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dendritic microstructure

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Published: 01 December 1993
Fig. 9 Dendritic microstructure of weld metal More
Image
Published: 01 December 1993
Fig. 5 Dendritic microstructure of weld metal. 332× More
Image
Published: 01 December 1993
Fig. 5 Section parallel to the crack plane, showing the characteristic dendritic microstructure produced by investment casting More
Image
Published: 01 December 1993
Fig. 3 Typical section through the inside surface of a tube in an area above the level of uniform corrosion, showing localized dissimilar-metal corrosion to a depth of 0.38 mm (0.015 in.) in the base metal at an interface with the weld seam. Note the dendritic microstructure of the weld More
Image
Published: 01 December 2019
Fig. 11 Microstructure of cracked zone: ( a ) aluminum dendrite and eutectic silicon particle distribution; ( b ) pore with a > 500-μm diameter; ( c ) pore 100 μm from the surface; and ( d ) porosity near the threads More
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001311
EISBN: 978-1-62708-215-0
... corrosion were examined metallographically. The typical microstructure ( Fig. 3 ) of a section through an interface between a weld seam and the base metal, at intermediate levels above the area of uniform corrosion, shows that the weld was dendritic, indicating either improper control of the flash-welding...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001357
EISBN: 978-1-62708-215-0
... the distribution of carbides on grain boundaries and inside them, as well as of γ′ precipitates. Figure 5 , representing a section parallel to the crack plane, shows the characteristic dendritic microstructure produced by the investment casting method, with a grain size on the order of 0.5 to 1.0 mm...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001197
EISBN: 978-1-62708-235-8
... and the graphite in part showed a granular formation, so that strength of the material was low. In a second crankcase with the same crack formation the structure in the thick-wailed part was better. But it also showed granular graphite in the ferritic matrix in the thin-walled part between the dendrites...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001014
EISBN: 978-1-62708-223-5
... Abstract A tool used to stretch reinforcement wires in prestressed concrete failed. All eight individual jaws were broken. Visual examination of the fracture surfaces indicated that about half of the broken parts had a partially dendritic appearance. Further, fracture surfaces near...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001200
EISBN: 978-1-62708-221-1
... in a basic mass of pearlite with little ferrite. But the thin-walled part showed a structure of dendrites of precipitated primary solid solution grains with pearlitic-ferritic structure and a residual liquid phase with granular graphite in the ferritic matrix. The structure was formed by undercooling...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001329
EISBN: 978-1-62708-215-0
... of wrought aluminum bronze material (α phase). This microstructure was found in all of the specimens examined. The socket-weld material was dendritic in appearance ( Fig. 5 ), and no evidence of cracking was found in any of the sections examined. Fig. 4 Microstructure of pipe material, composed of α...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001327
EISBN: 978-1-62708-215-0
...% C welded steel. Fig. 8 Typical ferrite and pearlite microstructure of base material Fig. 9 Dendritic microstructure of weld metal Fig. 10 Fine pearlite microstructure of HAZ Crack Origins/Paths Figure 11 shows an optical micrograph of a crack prior to etching...
Image
Published: 01 December 1993
Fig. 4 Representative microstructure observed for the aluminum pieces. The structure consists of dendrites of primary aluminum with interdendritic silicon particles. Note the presence of solidification porosity. Unetched. (a) 31.5×. (b) 252× More
Image
Published: 01 December 1992
Fig. 3 Micrographs of typical impeller microstructures, consisting of alpha dendrites with segregation, randomly dispersed lead particles, and shrinkage voids. Etched in ammonium hydroxide/hydrogen peroxide. (a) 62×. (b) 496×. More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001753
EISBN: 978-1-62708-241-9
... to the component hardening to 28 BHN higher than the standard value. Metallographic Analysis The sectioned piece used for hardness testing was also prepared for metallographic inspection. Figure 7 is a micrograph of the casting which demonstrates a dendritic microstructure within grains, as well...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089676
EISBN: 978-1-62708-224-2
... segregation observed in the microstructure shown in Fig. 1c . The presence of the dendritic pattern indicates that the link was not heat treated after casting, because austenitizing followed by rapid cooling would have homogenized the microstructure and largely eliminated the dendritic pattern. Although...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001049
EISBN: 978-1-62708-214-3
... products in crack. 800×. Metallography Microstructural Analysis Microstructural analysis of the weld revealed overlapping regions of long dendrites( Fig. 8 ). The dendrites lay in a matrix of austenite grains. Niobium-bearing carbides were present in interdendritic spaces ( Fig. 9 ). Fig...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001304
EISBN: 978-1-62708-215-0
... welding procedure, both the external and internal weld beads exhibited a dendritic microstructure. Optical microscopic examination of representative failed specimens of the diffuser intake subassembly indicated cracks near the weld interface with the type 310 stainless steel flange ( Fig. 6...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048777
EISBN: 978-1-62708-229-7
... with the carbon content and indicates a high susceptibility to cracking upon cooling or deformation. Fig. 2 Section through arc-gouged drain groove showing thin layer of dendritic structure containing cracks. Etched with nital. 55× The microstructure of the main fracture surface in unaffected base...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001838
EISBN: 978-1-62708-241-9
... root causes of the cracking in the pipes. Non-metallic inclusions (slag etc.). This condition was ruled out by metallographic findings. “Titanium-induced” cracking. This condition was ruled out by metallographic findings. The microstructure was found to be unremarkable, with normal (even...