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Precipitates
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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001217
EISBN: 978-1-62708-235-8
... Abstract In a housing made of cast steel GS 20MoV12 3, weighing 42 tons, precipitates were found on the austenitic grain boundaries during metallographic inspection. According to their shape and type they were recognized as carbides that precipitated during tempering. In addition, a much...
Abstract
In a housing made of cast steel GS 20MoV12 3, weighing 42 tons, precipitates were found on the austenitic grain boundaries during metallographic inspection. According to their shape and type they were recognized as carbides that precipitated during tempering. In addition, a much coarser network of rod-shaped and plate-shaped precipitates was found, that probably corresponded to the primary grain boundaries, or to the grain boundaries or twin planes of the austenite formed during solidification of the melt. These particles could have been aluminum nitride judging by their shape and order of precipitation. Tests showed that a subsequent removal of this defect by solutioning was impractical because the annealing temperature was too high. To avoid this defect in the future the sole recommendation is to accelerate the cooling rate through the critical region between 1200 to 900 deg C to such an extent as is practicable with respect to machinability.
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in Scaling of Resistance Heating Elements in a Through-Type Annealing Furnace
> ASM Failure Analysis Case Histories: Steelmaking and Thermal Processing Equipment
Published: 01 June 2019
Fig. 8 Precipitates under the scale layer, longitudinal section, unetched, phase contrast micrograph (−1). 100×
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in Scaling of Resistance Heating Elements in a Through-Type Annealing Furnace
> ASM Failure Analysis Case Histories: Steelmaking and Thermal Processing Equipment
Published: 01 June 2019
Fig. 9 Precipitates in the original structure of the heating strip, cross-section, etched in ferricyanide solution (after Murakami). 100×
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in Scaling of Resistance Heating Elements in a Through-Type Annealing Furnace
> ASM Failure Analysis Case Histories: Steelmaking and Thermal Processing Equipment
Published: 01 June 2019
Fig. 10 Precipitates under the scale layer, cross-section, etched in ferricyanide solution (after Murakami). 100×
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in Broken Back up Rolls from a Broad Strip Mill
> ASM Failure Analysis Case Histories: Steelmaking and Thermal Processing Equipment
Published: 01 June 2019
Fig. 8 Primary grain boundary with precipitates of ledeburite and secondary cementite. Etched in picral. 200 ×
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in Examination of Steel Specimens from an Ammonia Synthesis Installation
> ASM Failure Analysis Case Histories: Chemical Processing Equipment
Published: 01 June 2019
Fig. 2 Oxide precipitates in the decarburized zone of the pipe according to Fig. 1 . Unetched transverse section. 200 ×
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in Steel Casting with Insufficient Strength Properties
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 6 Precipitates on lattice planes and twin planes of former austenite. Etch: Picral. approx. 420 ×
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in Steel Casting with Insufficient Strength Properties
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 7 Precipitates in grain boundaries and planes, unetched section of outer zone of flange disk. 1500 ×
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in Steel Casting with Insufficient Strength Properties
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 8 Precipitates in grain boundaries and planes, unetched section of outer zone of flange disk. 1500 ×
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in Steel Casting with Insufficient Strength Properties
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 9 Aluminium nitride precipitates in transmission lacquer replica. 40 000 ×
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in Cast Ingot Cracked During Forging
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 7 Crack and precipitates at primary grain boundaries. Unetched longitudinal section. 100 ×
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in Cast Ingot Cracked During Forging
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 8 Grain boundary precipitates in polarized light. Longitudinal section. 1200 ×
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in Cast Ingot Cracked During Forging
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 10 Precipitates in carbon film of fracture. 5000 ×
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in Cast Steel Housing with Grain Boundary Precipitates
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 3 Precipitates stripped from fracture plane. 20 000 ×
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in Boiler Tube Cracked During Bending
> ASM Failure Analysis Case Histories: Processing Errors and Defects
Published: 01 June 2019
Fig. 6 Oxide precipitates at austenitic grain boundaries 3 mm under surface, etch: Nital.200 ×
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Published: 01 December 1992
Fig. 4 Higher-magnification view of tube surface, showing carbide precipitates inside grains and at grain boundaries, with oxide attack at surface. Etched with Vilella's reagent. 380×.
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Published: 01 December 1992
Fig. 5 Microstructure away from tube surface, showing grain-boundary precipitates of chromium carbide (white, outlined) . Etched with Vilella's reagent. 950×.
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in Degradation of a Main Combustion Chamber Liner on a Space Shuttle Main Engine
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1992
Fig. 6 TEM micrographs of silver precipitates in the matrix taken from a location near the electrodeposited copper interface where precipitates are semicoherent (a), and the hot-gas wall where precipitates are incoherent (b). Coherency determined by selected-area diffraction patterns. 53,000×.
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in Cracking of Inconel 800H in a Steam Methane Reformer Furnace
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1993
Fig. 6 Photomicrograph showing close-up of crack at toe of weld. Note precipitates within weld metal. 63×
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Published: 01 December 1993
Fig. 7 Micrograph showing grain boundaries with carbide precipitates and a homogeneous precipitation of gamma phase. inside the grains.
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