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grain growth

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001598
EISBN: 978-1-62708-232-7
... Abstract The metallurgical condition of a cylindrical induction melter (CIM) vessel was evaluated after approximately 375 h of operation over a two-year span at temperatures between 1400 to 1500 deg C. Wall thinning and significant grain growth was observed in the lower portion of the conical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001443
EISBN: 978-1-62708-235-8
... and the resistance in a starter. A transverse section through the zone of failure showed an oxide layer extended almost completely across the plane of a weld, and also the grain growth that had occurred in this region. Butt welds Conductors (devices) Grain growth Weld defects Copper Joining-related...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... an alternative material with a lower notch sensitivity. In addition, the temperature at which this alloy is treated must be monitored to prevent coarse grain growth. As a result of this investigation and in an effort to eliminate future failures, ARL assisted in developing a cadmium brush plating procedure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001483
EISBN: 978-1-62708-225-9
... in between the bolt and the hole in the strip. The bolt end adjacent to the fracture had been subjected to intense local heating. The extent of the grain-growth indicating that the temperature had been in the region of 1200 deg C (2192 deg F). When the temperature reached the melting-point of copper, 1083...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047080
EISBN: 978-1-62708-235-8
... the conclusions that bending of the connector tubes in the annealed condition induced critical strain near the neutral axis of the tube, which resulted in excessive growth of individual grains during the subsequent solution treatment. Recommendations included bending the connector tubes in the T4 temper as early...
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
...) Metallographic profile of the weld near the cracking, showing melt-through, grain growth, and precipitation. 8.9×. (d) Grain-boundary precipitates in the weld zone. 119×. (c) and (d) were etched with Vilella's reagent followed by electrolytic etching in 10% oxalic acid. Investigation Examination...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... growth or overall grain growth Increases hardenability May cause variations in local hardenability May reverse normalization and increase local segregation or banding Preheat Behaves as stress relief Relieves prior stresses Machining Grinding Cold working/forming...
Image
Published: 01 June 2019
Fig. 1 Cracking of a welded ferritic stainless steel heat exchanger. (a) Diagram showing the heat-exchanger weld joint design. (b) The transverse crack that occurred through the weld. 5.9×. (c) Metallographic profile of the weld near the cracking, showing melt-through, grain growth More
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
... in Fig. 1 (labeled 0.012 to 0.017 in.), showed no grain coarsening. The metal near the outer surface (which was exposed to soot and to the endothermic atmosphere), before being overheated, had apparently undergone sufficient grain-boundary carburization to prevent subsequent grain growth in the outer...
Image
Published: 01 June 2019
Fig. 4 Photomicrograph of the sample sectioned from the CIM drain tube showing significant grain growth More
Image
Published: 01 June 2019
Fig. 7 Composite photomicrograph showing microstructure of the conical section from the CIM. Note significant grain growth and the lack of voids throughout the cross section. Molten glass attack is visible on ID surface, but no wall thinning occurred. More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001135
EISBN: 978-1-62708-219-8
... higher than specified by the ASTM standards. The fatigue crack growth rate through this area was much faster than expected. All of these property changes resulted from increased carbon levels, higher yield strength, and larger than normal grain size. Bridges (structural) Grain size Segregation...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001270
EISBN: 978-1-62708-215-0
... the forging process, which resulted in stagnant areas where grain growth occurred. Microscopic examination of the parts revealed large grain areas near the parting line. The rest of the forging showed a uniform grain structure. This stagnant or nonuniform material flow was caused by mismatch of the forging...
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
... of the used punch. Presence of a yellow porous layer was clearly evident between the nitrided layer and the coating, in case of the used punch. Cracks were observed to propagate from the outer surface into the bulk (see Figure 1a ). Oxidation was evident along the cracks. Also, extensive grain growth...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001816
EISBN: 978-1-62708-241-9
... phenomena described by the model and is also clear evidence of superplasticity. The role of precipitates is not limited to the formation of ultrafine microstructure during ATMCRP, but is also very important during high temperature tests as they prevent grain growth and maintain mechanical strength acting...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
..., probably caused by cast-in hydrogen. The intergranular appearance resulted from heat treatment of the already cracked part, which caused the formation of grain-boundary “growth figures” on the exposed crack surfaces. It was recommended that the castings be more closely inspected for defects before further...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001123
EISBN: 978-1-62708-214-3
... refinement, because aluminum would tend to segregate to the grain boundaries and impede grain growth. Aluminum, however, would oxidize under a humid atmosphere. From the surface layer to the interior, oxygen diffusion along the grain boundaries was aided by the presence of aluniinum. If the aluminum content...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001775
EISBN: 978-1-62708-241-9
... stresses, originating from in situ bend forming of the tube during assembly of the line, provided a driving force for crack growth, and the segregation of sulfur on grain boundaries made the material more susceptible to cracking. References References 1. Corrosion in the Petrochemical Industry...
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
... microstructural evolution as a function of elevated temperature may take many forms, the most common are grain growth and precipitate growth. Grain growth will occur as a function of grain-boundary movement in order to reduce the overall area of grain boundaries within the microstructure. Grain growth generally...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001800
EISBN: 978-1-62708-241-9
... observed in Fig. 3 . During the event there would be a significant temperature gradient in the arced zone resulting in the most grain growth at the hottest point (the exterior surface). The temperature gradient is estimated by: at least 1500 °C (melting) at the surface to <500 °C (no recrystallization...