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ductile crack nucleation

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Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006775
EISBN: 978-1-62708-295-2
... discussion of both crack nucleation and propagation mechanisms that cause the fracture appearance. Discussions in this article begin with microscale models and mechanisms for deformation and fracture. Macroscale and microscale appearances of ductile and brittle fracture are then discussed for various...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000608
EISBN: 978-1-62708-181-8
... fracture, ductile fracture, impact fracture, fatigue fracture surface, reversed torsional fatigue fracture, transgranular cleavage fracture, rotating bending fatigue, tension-overload fracture, torsion-overload fracture, slip band crack, crack growth and crack initiation, crack nucleation, microstructure...
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
... concepts. bending brittle fracture compression failure deformation ductile crack nucleation ductile fracture ductility fractography manufacturing imperfections metals microvoid coalescence notched specimen plastic flow root cause failure analysis single-crystal cleavage models specimen...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003537
EISBN: 978-1-62708-180-1
... Ref 31 In a more general sense, the microscale features of fractures in crystalline materials can be described as either transgranular (TG) or intergranular (IG). Transgranular crack propagation is caused by competing mechanisms of ductile crack nucleation, growth by slip deformation mechanism...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006774
EISBN: 978-1-62708-295-2
... coverage on specific types of fracture (processes such as ductile and brittle fracture, fatigue, creep, and complex environmentally assisted cracking from stress-corrosion cracking and hydrogen embrittlement) can be found in other articles in this Volume. Articles on the fractographic appearances...
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006323
EISBN: 978-1-62708-179-5
... of ductile metals that fail as the result of nucleation, growth, and coalescence of microscopic voids that initiate at inclusions and second-phase particles. Cleavage fracture, as well as quasi-cleavage, involves separation along specific crystallographic planes of a grain, resulting in a transgranular crack...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003254
EISBN: 978-1-62708-176-4
... is schematically shown in Fig. 18 . When a crack in the ductile matrix is loaded, the large stresses ahead of the notch promote void nucleation by particle fracture or interface decohesion. This void nucleation limits the straining capacity of the metal in the vicinity of the crack tip. The high strain field...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002404
EISBN: 978-1-62708-193-1
... Resistance Curves and Engineering Applications , Vol II , Elastic-Plastic Fracture: Second Symposium , STP 803, ASTM , 1983 , p II-420 to II-438 6. de Vries M.I. and Schaap B. , Experimental Observations of Ductile Crack Growth in Type 304 Stainless Steel , Elastic-Plastic Fracture...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005405
EISBN: 978-1-62708-196-2
... ratios of nucleation, small crack lives ( N μ = N MSC + N PSC′ ), and long crack lives ( N p = ; + N LC ) for fatigue ductile and fatigue brittle materials for intermediate fatigue lives For a given arbitrary fatigue life, a material may be loosely categorized as fatigue ductile...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002379
EISBN: 978-1-62708-193-1
... is the monotonic strain hardening exponent and d T is the size of the process zone at the crack tip, proportional to the spacing between crack/void nucleating inclusions. Fracture toughness in steels also depends on the nature of martensite (low-carbon ductile martensite or high-carbon twinned martensite...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001341
EISBN: 978-1-62708-173-3
... Table 1 Effect of morphological features of the microstructure on crack nucleation and propagation in α + β titanium alloys Structure Crack nucleation Crack growth Tensile ductility as a function of plastic zone size Toughness as a function of crack propagation Lenticular...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005220
EISBN: 978-1-62708-187-0
... silicon and β-iron platelets) nucleated and grown on bifilms, causing the bifilms to straighten and create long central cracks. Source: Ref 13 Bifilms are easily opened and observed when the metal is in the liquid state. Fox and Campbell ( Ref 2 ) assumed that there would be a thin layer of air...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006777
EISBN: 978-1-62708-295-2
... distinctions between specific features or mechanisms, and so this article attempts to use the term decohesive separation only in reference to specific mechanisms. The terms dimpled IG fracture and IG brittle fracture , as defined previously, are used to distinguish between ductile and brittle cracking...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005528
EISBN: 978-1-62708-197-9
... models are necessary to predict the onset and propagation of ductile fracture that causes material separation. A major mechanism of ductile fracture initiation in metals is void nucleation caused by dislocation pileups, second-phase particle cracking, or other imperfections. Voids grow with increasing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003540
EISBN: 978-1-62708-180-1
.... The terms dimpled IG fracture and IG brittle fracture , as defined previously, are used to distinguish between ductile and brittle cracking mechanisms in the grain boundaries. This distinction, in some cases, may be helpful for appropriate evaluation of cause and corrective action. On the atomic...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000609
EISBN: 978-1-62708-181-8
... fracture, fracture by overpressurization, inclusion effect, fatigue crack propagation, ductile fatigue striation, secondary cracking, intergranular fracture, and elevated-temperature fracture of alloy steels used in pressure vessels, steam boiler superheater tubes, and box-girder bridges. alloy steel...
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005613
EISBN: 978-1-62708-174-0
... be if most of the carbon formed carbides (by the lever rule). This fact will increase the number of crack nucleation sites and thereby contribute to the inferior toughness of ICGC HAZ. As is to be expected, the volume fraction of the M-A constituent also depends on the hardenability of the steel, which...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009010
EISBN: 978-1-62708-185-6
... <30 Poor hot workability. Abundant cracks Preferably not rolled or open-die forged. Extrusion may be feasible. Rolling or forging should be attempted only with light reductions, low strain rates, and an insulating coating. 30–40 Marginal hot workability. Numerous cracks This ductility range...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0001834
EISBN: 978-1-62708-181-8
... fractures, and high-temperature fractures. brittle fracture cold cracking deep-field microscopy ductile fracture embrittlement etching fatigue fracture fracture replica light microscopy macroscopic examination quality control taper sectioning visual inspection THE VISUAL EXAMINATION...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
... crack nucleation in regions of localized strain and the subsequent crack growth mechanisms outside the plastic zone in the qualification of component designs or to conduct failure analyses. The safe-life, infinite-life philosophy is the oldest of the approaches to fatigue. The design method...