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spheroidization

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001186
EISBN: 978-1-62708-234-1
... of the fracture, but they had no effect on the breakage of the wire. Away from the fracture area, the wire had a normal structure of hyperfine lamellar pearlite (sorbite) of a “patented” and cold drawn steel wire. In the vicinity of the fracture, the cementite of the pearlite was partially spheroidized, while...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0090965
EISBN: 978-1-62708-221-1
... better spheroidal graphite morphology at the frame surface. Cone crushers Frames Graphitic structure 80-55-06 UNS F33800 Brittle fracture The upper frame from a large cone crusher failed in severe service after an unspecified service duration. The ductile iron casting was identified...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c0048830
EISBN: 978-1-62708-228-0
... of the weld in the coarsegrain portion of the HAZ. The microstructure was found to be severely embrittled and severely gassed in an area around the crack. The microstructure of the metal in the head was revealed to be banded and contained spheroidal carbides. The lower head was established by hardness values...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001592
EISBN: 978-1-62708-228-0
... been developed to control and avoid those failures. This study presents various failure cases of sucker rods in different applications. The heat treatment of the steel material and the resulting microstructure are an important factor in the behavior of the sucker rod. A spheroidized microstructure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048294
EISBN: 978-1-62708-234-1
... longitudinal splits were interpreted to have failed by stress rupture resulting from prolonged overheating at 540 to 650 deg C as the microstructure exhibited extensive spheroidization and coalescence of carbides. The larger ruptures were tensile failures that resulted from rapid overheating to 815 to 870 deg...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001454
EISBN: 978-1-62708-220-4
... spheroidized condition. There was no evidence of cracking of the material in the region of the blisters and bend tests demonstrated it possessed satisfactory ductility. The primary cause of the blistering was ascribed to the presence of discontinuities within the plate. This provided cavities in which...
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.power.c9001480
EISBN: 978-1-62708-229-7
... intergranular penetration by molten copper. Particles of copper were seen in scale deposits on the bore of the tube. The tube in general showed a ferritic structure with partially spheroidized carbide. The fact that fusion of the copper had occurred indicated temperatures of 1100 deg C (2012 deg F) had been...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0089534
EISBN: 978-1-62708-223-5
... was disclosed by metallographic examination to be case carburized. The case was found to be martensite with small spheroidal carbides while the core consisted of martensite plus some ferrite. The fracture was revealed to be related to shrinkage porosity. Tempering was revealed to be probably limited to about...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001337
EISBN: 978-1-62708-215-0
... of creep cracking and creep void formation at the fissure. A nearly continuous band of graphite nodules was observed on the surface of the fissure. In addition to the graphite band formation, the microstructure near the failure exhibited carbide spheroidization from long-term overheating in all the tube...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001105
EISBN: 978-1-62708-214-3
..., respectively. Visual examination of the bellows revealed cracks in heavily cold-worked areas (both inside and outside) and considerable corrosion. SEM analysis showed a classical intergranular failure pattern with microcracking. The threaded tie rod microstructure contained spheroidized carbide that was more...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001834
EISBN: 978-1-62708-241-9
... wall thinning low-alloy carbon steel spheroidization SEM backscattered electron analysis microstructural transformation T12 (chromium-molybdenum low-alloy carbon steel) Introduction Examined Sample Results and Discussion Discussion Conclusion Acknowledgment References...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0047343
EISBN: 978-1-62708-236-5
... ductile iron rotor. See also Fig. 2 , 3 , 4 , 5 , 6 , and . The microstructure of the rotor was examined in three regions. The shaft material consisted of spheroidal graphite in a matrix of ferrite with approximately 50% partially spheroidized pearlite ( Fig. 2 ). Because the shaft material...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001330
EISBN: 978-1-62708-215-0
... 580 °C (1075 °F). A spheroidized microstructure with graphite nodules indicated that tube 1 was operating at a temperature significantly above its oxidation limit and below its lower transformation temperature of 727 °C (1340 °F) for an extended period of time. Transformation products...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001688
EISBN: 978-1-62708-234-1
... a structure of ferrite and spheroidized pearlite with extensive decarburization at the outer surface ( Figure 1b ), and a lesser degree of decarburization at the inside. Fig. 1 (a) Microstructure of tube that had suffered less oxidation; (b) microstructure of tube with more oxidation (external surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048299
EISBN: 978-1-62708-229-7
... mm (8 in.) from the failure, and in the same plane as the failure but 180° around the perimeter of the tube. The structure at the failure was completely spheroidized carbides in a ferrite matrix ( Fig. 2a ). The samples from locations 2 and 3 are nearly normal ferrite and pearlite ( Fig. 2b and c...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001340
EISBN: 978-1-62708-215-0
... spheroidized. Fig. 5 Typical microstructure along the coldside of tubes 3 and 4 showing small colonies of lamellar pearlite in a ferrite matrix 2% nital etch. 244× Fig. 6 Cross-section through a fissure lip from tube 4.Note the preponderance of subgrains in the ferrite matrix due to distortion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046874
EISBN: 978-1-62708-229-7
... product that enclosed spheroidal carbide particles. The microstructure of the spring consisted of spheroidal carbide particles in a matrix of tempered martensite. The surface of the spring had been decarburized, and the surface grains were larger than those in the interior. This condition probably...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001322
EISBN: 978-1-62708-215-0
... of SAE-192 carbon steel contains ferrite and pearlite phases. However, the microstructure of tube 2 in the fracture area (as well as at some distance from the rupture), consisted of ferrite with grain boundary cementite or spheroidal carbides (Fe 3 C) and no pearlite phases. Occurrence...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c0048303
EISBN: 978-1-62708-236-5
... in.) outside diameter × 7.6 mm (0.300 in.) minimum wall thickness ASME SA-213, grade T-22, material. Figure 1(a) shows the failure. Fig. 1 2.25Cr-1Mo steel superheater tube that failed by creep. (a) As-received failure. (b) Microstructure of the whole tube section is spheroidized carbides in ferrite...