Effect of Process Parameters on the Microstructures and Mechanical Properties of Iso-Thermally Treated Ductile Iron PDF Download
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Author: P. Atanda
Publisher:
ISBN:
Category : Ductile iron
Languages : en
Pages : 11
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Book Description
The effect of process parameters on the mechanical properties of iso-thermally treated ductile irons was investigated in this study. Sets of ductile irons produced by sandwich method from a rotary furnace melt were given iso-thermal austempering treatments using commercial neutral salt baths. The samples were preheated at 350°C and held for 1 h in a muffle furnace, followed by ausenitizing in an ausenitizing salt bath furnace containing a mixture of BaCl2 and NaCI, (in the ratio 3:2) at 900°C and soaking at that temperature for 1 h. The samples were immediately transferred to the austempering salt bath furnace containing a mixture of NaNO3 and KNO2 in the ratio 1:1. Sets of the samples were soaked at 300°C for between 5 to 240 min and were all later cooled in air. The austempering procedure was repeated at 350 and 400°C for a second and third groups of samples, respectively. The results showed that austempering at lower temperature (300°C) produced a relatively high tensile strength of 1400 MPa, after 150 min holding compared with austempering at the higher temperature (400°C) which produced a relatively lower strength of 1200 MPa at the same holding time. However, the optimal processing window for the austempering was established to be the intermediate temperature of 350°C after a holding time of 150 min. At this processing window, austempering yielded the optimum combination of mechanical properties of 1502 MPa UTS, 7.5 % elongation, and impact energy of 108 J. These properties correspond to a microstructure consisting of a plate-like morphology of ausferrite and retained austenite.
Author: P. Atanda
Publisher:
ISBN:
Category : Ductile iron
Languages : en
Pages : 11
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Book Description
The effect of process parameters on the mechanical properties of iso-thermally treated ductile irons was investigated in this study. Sets of ductile irons produced by sandwich method from a rotary furnace melt were given iso-thermal austempering treatments using commercial neutral salt baths. The samples were preheated at 350°C and held for 1 h in a muffle furnace, followed by ausenitizing in an ausenitizing salt bath furnace containing a mixture of BaCl2 and NaCI, (in the ratio 3:2) at 900°C and soaking at that temperature for 1 h. The samples were immediately transferred to the austempering salt bath furnace containing a mixture of NaNO3 and KNO2 in the ratio 1:1. Sets of the samples were soaked at 300°C for between 5 to 240 min and were all later cooled in air. The austempering procedure was repeated at 350 and 400°C for a second and third groups of samples, respectively. The results showed that austempering at lower temperature (300°C) produced a relatively high tensile strength of 1400 MPa, after 150 min holding compared with austempering at the higher temperature (400°C) which produced a relatively lower strength of 1200 MPa at the same holding time. However, the optimal processing window for the austempering was established to be the intermediate temperature of 350°C after a holding time of 150 min. At this processing window, austempering yielded the optimum combination of mechanical properties of 1502 MPa UTS, 7.5 % elongation, and impact energy of 108 J. These properties correspond to a microstructure consisting of a plate-like morphology of ausferrite and retained austenite.
