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isothermal temperature coefficient

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Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006850
EISBN: 978-1-62708-395-9
... in elevated temperature at the polymer–polymer interface, leading to melting and rapid wear. Therefore, the focus of this article is on the wear of polymers when slid against metallic surfaces. Interfacial Wear The notion of interfacial wear arises from the two-term model of frictional energy...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
... S.K. , High Temperature Wear of Semi-Metallic Disk Brake Pads , Wear of Materials 1977 , American Society of Mechanical Engineers , 1977 , p 552 – 554 25. Rhee S.K. and Thesier P.A. , “Effects of Surface Roughness of Brake Drums on Coefficient of Friction and Lining Wear...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006924
EISBN: 978-1-62708-395-9
... the a material’s response to temperature. Thermal analysis experiments are commonly conducted by heating the material under investigation at a constant rate, for example, 10 ° C/min (18 ° F/min), but may also be conducted on cooling or while the material is being held isothermally. Differential Scanning...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... term given to the material damage accumulation process that occurs with simultaneous changes in temperature and mechanical loading. During this process, a whole range of damage mechanisms occur, and interactions usually take place that do not take place in isothermal fatigue. The principal challenges...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006932
EISBN: 978-1-62708-395-9
... the glass transition temperature, T g , and the ambient temperature, represent a problem in high-performance (high-temperature) thermoplastics such as polysulfone (PSU) or polyetherketone (PEK) because they develop significant thermal stresses on cooling. It is this coefficient of thermal expansion (CTE...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006923
EISBN: 978-1-62708-395-9
... 31 Styrene-maleic anhydride (S/MA) terpolymer 103 215 80 175 … … … Thermoset resins (neat) Heat-deflection temperature at 1.82 MPa (0.264 ksi) Continuous service temperature Thermal conductivity Coefficient of thermal expansion, 10 −6 /°C °C °F °C °F W/m · K...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... strain range at the lower temperature, and A and δ are experimentally determined parameters. Oxidation proceeds according to the approximate formula: (Eq 2) x = D t where x is penetration distance, D is diffusion coefficient, and t is time to form a microcrack...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
... covered in the article “Elevated-Temperature Life Assessment for Turbine Components, Piping, and Tubing” in this Volume. Bulk Creep Behavior Some of the key material properties at high temperature are thermal expansion coefficient, stress rupture, elastic modulus, fatigue life, and oxidation...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... creep tests under a constant stress instead of a constant load. Each of these early studies on creep revealed a change in the creep response of a material as a function of time. Bulk Creep Behavior Some key material properties at high temperature are thermal expansion coefficient, stress rupture...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... of successful heat treatment is procedure qualification and process controls to ensure proper heating and cooling of a metal during heat treatment. The furnace must be of the proper size and type, and temperatures must be controlled within the prescribed limits for each operation to prevent overheating...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006922
EISBN: 978-1-62708-395-9
... temperature Ball pressure test Coefficient of linear thermal expansion Thermal diffusivity Electrical Volume and surface resistivity Dissipation factor Flammability Burning rate UL 94 flammability rating Glow wire ignition temperature Molding Ejection temperature...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... for select alloys in continuous, isothermal oxidizing atmospheres without excessive scaling Table 1 Suggested maximum operating temperatures for select alloys in continuous, isothermal oxidizing atmospheres without excessive scaling Alloy designation Maximum temperature Ref °C °F...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001712
EISBN: 978-1-62708-234-1
... using chromel wire and placed in a pre-calibrated isothermal section of the furnace. The samples were subjected to the flowing nitrogen atmosphere for varying lengths of time at a constant temperature of 1000 +/− 5 °C. Upon removal from the apparatus, the samples were weighed and measured...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006916
EISBN: 978-1-62708-395-9
... attack, and coefficient of thermal expansion difference between plastic and metal. However, if the metal inserts are not preheated to the same temperature as that of the mold before they are loaded into the mold, the hot melt will surround the cold insert and create residual stresses around the inserts...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... Abstract This article focuses on the life assessment methods for elevated-temperature failure mechanisms and metallurgical instabilities that reduce life or cause loss of function or operating time of high-temperature components, namely, gas turbine blade, and power plant piping and tubing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003510
EISBN: 978-1-62708-180-1
...-temperature-transformation diagrams, also called isothermal transformation diagrams, are developed by heating small samples of steel to the temperature where austenite transformation structure is completely formed, that is, the austenitizing temperature (T A ), and then rapidly cooling to a temperature...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006909
EISBN: 978-1-62708-395-9
...). There is no observable change in mass below the threshold temperature. Most polymers degrade or melt at approximately 200 °C (390 °F), although there are several polymers that can withstand temperatures well above 200 °C in inert gas environments. Isothermal or static thermogravimetry can be used to characterize thermal...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003538
EISBN: 978-1-62708-180-1
... history to illustrate some of these fractography concepts. Mechanisms of Deformation and Fracture At homologous temperatures low enough that creep deformation does not contribute to strain prior to or accompanying crack propagation ( T H < ∼0.4), the mechanism of permanent deformation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... the rate of oxidation. The effects of oxygen concentration and temperature are specific to each alloy. Scale growth rate increases with a rise in temperature. Table 1 provides suggested maximum temperatures for various alloys. Suggested maximum temperatures for various alloys in continuous, isothermal...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006928
EISBN: 978-1-62708-395-9
.... The final or third-stage creep deformation is creep rupture, fracture, or breakage. The generalized uniaxial tensile creep behavior of plastics under constant force, isothermal temperature, and a given environment can be illustrated as ductile creep behavior ( Fig. 8a ) or as brittle creep behavior...