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eutectic microstructure

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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
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0046022
EISBN: 978-1-62708-217-4
... on the inside surface of a bearing hole, and small areas of pitting corrosion were visible on the exterior surface of the fitting. The analysis also revealed a small number of rosettes, suggestive of eutectic melting, in an otherwise normal structure. These examinations and analyses support the conclusion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047307
EISBN: 978-1-62708-223-5
.... The microstructure consisted of eutectic chromium carbides (Cr7C3) in a matrix of retained austenite and martensite intermingled with secondary carbides. Analysis (visual inspection and 500x view of sections etched with Marble's reagent) supported the conclusion that the low hardness resulted from an excessive...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001249
EISBN: 978-1-62708-236-5
... of the cast material ( Fig. 6 ). The microhardness of the ferrite grains with finely precipitated carbides is 350 to 370 kgf/mm 2 (HV) but of the ledeburitic eutectic ca 530 kgf/mm 2 (HV). Fig. 6 Crack path in part of flange with unaltered microstructure. Etched (CuSO 4 + HCl + H 2 O). 200...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001207
EISBN: 978-1-62708-235-8
... ×. Carburized locations. Hyper-eutectoid. Fig. 8 Microstructure in the weldseam, longitudinal section. Etchant: Nital. 500 ×. Carburized locations. Hypo-eutectic cast iron. Figure 4 represents the normal microstructure of the weldseam which is the overheated structure of a steel low in carbon...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001823
EISBN: 978-1-62708-241-9
... for this conclusion includes the morphology of the through-wall feature, which is consistent with resolidification of molten metal and the presence of hardened microstructures near the feature, including eutectic iron. Various methods can be employed to protect belowground pipelines from high-voltage lightning...
Image
Published: 01 June 2019
Fig. 8 Microstructure in the weldseam, longitudinal section. Etchant: Nital. 500 ×. Carburized locations. Hypo-eutectic cast iron. More
Image
Published: 01 June 2019
Fig. 8 Microstructure of heat affected zone. Left martensite (black) with ledeburite eutectic, right recrystallised structure. Etched (FeCl 3 + HCl + ethanol). 100 × More
Image
Published: 01 June 2019
Fig. 19 Etched microstructural features of the investment cast MAR-M302 vane. (a) Eutectic carbide pools and script-type carbides; (b) Coarse peppery secondary carbide in the background. More
Image
Published: 01 December 1993
Fig. 9 Micrograph of section of core from rail flange. Microstructure is predominantly pearlite with small amounts of grain-boundary ferrite, as expected from near-eutectic composition. Nital etch. 268× More
Image
Published: 01 June 2019
Fig. 1 Microstructure of a cast iron breaker bar that suffered premature wear. The structure is eutectic chromium carbide (Cr 7 C3) in a matrix of retained austenite and martensite. Some patches of martensite are intermingled with secondary carbides. Etched with Marble's reagent. 500× More
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
... boundary phases bridging between grains Fig. 10 Scanning electron microfractograph of crack forced open in laboratory (see Fig. 7 ). Fracture surface was etched for 2 min with “V2A etchant” at 80 °C. Evidence of formerly molten low-melting eutectic phases, probably a carbide eutectic, on grain...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001529
EISBN: 978-1-62708-217-4
... Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 The 10-10 Etchant is customized for the CuMgAl 2 , eutectic phase in 2024. This two-step etchant can show general microstructural features without destroying the subtle features associated with local eutectic melting...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001687
EISBN: 978-1-62708-220-4
... microstructures of HK40 alloys ( 1 , 2 , 3 ). As indicated by Zaghloul et al ( 3 ), there is extensive coarsening of the eutectic precipitates during service, specially along the interdendritic regions. This is shown in Fig. 1 , where it can be noted the presence of massive carbides at the grain boundaries...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001247
EISBN: 978-1-62708-228-0
... strength, resulting in ductile rupture. The minimum overheating temperature could be deduced at around 1200 deg F due to the presence of a eutectic observed metallographically within the surface corrosion products. Heaters (tube) Rupturing 316 UNS S31600 High-temperature corrosion and oxidation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0090974
EISBN: 978-1-62708-235-8
.... 1(a) and 1(b) . The casting exhibited a tempered-martensite microstructure with massive, eutectic type II manganese sulfide (MnS) stringer inclusions at the prior-austenite grain boundaries. These are characteristically more embrittling than the globular type I manganese sulfides...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001532
EISBN: 978-1-62708-232-7
... Characteristics The nital-etched microstructures of all failed roll samples showed martensite (dark gray to black) with retained austenite in needle interstices, carbide (white), and graphite phases. The carbide phase was of eutectic type and appeared in continuous networks. Typical micrographs of nital...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001571
EISBN: 978-1-62708-229-7
... and the A533 Grade B plate material to a depth of about mid-wall. The microstructures of these specimens were compared to that of specimens cut from the Midland, Michigan reactor vessel, made from the same grade and thickness but never placed in service. These specimens were subjected to known thermal...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001303
EISBN: 978-1-62708-215-0
... not specified; for information only Fig. 1 General view of sprocket drive wheel, showing extensive cracking around each bolt hole. −0.21×. Fig. 2 Section showing comparatively coarse eutectic structure and (dark) platelike constituent. Etched in 20% sulfuric acid at 70 °C (160 °F). 152.5...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0046476
EISBN: 978-1-62708-234-1
... Abstract A fused-salt electrolytic-cell pot containing a molten eutectic mixture of sodium, potassium, and lithium chlorides and operating at melt temperatures from 500 to 650 deg C (930 to 1200 deg F) exhibited excessive corrosion after two months of service. The pot was a welded cylinder...