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grain coarsening

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Image
Published: 01 December 2019
Fig. 10 Microstructure of damaged sample showing grain coarsening, 100× More
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
... 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 was determined...
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
.... 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, the blow pipe...
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
... 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 the heat input...
Image
Published: 01 December 2019
and grain coarsening, ( d ) matrix structure shows formation of voids at the grain boundaries, and ( e ) microstructure away from the bulged zone shows banded ferrite–pearlite matrix More
Image
Published: 01 June 2019
Fig. 1 Photograph showing transformed microstructure (a) with crack (350×), (b) grain coarsening (600×). More
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
... 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 to grain size, composition, etc., appears...
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
...-grain microstructure of the alloy (ASTM grain size 4 to 7, but predominantly 5 to 7). Discussion 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 micrograph of specimen 1, as shown in Fig. 1...
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
...-base superalloy metal loss wall thinning grain coarsening stereomicroscopy temperature Incoloy 800 (nickel-base superalloy) UNS N08800 Introduction and Background Information The fire tube sleeve of the Heater Treater ruptured while the unit was operating under normal conditions where...
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.c9001269
EISBN: 978-1-62708-215-0
... austenite, untempered martensite, grain coarsening, surface decarburization or localized burning associated with the TiN coating at the surface. The cellular carbide networking is indicative of insufficient hot working to disperse, refine and homogenize the carbide structures formed when producing...
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
... of overheating like grain coarsening, grain boundary thickening, or dissolution of the strengthening precipitates, etc. The samples also revealed solution-treated and aged structures which were similar to that noticed in the samples sectioned from the other locations in the blades. Micro examination...
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
... 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 region...
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
... in solution. Tubes that operate in the temperature range below 480 °C (896 °F) should not form carbides in several years. High temperatures would also induce age hardening and grain coarsening. The total effect would be to deplete the chromium content of the alloy, particularly at the grain boundaries...
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
... in the ruptured 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...
Image
Published: 01 January 2002
Fig. 33 AISI 1040 steel bar austenitized at 913 °C (1675 °F) for 30 min, then cooled slowly in a furnace. White areas are ferrite; dark areas are pearlite. Mixed grain size due to heating into the coarsening range is also observed. Source: Ref 4 More
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
... and exhibited a coarsened grain size of ASTM 4. Conclusions Transgranular-cleavage (brittle) fracture occurred across rivet holes in the clamp strap closest to one edge of the pin retainer. Coarse grain size (ASTM 2 to 3) was responsible for the brittle fracture. Excessively high temperature during...
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
... — 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 in the manner seen giving fractures having...
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
... 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 resulted...
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
... (1700 °F) ( Fig. 6 ). Carbon adsorption and diffusion into the metal matrix induce the formation 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...