Author:
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ISBN:
Category : Metallurgy
Languages : en
Pages : 782
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1346
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Author: Mohammad Jawaid
Publisher: Woodhead Publishing
ISBN: 0081023006
Category : Technology & Engineering
Languages : en
Pages : 480
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Book Description
Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites covers key aspects of fracture and failure in natural/synthetic fiber reinforced polymer based composite materials, ranging from crack propagation, to crack growth, and from notch-size effect, to damage-tolerant design. Topics of interest include mechanical properties, such as tensile, flexural, compression, shear, impact, fracture toughness, low and high velocity impact, and anti-ballistic properties of natural fiber, synthetic fibers and hybrid composites materials. It also covers physical properties, such as density, water absorption, thickness swelling, and void content of composite materials fabricated from natural or synthetic materials. Written by leading experts in the field, and covering composite materials developed from different natural fibers and their hybridization with synthetic fibers, the book's chapters provide cutting-edge, up-to-date research on the characterization, analysis and modelling of composite materials. - Contains contributions from leading experts in the field - Discusses recent progress on failure analysis, SHM, durability, life prediction and the modelling of damage in natural fiber-based composite materials - Covers experimental, analytical and numerical analysis - Provides detailed and comprehensive information on mechanical properties, testing methods and modelling techniques
Author: Joseph R. Davis
Publisher: ASM International
ISBN: 9780871705457
Category : Technology & Engineering
Languages : en
Pages : 518
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Book Description
If you are involved with machining or metalworking or you specify materials for industrial components, this book is an absolute must. It gives you detailed and comprehensive information about the selection, processing, and properties of materials for machining and metalworking applications. They include wrought and powder metallurgy tool steels, cobalt base alloys, cemented carbides, cermets, ceramics, and ultra-hard materials. You'll find specific guidelines for optimizing machining productivity through the proper selection of cutting tool materials plus expanded coverage on the use of coatings to extend cutting tool and die life. There is also valuable information on alternative heat treatments for improving the toughness of tool and die steels. All new material on the correlation of heat treatment microstructures and properties of tool steels is supplemented with dozens of photomicrographs. Information on special tooling considerations for demanding applications such as isothermal forging, die casting of metal matrix composites, and molding of corrosive plastics is also included. And you'll learn about alternatives to ferrous materials for metalworking applications such as carbides, cermets, ceramics, and nonferrous metals like aluminum, nickel, and copper base alloys.
Author:
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ISBN:
Category : Metallurgy
Languages : en
Pages : 1622
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Author: Taurista Perdana Syawitri
Publisher: Springer Nature
ISBN: 9464631341
Category : Technology & Engineering
Languages : en
Pages : 633
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Book Description
This is an open access book. MEST2022 invites all potential authors from universities and various organisations to submit papers in the area of mechanical, manufacturing, materials sciences and related interdisciplinary engineering fields. This conference is part of a conference program called International Summit on Science Technology and Humanity (ISETH) 2022 Organized by Universitas Muhammadiyah Surakarta. The 6th Mechanical Engineering, Science and Technology (MEST2022) International conference is an annual the Mechanical Department of Universitas Muhammadiyah Surakarta event. All possible writers from universities and other organizations are invited to submit papers. The conference is a forum for academic exchange that provides a prompt presentation of articles on experimental, numerical, and theoretical studies that shed light on the critical topics of mechanical, thermal, fluid, and aerothermodynamics internal flow, heat and mass transfer, multiphase flow, turbulence modelling, combustion, engineering thermodynamics, thermophysical properties of matter, measurement, and visualization techniques. Contributions range from intriguing and significant research immediately applicable to industry development or practice to high-level student textbooks, explanations, distribution of technology, and good practice.
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Category :
Languages : en
Pages : 12
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Thermo-mechanical processing of ductile irons is a potential method for enhancing their mechanical properties. A ductile cast iron containing 3.6% C, 2.6% Si and 0.045% Mg was continuously hot-and-warm rolled or one-step press-forged from a temperature in the austenite range (900°C-1100°C) to a temperature below the A, temperature. Various amounts of reduction were used (from 60% to more than 90%) followed by a short heat ent at 600'C. The heat ent lead to a structure of fine graphite in a matrix of ferrite and carbides. The hot-and- warm worked materials developed a pearlitic microstructure while the press-forged material developed a spheroidite-like carbide microstructure in the matrix. Cementite-denuded ferrite zones were developed around graphite stringers in the hot-and-warm worked materials, but such zones were absent in the press-forged material. Tensile properties including tensile strength and total elongation were measured along the direction parallel and transverse to the rolling direction and along the direction transverse to the press-forging direction. The tensile ductility and strength both increased with a decrease in the amount of hot-and-warm working. The press- forged materials showed higher strength (645 MPa) than the hot-and-warrn worked materials (575 MPa) when compared at the same ductility level (22% elongation).
Author: Karl-Heinrich Grote
Publisher: Springer Science & Business Media
ISBN: 3540491317
Category : Science
Languages : en
Pages : 1588
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Book Description
This resource covers all areas of interest for the practicing engineer as well as for the student at various levels and educational institutions. It features the work of authors from all over the world who have contributed their expertise and support the globally working engineer in finding a solution for today‘s mechanical engineering problems. Each subject is discussed in detail and supported by numerous figures and tables.
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ISBN:
Category : Aeronautics
Languages : en
Pages : 974
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