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power law creep

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By Sammy Tin
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005404
EISBN: 978-1-62708-196-2
... known as constitutive equations that relate the dependence of stress, temperature, and microstructure on deformation. The article reviews the characteristics of creep deformation and mechanisms of creep, such as power-law creep, low temperature creep, power-law breakdown, diffusional creep, twinning...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003287
EISBN: 978-1-62708-176-4
... supports the concept that power law creep is diffusion controlled. Diffusion is needed to enable dislocations to climb past obstacles to their continued glide. Thus, creep occurs by the sequential processes of dislocation glide and climb. As the climb step is slower than glide, it is rate controlling...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005506
EISBN: 978-1-62708-197-9
..., the third equation is the constitutive equation, which takes the form of a power-law creep model relating creep strain rate ( ε ˙ c ) to stress through: (Eq 4) ε ˙ c = B σ n where B and n are fitting parameters describing the creep deformation behavior of the material...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005606
EISBN: 978-1-62708-174-0
... Diffusion Bonding of Metals , Trans. JWRI , Vol 17.1 , 1988 , p 135 – 148 • Wilkinson D.S. and Ashby M.F. , Pressure Sintering by Power Law Creep , Acta Metall. , Vol 23 , 1975 , p 1277 – 1285 10.1016/0001-6160(75)90136-4 Diffusion Bonding Process Bonding Surfaces...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001350
EISBN: 978-1-62708-173-3
.... and Ashby M.F. , Pressure Sintering by Power Law Creep , Acta. Metall. , Vol 23 , 1975 , p 1277 – 1285 The DB process, that is, the application of pressure and temperature to an interface for a prescribed period of time, is generally considered complete when cavities fully close...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003288
EISBN: 978-1-62708-176-4
.... 4 Creep data for several fcc metals plotted as a function of normalized shear stress (σ s / G ) compared with a power-law stress exponent of n = 4. Because the activation for creep ( Q in Eq 2 ) is the same as that for diffusion, the term exp (− Q / RT ) in Eq 2 is replaced here...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005293
EISBN: 978-1-62708-187-0
... (IN-718, René 77) 1185 2165 100 15 4 Cobalt-base alloys (F75) 1220 2200 100 15 4 Nickel-base superalloys—II (Mar-M 247, René 125) 1185 2165 175 25 4 There are four main mechanisms by which pores are eliminated during HIP: Plastic flow Power law creep Coble (grain...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005512
EISBN: 978-1-62708-197-9
... to a neck Volume diffusion from a surface source to a neck Evaporation from a surface source to condensation at a neck Grain-boundary diffusion from an interfacial source to a neck Volume diffusion from an interfacial source to a neck Power-law creep Given an initial geometry (i.e...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003448
EISBN: 978-1-62708-195-5
... 15.3 21 18.7 17.0 Al + 55 vol% Al 2 O 3 ( Ref 21 ) 5 18.0 16.4 12.8 19.5 17.7 29.2 24.0 21.8 Creep rupture data for Ti-SCS composites (nominally 35 vol%) Table 26 Creep rupture data for Ti-SCS composites (nominally 35 vol%) Matrix Orientation...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004020
EISBN: 978-1-62708-185-6
... for which N-H creep dominates 50(Ω) −2/3 0 3 Nabarro-Herring creep of subgrains High temperature and stresses such that the subgrain size is less than the grain size. (Subgrain size, d s ′, scales with stress approximately as d s ′=20(μb/σ) 0.01(Ω) −2/3 2 0 Generalized power-law creep...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005183
EISBN: 978-1-62708-186-3
.... Hecker S.S. and Stout M.G. , Strain Hardening of Heavily Cold Worked Metals , Deformation, Processing, and Structure , Krauss G. , Ed., American Society for Metals , 1984 , p 1 – 46 2. Kocks U.F. , Laws for Work-Hardening and Low Temperature Creep , J. Eng. Mater. Tech...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005458
EISBN: 978-1-62708-196-2
... , Philos. Trans. R. Soc. (London) A , Vol 288 , 1978 , p 177 – 196 • Edington J.W. , Melton K.N. , and Cutler C.P. , Superplasticity , Prog. Mater. Sci. , Vol 21 , 1976 , p 63 – 170 • Edward G.H. and Ashby M.F. , Intergranular Fracture during Power-Law...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003307
EISBN: 978-1-62708-176-4
... in Power Plants , JOM , Feb 1992 10. Staley J.T. Jr. , “Mechanisms of Creep Crack Growth in a Cu-1 wt. % Sb Alloy,” MS thesis, Georgia Institute of Technology , 1988 11. Bassani J.L. and Vitek V. , Proc. Ninth National Congress of Applied Mechanics—Symposium on Non...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002389
EISBN: 978-1-62708-193-1
... , stress redistribution in the crack-tip region cannot be ignored. Thus Eq 2 must be modified to include the elastic term in addition to the power-law creep term. Under these circumstances, C ∗ is path-dependent and it no longer uniquely determines the crack-tip stress fields given by Eqs 6 and 7...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006557
EISBN: 978-1-62708-290-7
..., where pore fraction and flow stress resemble an inverse relationship. Pores shrink as hydrostatic pressure exceeds the reduced yield point of the material at the HIP temperature, allowing for local plastic flow on the microscopic scale ( Ref 40 ). The power-law creep mechanism alternatively uses...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002476
EISBN: 978-1-62708-194-8
.... , Noninteractive Macroscopic Reliability Model for Ceramic Matrix Composites with Orthotropic Material Symmetry , J. Eng. Gas Turbines Power (Trans. ASME) , Vol 112 ( No. 4 ), 1990 , p 507 – 511 10.1115/1.2906196 12. Nemeth N.N. , Manderscheid J.M. , and Gyekenyesi J.P. , “Ceramics...
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 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...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005147
EISBN: 978-1-62708-186-3
... , 2004 , p 3111 10.1016/j.actamat.2004.03.012 16. Mukai T. , Tsutsui H. , Watanabe H. , Ishikawa K. , Okanda Y. , Kohzu M. , Tanabe S. , and Higashi K. , in Proceedings of the Eighth International Conference on Creep and Fracture of Engineering Materials...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002391
EISBN: 978-1-62708-193-1
... period A,m = constants, Δε = strain range N f = cycles to failure Summary of creep-fatigue laws Table 6 Summary of creep-fatigue laws Ref Experiments/mechanism Equation 58 , 64 Isothermal: creep damage in tension versus compression 1 N pred = F...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002472
EISBN: 978-1-62708-194-8
.... and Woodford D.A. , The Evaluation of Creep Damage in a Cr-Mo-V Steel , STP 515, ASTM , 1972 , p 89 – 106 86. Viswanathan R. and Gehl S.M. , Life-Assessment Technology for Power-Plant Components , JOM , Vol 44 ( No. 2 ), 1992 , p 34 – 42 10.1007/BF03222769 87...