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creep deformation

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Published: 01 November 2012
Fig. 2 Stages of creep deformation. (a) Strain curve for the three stages of creep under constant-load testing (curve A) and constant-stress testing (curve B). (b) Relationship of strain rate, or creep rate, and time during a constant-load creep test. The minimum creep rate is attained during More
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Published: 01 July 2009
Fig. 1.10 Creep deformation maps for MAR-M200. (a) Grain size = 100 μm. (b) Grain size = 1 cm. Source: Ref 1.7 More
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Published: 01 August 2005
Fig. 17 Typical creep deformation with intergranular cracking in a jet-engine turbine blade More
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Published: 01 December 1989
Fig. 3.22. Schematic representation of the levels of creep deformation under which creep-crack growth can occur ( Ref 120 ). More
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Published: 01 December 1989
Fig. 6.19. Progress of creep deformation at the bore, calculated from measurements at the rim, for Parsons 500-MW HP and IP rotors in CEGB units ( Ref 44 ). More
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Published: 01 July 2009
Fig. 1.3 Time-dependent deformation and recovery of primary creep. (a) Schematics of various time-dependent deformation. (b) Curve of primary creep recovery for polycrystalline aluminum in torsional creep at 175 °C (347 °F). Source: Ref 1.2 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060001
EISBN: 978-1-62708-343-0
... Arrangement of atoms in a small-angle tilt boundary to demonstrate that grain boundaries contain many edge dislocations. Source: Ref 1.2 Fig. 1.9 Simplified deformation mechanism map. Source: Adapted from Ref 1.20 Fig. 1.10 Creep deformation maps for MAR-M200. (a) Grain size = 100 μm...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... Abstract This chapter compares and contrasts the high-temperature behaviors of metals and composites. It describes the use of creep curves and stress-rupture testing along with the underlying mechanisms in creep deformation and elevated-temperature fracture. It also discusses creep-life...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060049
EISBN: 978-1-62708-261-7
... Abstract This chapter introduces the concepts of mechanical properties and the various underlying metallurgical mechanisms that can be used to alter the strength of materials. The mechanical properties discussed include elasticity, plasticity, creep deformation, fatigue, toughness, and hardness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540281
EISBN: 978-1-62708-309-6
.... Elastic-plastic or fully plastic analysis such as the J -integral approach is used when large-scale yielding occurs. For crack growth at high temperature, under constant load, the material near the crack tip may undergo viscoelastic deformation, or creep. The crack-tip stress field, which takes the basic...
Image
Published: 01 October 2011
because of internal stresses left by molding and viscous (creep) deformation at service temperatures. ECM, electrochemical machining; EDM, electrical discharge machining. Source: Ref 6.2 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... the limiting design factor. However, at high temperatures, permanent deformation can occur over a period of time at stresses well below the yield strength. This time-dependent deformation is known as creep and occurs at temperatures greater than approximately 0.3 to 0.5 of the absolute melting point. In creep...
Image
Published: 01 November 2007
Fig. 14.14 Fe-12Cr-3Al-3Ti showing preferential corrosion penetration for the specimen under creep deformation at 600 °C (1110 °F) in H 2 -34.3H 2 O-18.5CO 2 -3.8CH 4 -7.9CO-1.3H 2 S for 615 h (upper figure) and uniform corrosion attack for the specimen under no external stress (or strain More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780185
EISBN: 978-1-62708-281-5
... in plastics Creep curves generally exhibit three distinct phases. First-stage creep deformation is characterized by a rapid deformation rate that decreases slowly to a constant value. The four-parameter model was proposed to describe long-term creep. In this model, the first-stage creep deformation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060385
EISBN: 978-1-62708-261-7
... not as serious (or as sudden) as fracture, because wear is usually anticipated. Failures can also be induced by service temperatures. Examples include creep deformation and rupture at elevated temperature, or the brittle fracture of body-centered cubic (bcc) metals at low temperatures. Cyclic stress (fatigue...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1989
DOI: 10.31399/asm.tb.dmlahtc.t60490059
EISBN: 978-1-62708-340-9
... of the levels of creep deformation under which creep-crack growth can occur ( Ref 120 ). Fig. 3.23. (a) Load-line deflection as a function of time for bodies of crack lengths a and (a + Δa) at various load levels, and (b) definition of the C t parameter ( Ref 120 ). Fig. 3.3. Variation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080379
EISBN: 978-1-62708-304-1
... penetration. On the other hand, the nondeformed specimen (i.e., the specimen that was not under creep deformation during the exposure) showed no changes in the depth of the internal oxidation penetration during the exposure for times up to 1000 h. The internal oxidation penetration in the deforming Fe-18Cr...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1995
DOI: 10.31399/asm.tb.sch6.t68200083
EISBN: 978-1-62708-354-6
.... Castings can be efficiently designed for the proper section stiffness and resistance to buckling. At high temperatures, time-dependent deformation can occur at stresses below the short-time tensile yield strength. This creep deformation may cause failure by excessive deformation. Stress rupture or time...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060043
EISBN: 978-1-62708-343-0
... 3.1 Fig. 3.3 Simple cyclic deformation models for strain-range partitioning Fig. 3.2 Schematic illustration of creep-fatigue interaction when tensile creep occurring along grain boundaries is reversed by compressive plasticity occurring along crystallographic slip planes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... Abstract This chapter examines the phenomena of deformation and fracture in metals, providing readers with an understanding of why it occurs and how it can be prevented. It begins with a detailed review of tension and compression stress-strain curves, explaining how they are produced and what...