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dimpled intergranular fracture

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610055
EISBN: 978-1-62708-303-4
... Intergranular fracture in hardened steel, viewed under the scanning electron microscope. Note that fracture takes place between the grains; thus, the fracture surface has a “rock candy” appearance that reveals the shapes of part of the individual grains. Original magnification: 2000×. Source: Ref 10...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
... or intergranular fracture) or from geometric conditions (notches, cracks, section size) that constrain deformation and thereby induce plane-strain crack growth under tension. These various mechanisms are described in section 2.4 . Fracture by glide is a ductile-type fracture from deformation along a shear...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130503
EISBN: 978-1-62708-284-6
.... The bright round spot may consist of a local region of typically inter-granular or possibly cleavage fracture surrounded by ductile dimpled failure. Both intergranular and cleavage failures are brittle fracture modes that appear much more brightly than the surrounding material, which is ductile dimpled...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270196
EISBN: 978-1-62708-301-0
... of the screws. Gross fracture features were typical of brittle failure with limited ductility. Scanning Electron Fractography Hardness Discussion Conclusion Recommendations Under the SEM, close to the thread root, intergranular fracture with partially formed dimples on the fracture facets...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270025
EISBN: 978-1-62708-301-0
... in tension. Tensile overload fracture is caused by the coalescence of microvoids in the material and is manifested as equiaxed dimples in the magnified electron fractograph. If the ductile failure is due to shear forces, for example, as in torsion fractures, the dimples will be elongated, with an open end...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630063
EISBN: 978-1-62708-270-9
... Microfractography Dimpled rupture Cleavage The reader may be aware that there are fracture modes other than shear and cleavage. These include intergranular and quasi-cleavage fracture modes for single-load applications, and fatigue for multiple-load applications. However, they do not have their origins...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
... surface. The fracture topography at the origin was intergranular. The dimensions of the origin were 0.5 mm wide by 0.19 mm deep (0.02 in. by 0.0075 in.). Away from the origin was a static rupture area, which was characterized by dimples. Approximately 85% across the thickness, an arrest mark was present...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.9781627083010
EISBN: 978-1-62708-301-0
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630101
EISBN: 978-1-62708-270-9
... certain areas with intergranular fracture and others with dimple rupture. No true fatigue striations are possible in a single-overload fracture; however, there may be somewhat similar-appearing parallel ridges resulting from fracture through pearlite or other lamellar structures, or resulting from...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270130
EISBN: 978-1-62708-301-0
... the bolts were ultrasonically cleaned and observed under the stereobinocular and SEM. Under the SEM, only a mud-crack pattern was seen on the fracture surface of the heavily oxidized bolts (e.g., bolt No. 2, Fig. CH28.2 ). The other bolts, 1, 4, and 5, showed a clear pattern of intergranular cracking...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
... on tensile-fracture surfaces of aluminum-copper alloys when metallographic sections have shown that the fracture path was apparently intergranular and nominally brittle. Isolated dimples on brittle intergranular-fracture surfaces of Al-Zn-Mg alloys have been observed. These observations are generally...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270102
EISBN: 978-1-62708-301-0
... with an average spacing of 2.5 μm ( Fig. CH17.11 ). At other places on the same fracture surface, striations were also observed with an average spacing of 0.4 μm. The bolts with double fracture origins showed dimple rupture at the central region ( Fig. CH17.12 ). In each assembly, one or two bolts showed mixed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270070
EISBN: 978-1-62708-301-0
... and Recommendations Sections were cut from the bolt head to study the fractography features. Figure CH3.2 shows the sectioned bolt head. Figure CH3.3 shows the intergranular nature of the fracture with dimples in some of the facets. Figure CH3.4 is a metallograph showing the fracture path. There is clear...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130043
EISBN: 978-1-62708-284-6
...Abstract Abstract This chapter provides an overview of the possible mechanisms of failure for heat treated steel components and discusses the techniques for examining fractures, ductile and brittle failures, intergranular failure mechanisms, and fatigue. It begins with a description...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270031
EISBN: 978-1-62708-301-0
.... The fractal dimensions derived from the log R L versus log η plot were 1.18 for the dimples and 1.06 for the slip steps. For the same steel, fractured at 77 K to produce an intergranular fracture, there were three distinct fractographic features: the grain boundary slip steps with the spacing of ~0.8...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270107
EISBN: 978-1-62708-301-0
... rivets. All of the rivets on the failed blade were missing and sections of skin were torn from most of the rivet holes. One such rivet hole was examined in a SEM, revealing corrosion on one of the tear surfaces and dimples (characteristic of ductile overload failure) on the other. In addition, the inner...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080379
EISBN: 978-1-62708-304-1
... Specimen Failure location Rupture life, h Elongation, % Reduction in area, % Fracture mode As-received Smooth 963 19 21 Dimple Aged (a) Smooth 5348 4 4 Intergranular (a) Aged at 590 °C (1100 °F) for 10,000 h. Source: Ref 16 Results of stress rupture tests at 590 °C...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060385
EISBN: 978-1-62708-261-7
... microscope (SEM) images of (a) intergranular fracture in the ion-nitrided surface layer of a ductile iron (ASTM 80-55-06), (b) transgranular fracture by cleavage in ductile iron (ASTM 80-55-06), and (c) ductile fracture with equiaxed dimples from microvoid coalescence around the graphite nodules in a ductile...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630081
EISBN: 978-1-62708-270-9
... opposite the origin. The interior, or core, is likely to have a ductile fracture with dimpled rupture on the microscale. Fig. 5 Surface of a torsional fatigue crack that caused brittle fracture of the case of an induction-hardened axle of 1541 steel. The fatigue crack originated (arrow...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2007
DOI: 10.31399/asm.tb.pmsspmp.t52000203
EISBN: 978-1-62708-312-6
... bands of iron oxide and spinel. Anchoring of the scale is also seen at a surface pore. Good bonding between the scale formed and the PM stainless steel leads to minimal loss of mass thickness in cyclic oxidation test Fig. 42 SEM image of dimpled fracture surface of a well-sintered, ductile PM...