Download or read book Assessing the Quality of As received 4340 Steel for the Production of NIST Charpy Reference Specimens written by Enrico Lucon and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Charpy Machine Verification Program at NIST in Boulder uses heat-treated 4340 steel for the production of indirect verification Charpy specimens at low- and high-energy level. Recently, a batch of steel purchased for the program turned out to be unacceptably inhomogeneous, causing several NIST Contractors to produce specimen lots that did not fulfil our variability requirements, despite repeated attempts at modifying the heat-treatment process. The whole batch of steel had to be eventually scraped. In order to avoid such an occurrence in the future and develop an investigation procedure that can detect variability issues in the acceptance phase of newly purchased batches of 4340 steel, we have performed the following investigations and measurements on samples from good and bad heats: hardness measurements (Rockwell C and Vickers), instrumented Charpy tests, optical investigations, and texture analyses (including grain size measurements). Of all the parameters considered, we found that grain size can clearly differentiate between acceptable (30 m 40 m) and unacceptable (60 m 70 m) heats, and should therefore become the basis of future heat quality assessments. In support, hardness measurements can also be performed, while Charpy tests are not recommended in view of their relative experimental and economic burden.
Download or read book Pendulum Impact Testing written by T. A. Siewert and published by ASTM International. This book was released on 2000 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Comparative Analysis of NIST Charpy Machines and Internal Reference Materials written by Enrico Lucon and published by . This book was released on with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the results of a series of comparative analyses which were conducted on the Charpy machines located at NIST in Boulder, Colorado. The analyses were performed both on historical data, collected over a period of more than 20 years, and newly obtained test results from almost 300 instrumented and non-instrumented impact tests on verification specimens of low energy (13 J to 20 J), high energy (88 J to 136 J), and super-high energy (176 J to 244 J). The comparative analyses were completed for the purpose of understanding the limits of calibrating instrumented strikers for use in dynamic test through conventional static calibration procedures. Test results, obtained both in the past and within the current study, show that one of the so-called master machines (used to establish reference values for ASTM verification specimens) delivers consistently lower energy values than the other two master machines in the 15 J - 20 J range. This is suspected to be due to its higher stiffness and hammer design (C-type), which increases its natural frequency of vibration and causes early fracture in a quasi-brittle (low-energy) test. The extremely large number of instrumented Charpy tests performed within this investigation (more than 200) allowed us to assess the reliability of the conventional static calibration procedure for our instrumented strikers, as compared to different approaches for the adjustment/correction of measured force values. Even though these approaches were found beneficial in improving the between-machine consistency, statistically significant differences remained nonetheless. It appears that, in order to reliably calibrate an instrumented striker, forces must be applied at loading rates that are equivalent to those encountered during actual tests (dynamic calibration of instrumented strikers). This should become a clear objective of the NIST Charpy program going forward.
Download or read book Impact Characterization of 4340 and T200 Steels by Means of Standard Sub size and Miniaturized Charpy Specimens written by Enrico Lucon and published by . This book was released on 2015 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charpy Verification Program written by C. N. MacCowan and published by National Institute of Standards & Technology. This book was released on 2004-04-01 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a compendium of various studies by NIST on Charpy impact test procedure and specimen preparation variables. Includes sections on: Overview and History; Materials and Heat Treatment; Specimen, Machine, and Procedure Effects; and Statistical Evaluations of Charpy Impact Data.
Download or read book European Certification of Charpy Specimens written by R. Varma and published by . This book was released on 2000 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The procedure for the production and certification of BCR (Bureau Communautaire de Reference) Charpy specimens for machine verification according to the European standard EN 10045-2 is described. A master batch is initially certified by interlaboratory comparison and is then used as a reference to certify sub-batches of similar impact toughness by comparative measurements on one dedicated machine. Extensive testing over ten years has shown that, for SAE 4340 steel, a 2 mm striker generally produces higher impact toughness than an 8 mm striker up to 120 J absorbed energy. Another observation is that asymmetric fracture generally occurs in about 50% of all cases, but that small series of tests may produce nearly all symmetric or nearly all asymmetric failures, influencing the mean value of the measured impact toughness.
Download or read book Reverse Engineering written by Wego Wang and published by CRC Press. This book was released on 2010-09-16 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: The process of reverse engineering has proven infinitely useful for analyzing Original Equipment Manufacturer (OEM) components to duplicate or repair them, or simply improve on their design. A guidebook to the rapid-fire changes in this area, Reverse Engineering: Technology of Reinvention introduces the fundamental principles, advanced methodologie
Download or read book Charpy Impact Tests of 4340 Steel and 6Al 6V 2Sn Titanium Alloy Using Standard and Thin Charpy Specimens written by Armando A. Iannelli and published by . This book was released on 1962 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Handbook written by François Cardarelli and published by Springer Science & Business Media. This book was released on 2008-03-19 with total page 1365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique and practical book provides quick and easy access to data on the physical and chemical properties of all classes of materials. The second edition has been much expanded to include whole new families of materials while many of the existing families are broadened and refined with new material and up-to-date information. Particular emphasis is placed on the properties of common industrial materials in each class. Detailed appendices provide additional information, and careful indexing and a tabular format make the data quickly accessible. This book is an essential tool for any practitioner or academic working in materials or in engineering.
