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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.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.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.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
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001712
EISBN: 978-1-62708-234-1
... from the I.D. outward. Oxidation at the O.D. and I.D. surfaces was also occurring along with modest decarburization. The following observations were made regarding the two rolls: Roll #1 Shaft: coarsened, angular, eutectic-looking primary carbides coarsened, angular secondary...
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
... in practice. Fig. 5 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 growth of the large ones...
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.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: 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 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
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001031
EISBN: 978-1-62708-214-3
...) was used to determine the microstructure of the silver precipitates. Figure 6 shows the size and distribution in the bulk material, away from the hotgas wall and banded region. Figure 6 shows a similar structure near the hot-gas wall. As shown, the silver precipitates coarsened near the hot-gas wall...
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
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001479
EISBN: 978-1-62708-229-7
... steel along the grain boundaries — a process which is facilitated by the presence of a tensile stress. By penetration in this manner, especially when the grains of the steel have coarsened, a small amount of molten metal is enabled to result in rapid and severe loss of cohesion and ultimate failure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001155
EISBN: 978-1-62708-223-5
... of the core was some-what coarsened but still corresponded to the normal condition of the material 16 Mn Cr5 in the quenched and tempered state ( Figs. 4 ). The microstructure of the case showed no sign of any defect which could have led to the fracture ( Fig. 5 ). Irregularities and crack-like grooves were...
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.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...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001107
EISBN: 978-1-62708-214-3
... of chromium carbides, first intergranularly and then within the grains. Excessive formation and coarsening of these carbides lead to matrix consumption and subsequent transformation to ferrite and graphite. Stresses generated by phase transformations promote decohesion of metal particles and graphite...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001590
EISBN: 978-1-62708-228-0
... cracking unless the alloy is given a post fabrication heat treatment. The temperature, optimized for each alloy, eliminates the effects of retained cold work and welding stresses; coarsens the grain boundary precipitates; minimizes any Cr gradient adjacent to the grain boundary, which may have resulted...