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Published: 31 December 2017
Fig. 47 Crater formation during laser-dimpling process with physical phenomena. Source: Ref 199 More
Image
Published: 31 December 2017
Fig. 46 Predicted recoil-pressure distribution using computational modeling during laser dimpling. Source: Ref 201 More
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006421
EISBN: 978-1-62708-192-4
... design approaches such as laser patterning and dimpling. Laser-surface modification of novel materials, such as high-entropy alloys and metallic glasses, is explored. The article provides an overview of hybrid techniques involving laser as a secondary tool, as well as a discussion on the improved...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006365
EISBN: 978-1-62708-192-4
... parameters, it is possible to very accurately control the diameter, depth, and area density of microdimples ( Ref 46 ). Each laser pulse delivered to the surface causes sublimation, melting, and vaporization, resulting in dimple formation. However, because of the high intensity of the laser beam pulse...
Image
Published: 31 December 2017
Fig. 17 Effect of texturing or dimple area density on coefficient of friction. AJM, abrasive jet machining; LBM, laser beam machining. Source: Ref 27 More
Image
Published: 30 August 2021
Fig. 20 Fracture surfaces of tensile tests from as-built selective-laser-melted Ti-6Al-4V specimens. (a) Cup-and-cone. (b) Dimples. (c) and (d) Quasi-cleavage facets. Source: Ref 26 , 42 More
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 June 2024
DOI: 10.31399/asm.hb.v12.a0007033
EISBN: 978-1-62708-387-4
... the fracture surface profile along x-y sections of a fracture surface from metallographic sections or nondestructive techniques; and the three-dimensional reconstruction of the fracture surface topology using imaging methods such as stereo SEM imaging and confocal scanning laser microscopy. These three general...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003536
EISBN: 978-1-62708-180-1
... is particularly useful for quantitative characterization of specific features (for example, dimples, striations, pores, facets, inclusions, etc.) present in the fracture surface ( Ref 35 , 36 ). The features of interest are characterized via estimation of their number density, average size, shape, spacing...
Series: ASM Handbook Archive
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000623
EISBN: 978-1-62708-181-8
... fracture, crack propagation, ductile overload fracture, dimpled rupture, microvoid coalescence, and quasi-cleavage fracture of these alloys. cleavage fracture ductile fracture fatigue crack growth fatigue fracture fractograph stress-corrosion cracking tensile fracture threaded fasteners...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 June 2024
DOI: 10.31399/asm.hb.v12.a0006946
EISBN: 978-1-62708-387-4
... of an overloaded alloy steel comprised primarily of ferrite normally exhibits dimpled rupture. However, the fracture surface may occasionally exhibit flat facets normally associated with cleavage, because those particular grains were oriented in a way in which the cleavage plane coincided with the fracture plane...
Series: ASM Handbook Archive
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000621
EISBN: 978-1-62708-181-8
... fast fracture. Stress-intensity range (Δ K ) was 21 MPa m (19 ksi in. ); the stress was applied in an argon atmosphere at room temperature at a frequency of 10 cps. The area has voids that may be moderate-size dimples. The vertical face is apparently a very large tear ridge or cleavage...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 June 2024
DOI: 10.31399/asm.hb.v12.a0007038
EISBN: 978-1-62708-387-4
... microscopy 20 to 10,000× (fracture surface) Metallographic inspection 50 to 1000× (cross section) Instantaneous types of fracture Ductile overload Microvoids (dimples) elongated in direction of loading Single crack with no branching Surface slip-band emergence Grain distortion...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 June 2024
DOI: 10.31399/asm.hb.v12.a0007034
EISBN: 978-1-62708-387-4
... by nucleation, growth, and coalescence of microvoids, which results in features commonly described as ductile dimples on the fracture surface. This mode of fracture also is commonly referred to as overload failure because the material fractures once the ultimate tensile strength is exceeded, and unstable...
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
... depends on the effectiveness of solution annealing in removing plastic deformation introduced during thermomechanical processing. Retention of 1 to 2% cold work is sufficient to restrict plastic deformation during the fracture process. Figures 4 and 5 compare the inclusion and dimple morphologies...
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
... is uniquely characterized by dimpled fracture surfaces due to microvoid coalescence. Microscale brittle fractures are characterized by either cleavage (transgranular brittle fracture) or intergranular embrittlement. Fracture Surface Information Correct interpretation of fractographic features...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005129
EISBN: 978-1-62708-186-3
... of steel tailor-welded blanks. Other product factors and process considerations are discussed in more detail in Ref 1 . Welding Methods for Tailored Blanks The types of welds that are used or have been considered for tailor-welded blanks include: Laser Resistance mash seam High...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005146
EISBN: 978-1-62708-186-3
.... Shearing can cause cracks at the edges of some titanium sheet thicker than 2.0 mm (0.080 in.). If cracks or other irregularities develop in a critical portion of the workpiece, an alternative method of cutting should be used, such as band sawing, abrasive waterjet cutting, or laser cutting (see...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006559
EISBN: 978-1-62708-290-7
... of melt growth ceramics At present (2020), the main preparation methods of MGC include directional solidification methods (such as the Bridgeman method), laser-heating floating zone method, microdrawing method, electron beam zone-melting method, and boundary epitaxy-growth method, as well as some...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006838
EISBN: 978-1-62708-329-4
... at specific locations on a build platform or part. The materials in the AM jetting processes involved controlled deposition of curable polymers or atomized melt (material jetting) or powder deposition with binder resins (binder jetting). Other AM technologies emerged with the development of selective laser...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 June 2024
DOI: 10.31399/asm.hb.v12.9781627083874
EISBN: 978-1-62708-387-4