Download or read book Advances in Materials and Metallurgy written by A. K. Lakshminarayanan and published by Springer. This book was released on 2018-09-01 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents select proceedings of the International Conference on Engineering Materials, Metallurgy and Manufacturing (ICEMMM 2018), and covers topics regarding both the characterization of materials and their applications across engineering domains. It addresses standard materials such as metals, polymers and composites, as well as nano-, bio- and smart materials. In closing, the book explores energy, the environment and green processes as related to materials engineering. Given its content, it will prove valuable to a broad readership of students, researchers, and professionals alike.
Download or read book Metals Abstracts written by and published by . This book was released on 1995 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanical Properties of Structural Materials at Low Temperatures written by Ralph Michael McClintock and published by . This book was released on 1960 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Small Specimen Test Techniques written by W. R. Corwin and published by ASTM International. This book was released on 1998 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of an increasing interest in radiation embrittlement for aging nuclear reactors, scientists gathered in New Orleans in January 1997 to consider the interests and capabilities of the scientific-testing community and of the commercial light-water-cooled power-reactor industry in terms of improving methods to characterize component integrity. The resulting 37 papers concentrate on the use of unique small and miniature specimens; nondestructive, nonintrusive, and in- situ test techniques for measuring mechanical and fracture properties; the application of tests to irradiation-induced embrittlement; and actual examples of tests to determine material integrity and to evaluate potential component life extension. They consider experimental, analytical, and computational aspects. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Standard Handbook of Machine Design written by Joseph Edward Shigley and published by McGraw-Hill Professional Publishing. This book was released on 1996 with total page 1672 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest ideas in machine analysis and design have led to a major revision of the field's leading handbook. New chapters cover ergonomics, safety, and computer-aided design, with revised information on numerical methods, belt devices, statistics, standards, and codes and regulations. Key features include: *new material on ergonomics, safety, and computer-aided design; *practical reference data that helps machines designers solve common problems--with a minimum of theory. *current CAS/CAM applications, other machine computational aids, and robotic applications in machine design. This definitive machine design handbook for product designers, project engineers, design engineers, and manufacturing engineers covers every aspect of machine construction and operations. Voluminous and heavily illustrated, it discusses standards, codes and regulations; wear; solid materials, seals; flywheels; power screws; threaded fasteners; springs; lubrication; gaskets; coupling; belt drive; gears; shafting; vibration and control; linkage; and corrosion.
Download or read book Influence of Side groove Depth and Heat Treatment on Super high Energy Charpy Specimens of 9310 Steel written by Enrico Lucon and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: NIST provides certified reference Charpy specimens to companies and laboratories around the world for the indirect verification of impact machines in accordance with ASTM E23. Specimens are available at three energy levels, low (?15 J at 40 ?C), high (?100 J at -40 ?C), and super-high (?200 J at room temperature). Specimens of this latter energy level have been out of stock from the late 2000s until the late 2010s, when specimens of AISI 9310 steel were found to be suitable for standardization, provided they were side-grooved in order to prevent the formation of shear lips. This study was aimed at establishing an optimal combination of heat treatment (specifically, final tempering temperature) and side-groove depth for Charpy specimens of 9310 steel, and was conducted by testing almost 900 specimens corresponding to six different combinations. As a result of this study, a recommendation for the heat treatment and side-groove depth of future super-high energy specimen lots was formulated.
Download or read book Commerce Business Daily written by and published by . This book was released on 1998-10 with total page 1996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Techniques in Materials and Mechanics written by C. Suryanarayana and published by CRC Press. This book was released on 2011-06-27 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental Techniques in Materials and Mechanics provides a detailed yet easy-to-follow treatment of various techniques useful for characterizing the structure and mechanical properties of materials. With an emphasis on techniques most commonly used in laboratories, the book enables students to understand practical aspects of the methods and derive the maximum possible information from the experimental results obtained. The text focuses on crystal structure determination, optical and scanning electron microscopy, phase diagrams and heat treatment, and different types of mechanical testing methods. Each chapter follows a similar format: Discusses the importance of each technique Presents the necessary theoretical and background details Clarifies concepts with numerous worked-out examples Provides a detailed description of the experiment to be conducted and how the data could be tabulated and interpreted Includes a large number of illustrations, figures, and micrographs Contains a wealth of exercises and references for further reading Bridging the gap between lecture and lab, this text gives students hands-on experience using mechanical engineering and materials science/engineering techniques for determining the structure and properties of materials. After completing the book, students will be able to confidently perform experiments in the lab and extract valuable data from the experimental results.
