052
Category : Technology & Engineering
Languages : en
Pages : 272

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Book Description
The papers collected in this special issue clearly reflect the modern research trends in materials science. These fields of specific attention are high-Mn TWIP steels, high-Cr heat resistant steels, aluminum alloys, ultrafine grained materials including those developed by severe plastic deformation, and high-entropy alloys. The major portion of the collected papers is focused on the mechanisms of microstructure evolution and the mechanical properties of metallic materials subjected to various thermo-mechanical, deformation or heat treatments. Another large portion of the studies is aimed on the elaboration of alloying design of advanced steels and alloys. The changes in phase content, transformation and particle precipitation and their effect on the properties are also broadly presented in this collection, including the microstructure/property changes caused by irradiation.

Author: George Joseph Vytanovych
Publisher:
ISBN:
Category : Carbon steel
Languages : en
Pages : 152

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Book Description
"Methods of preparing foils of high strength, heat treated, plain carbon steels for examination in the electron microscope by the transmission technique were perfected and are described. Two processes for the initial thinning of a bulk sample were successful. A chemical process was found to be more rapid but not satisfactory for small samples. A mechanical process was slower, but was applicable to the smaller specimens. Electro-polishing the thinned material yielded acceptable foils from which photomicrographs of good quality were obtained. The microstructure of the high strength steel samples showed typical tempered martensite. No reasons for the differences in ductility of different heats of steel or for the differences in ductility of a given steel, when heat treated differently, were found"--Abstract, leaf ii.'

Author: John Henry Bucher
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 658

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Book Description

Author: A. J. Baker
Publisher:
ISBN:
Category : Chromium
Languages : en
Pages : 27

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Book Description
An investigation was made of a number of 0.30 and 0.40 per cent carbon alloy steels to determine the relationships between their fracture toughness properties and their internal microstructures. The plane-strain fracture toughness of the steels was measured after tempering quenched material in the temperature range 300 to 1100 F. A thin section transmission electron microscopy study was carried out on the tempered materials. From the fracture toughness studies it was concluded that all the materials behaved similarly and that alloying elements (carbon and silicon) had little influence on the general relationship between tensile strength and toughness in these fully hardenable steels. It was found that the fracture toughness remained low at low tempering temperatures but improved rapidly once a critical tempering temperature, characteristic of the particular steel, was reached. The microscopy study showed that major microstructural changes occurred in the tempering range where the rapid increase in toughness was observed. At low tempering temperatures the defect structure of the as-quenched martensite remained unchanged, and continuous films of carbide were formed in the boundaries of the martensite. In the critical tempering range the carbide films were spheroidized and the defect structure of the matrix removed or modified by recovery processes. On the basis of these observations, it was concluded that the low fracture toughness of the steels in a lightly tempered condition was due to their high defect densities and the presence of carbide films at boundaries. Only when these features were removed or modified did toughness increase.

Author: Nina Fonstein
Publisher: Springer
ISBN: 3319191659
Category : Technology & Engineering
Languages : en
Pages : 415

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Book Description
The book covers all types of advanced high strength steels ranging from dual-phase, TRIP. Complex phase, martensitic, TWIP steels to third generation steels, including promising candidates as carbide free bainitic steels, med Mn and Quenching & Partitioning processed steels. The author presents fundamentals of physical metallurgy of key features of structure and relationship of structure constituents with mechanical properties as well as basics of processing AHSS starting from most important features of intercritical heat treatment, with focus on critical phase transformations and influence of alloying and microalloying. This book intends to summarize the existing knowledge to show how it can be utilized for optimization and adaption of steel composition, processing, and for additional improvement of steel properties that should be recommended to engineering personal of steel designers, producers and end users of AHSS as well as to students of colleges and Universities who deal with materials for auto industry.

Author: Madeleine Durand-Charre
Publisher: Springer Science & Business Media
ISBN: 9783540209638
Category : Science
Languages : en
Pages : 422

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Book Description
The book comprises three parts. Part 1 gives a historical description of the development of ironworking techniques since the earliest times. Part 2 is the core of the book and deals with the metallurgical basis of microstructures, with four main themes: phase diagrams, solidification processes, diffusion, and solid state phase transformations. Part 3 begins by an introduction to steel design principles. It then goes on to consider the different categories of steels, placing emphasis on their specific microstructural features. Finally, a comprehensive reference list includes several hundred pertinent articles and books. The book is the work of a single author, thus ensuring uniformity and concision. It is intended for scientists, metallurgical engineers and senior technicians in research and development laboratories, design offices and quality departments, as well as for teachers and students in universities, technical colleges and other higher education establishments.

Author: H.K.D.H. Bhadeshia
Publisher: Elsevier
ISBN: 0080462928
Category : Technology & Engineering
Languages : en
Pages : 357

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Book Description
Steels represent the most widely-used metallic alloy, possessing a wide range of microstructures and mechanical properties. By examining the mechanical properties of steels in conjunction with microstructure this book provides a valuable description of the development and behaviour of these materials - the very foundation of their widespread use. Updated throughout and including new chapters on nanostructured steels, and new alloys and technologies for the energy and automobile industries, the book is clearly written and illustrated, with extensive bibliographies and real-life examples. An essential reference, both compact and readily comprehensive, for metallurgists and engineers in both industry and academia. Covers the microstructure, mechanical behaviour and properties of steels, the most widely-used metallic alloy Thoroughly updated with new materials and technologies Respected author team who bring their wide experience to students and professionals

Author: Huseyin Aydin
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
The evolution of the microstructure, during processing as well as deformation, is characterized by using optical and electron microscopy techniques and mechanical tests. The effect of alloy composition and processing parameters on the deformation mechanisms of these steels is discussed." --