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grain coarsening

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001088
EISBN: 978-1-62708-214-3
... steel and that a low-carbon steel welding procedure had been used. This resulted in incipient cracks in the stainless steel weld metal near the toes of the component-to-shaft welds. The hardnesses of the heat-affected zones were as high as 58 HRC, and they were grain coarsened. The parting of the shaft...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001850
EISBN: 978-1-62708-241-9
... of the bulge. Microstructural and EDS analysis yielded evidence of overheating, revealing voids, scale, grain boundary oxidation, decarburization, and grain coarsening on the inner surface of the pipe, which also suggest the initiation of creep. Based on the information gathered during the investigation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0091048
EISBN: 978-1-62708-235-8
... to a combination of high residual stresses, a mixed microstructure, inclusions, and gross grain coarsening. These synergistic factors resulted from extreme heat input during fillet welding. Recommendations included altering the welding variables such as current, voltage, and travel speed to substantially reduce...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0046981
EISBN: 978-1-62708-218-1
..., and a high operating temperature in a corrosive environment. When the microstructure near the stem surface was examined, it was apparent that carbide spheroidization had occurred. Also, there was a coarsening of the carbide network within the austenite grains. The microstructure indicated that the underhead...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001574
EISBN: 978-1-62708-223-5
.... Also, extensive grain growth with grain boundary coarsening (indicating grain boundary precipitation) 1 , 2 was observed ( Figure 1b ). EDS of the yellow layer indicated an increase in N and O peaks. In case of the unused part, no yellow layer was observed and the microstructure with respect...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001818
EISBN: 978-1-62708-241-9
... corrosion nickel-base superalloy metal loss wall thinning grain coarsening stereomicroscopy temperature Incoloy 800 (nickel-base superalloy) UNS N08800 Introduction and Background Information Investigation and Results Discussion Conclusions Recommendations Acknowledgments...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0046998
EISBN: 978-1-62708-232-7
... region, as shown in Fig. 1 ) corresponded to the normal fine-grain microstructure of the alloy (ASTM grain size 4 to 7, but predominantly 5 to 7). Extreme grain coarsening was observed in the corroded region of the failed tube at the approximate midpoint of the 3-mm (0.120-in.) wall thickness (third...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001269
EISBN: 978-1-62708-215-0
... to quenching for high speed tool steels such as M2 is typically 1177 to 1218 °C (2150 to 2225 °F). This temperature is near the eutectic melting point. Slight overheating will cause localized melting and grain coarsening, although no such overheating was observed. Overheating and poor quenching may result...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001756
EISBN: 978-1-62708-241-9
... as coarse as ASTM no. 0.5 are also observed in these blades. However, the variation in grain size in HPTB-3 blade was observed from ASTM no. 0.5–4. Further, the samples from the failed HP turbine blades were apparently free from any signatures of overheating like grain coarsening, grain boundary thickening...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001257
EISBN: 978-1-62708-235-8
... ammonium chloride solution according to Heyn. 1× The uncracked pipe showed a ferritic-pearlitic structure in micro-section. Except for grain coarsening and a partially spear-like formation of ferrite (Widmannstätten structure), no major changes had occurred in the vicinity of the weld seam due...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001346
EISBN: 978-1-62708-215-0
... hardening and grain coarsening. The total effect would be to deplete the chromium content of the alloy, particularly at the grain boundaries and the surface. The tube material of Unit 1 suffered from oxidation and intergranular attack from both the steam side and the gas side ( Fig. 3...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0060154
EISBN: 978-1-62708-234-1
... area gave the following evidence that the header metal had not been subjected to gross overheating in service: The header metal still had a general grain structure that would be classified as being of fine size, while severe grain coarsening would have occurred if the header metal had been heated...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003543
EISBN: 978-1-62708-180-1
... • Multiple intergranular fissures covered with reaction scale• Grain faces may show porosity Metallographic inspection, 50–1000× (cross section) • Grain distortion and flow near fracture• Irregular, transgranular fracture • Little distortion evident• Intergranular or transgranular• May relate to notches...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006778
EISBN: 978-1-62708-295-2
... at magnifications above 500× • Overload zone: may be either ductile or brittle • Multiple intergranular fissures covered with reaction scale • Grain faces may show porosity Metallographic inspection, 50–1000× (cross section) • Grain distortion and flow near fracture • Irregular, transgranular fracture...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001837
EISBN: 978-1-62708-241-9
... was the result of higher hardenability of coarse grains. On the basis of fractography and microscopic examination, the principal cause of brittle intergranular cracking in HAZ of weldment was weakening of grain boundaries due to grain coarsening at higher temperatures because of high welding heat input...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003546
EISBN: 978-1-62708-180-1
... temperature No interaction between the high- and low-temperature modes Carbides precipitate as M 23 C 6 on grain boundaries at high temperature. Carbide coarsening obeys Oswald ripening. Carbides are cracked at low temperatures by impingement of slip bands where the stress is concentrated...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001768
EISBN: 978-1-62708-241-9
...)) showing degenerated pearlite ( a ) ×200, ( b ) ×200 No significant grain coarsening could be observed adjacent to the white-etching layer. Regarding the galvanized layer, however, it was assumed that the same would have melted and re-solidified on exposure to heat. This observation was corroborated...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001031
EISBN: 978-1-62708-214-3
..., which caused ductility loss and grain-boundary separation. The excessive oxygen content in the liner was attributed to diffusion from an oxygen-rich environment that had resulted from nonuniform mixing of propellants. The internal oxygen embrittled the alloy and reduced its thermal conductivity, which...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006781
EISBN: 978-1-62708-295-2
... Fig. 9 Precipitate structure of René 80 cycled in strain-controlled low-cycle fatigue at 1254 K. Note the globular appearance and coarsening of the precipitates and the dislocation networks around the precipitates. The small precipitates have been consumed by the growth of the large ones. Source...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0045988
EISBN: 978-1-62708-235-8
... exhibited restored bend ductility and a refined grain size of ASTM 5 to 6. The specimen from the unfailed strap, originally a ductile material, fractured by cleavage and exhibited a coarsened grain size of ASTM 4. Transgranular-cleavage (brittle) fracture occurred across rivet holes in the clamp strap...