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Grain boundary sliding

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Published: 01 September 2008
Fig. 22 Intergranular crack formation at high temperature by grain-boundary sliding at (a) triple points and (b) inclusions More
Image
Published: 01 August 2005
Fig. 2.84 Micrograph showing intergranular cracking due to grain-boundary sliding. Source: Ref 2.51 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
..., dislocation movement, and grain boundary sliding. It describes these mechanisms in qualitative terms, explaining how they are driven by thermal energy and how they can be analyzed using creep curves and deformation maps. In addition, it examines the types of damage associated with creep, presents a number...
Image
Published: 01 July 2009
Fig. 8.21 Simplified schematic illustration of the creep-fatigue interaction when tensile creep occurring along grain boundaries is reversed by compressive plasticity occurring along crystallographic slip planes. (a) Laboratory specimen. (b) Two deformation systems. (c) Grain-boundary sliding More
Image
Published: 01 August 2005
Fig. 2.83 Models illustrating how intergranular cracks form due to grain-boundary sliding. Source: Ref 2.55 More
Image
Published: 01 July 2009
Fig. 1.11 Schematic drawings of the way intergranular cracks form due to grain-boundary sliding. Source: Ref 1.23 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060043
EISBN: 978-1-62708-343-0
... by sliding along the grain boundary together with tensile-stress-induced void formation within the boundary, this can be schematically illustrated, as shown by the tensile half-cycle in Fig. 3.2(b) . For the compressive portion, plasticity is represented by slip along a favorably oriented slip plane. After...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240279
EISBN: 978-1-62708-251-8
... at a low strain rate, grain-boundary sliding can occur. Creep forming, hot die forging, isothermal forging, and isothermal rolling are processes that rely in part on grain-boundary sliding and other thermally activated deformation mechanisms. The workability, or the ease with which a metal is shaped...
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
... that for bulk diffusion. Grain-boundary sliding is often observed in the final stages of creep just prior to failure. As the grains change shape, relative movement of the grain centers is necessary to maintain continuity at the grain boundaries. The grains actually start rotating and elongating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.sap.t53000017
EISBN: 978-1-62708-313-3
... to this solid-solution depletion effect. Carbides can also provide strengthening in the same way as precipitates when they occur within the grain, but their main effect is when they occur as intergranular deposits and act to prevent grain-boundary sliding; thus, they improve creep resistance ( Ref 11...
Image
Published: 01 July 2009
Fig. 3.16 Examples of CP damage and cracking in AISI type 316 stainless steel at 705 °C (1300 °F), at only 10% of expected creep-fatigue life. (a) Voiding in grain boundaries and slip-plane sliding. (b) Intergranular cracking and slip-plane sliding. Source: Ref 3.3 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.fdmht.t52060173
EISBN: 978-1-62708-343-0
... slip and creep strain by grain-boundary sliding) and the distinction of whether they occur during the tensile or compressive half of the cycle. Although quantitative results by the method do not depend on the requirement that these strains be in the slip planes and grain boundaries, this assumption...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230209
EISBN: 978-1-62708-298-3
...) and porosity is also an important factor. Heat treatment is important in controlling the distribution of some impurities between grain boundaries and matrix as well as controlling grain size, yield points, and precipitation hardening. The properties discussed are tensile properties, fracture toughness, creep...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... diffusion. Grain-Boundary Sliding Grain-boundary sliding is often observed in the final stages of creep, just prior to failure. As the grains change shape, relative movement of the grain centers is necessary to maintain continuity at the grain boundaries. The grains actually start rotating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240117
EISBN: 978-1-62708-251-8
... to the nonhomogeneous deformation of the structure as a result of the anistropic nature of the large grains. However, coarse grains are beneficial for creep resistance in high-temperature alloys because they are more resistant to grain-boundary sliding and rotation. Fig. 8.24 Effect of grain size on cold-drawn...
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
... transgranular fracture. In creep tests in which one or more of the recovery and softening processes become important, all three of the reactions described above determine together the shape of the creep curve. In addition, grain-boundary sliding and intercrystalline fracture may also begin to contribute...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630063
EISBN: 978-1-62708-270-9
... of the cells but are seen as a splitting of the grains, with no relation to the grain boundaries. This is analogous to fracture through (not between) the bricks in a brick wall. In many cases the direction that the crack follows can be determined from study of the cleavage fracture faces under the electron...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130111
EISBN: 978-1-62708-284-6
... cracks Voids formed on grain boundaries or wedge-shaped cracks at grain triple points Reaction scales or internal precipitation Some cold flow in last stages of failure Contributing factors Load exceeded the strength of the part Check for proper alloy and processing by hardness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240017
EISBN: 978-1-62708-251-8
... assisting the diffusion of atoms. The number of dislocations is reduced when the vacancies diffuse to grain boundaries or surfaces, which act as sinks. If a metal is heated to a high temperature, the number of vacancies increases. If it is then suddenly quenched to room temperature, the vacancies...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240563
EISBN: 978-1-62708-251-8
... of grain-boundary sliding during high-temperature service. If there are no carbides along the grain boundaries, voids can form and cause excessive grain-boundary sliding. Carbon is added to form carbides in both the matrix and at the grain boundaries. In nickel-base alloys, wrought alloys contain...