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spheroidizing

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Published: 01 June 2019
Fig. 2 Spheroidized carbides in ferrite matrix in the ruptured stub. Nital 1% etch. More
Image
Published: 01 June 2019
Fig. 8 Unetched micro-section of a cracked pump casing of austenitic spheroidal graphite cast iron. 100 × More
Image
Published: 01 June 2019
Fig. 3 Optical metallograph of ductile cast iron showing the spheroidal graphite phase in a ferrite matrix. 250× More
Image
Published: 01 December 1992
Fig. 2 Microstructure of the tie rod. Tempered martensite with spheroidized carbide. 250×. More
Image
Published: 01 December 2019
Fig. 4 SEM Micrograph of spheroidized pearlite in the substrate of the examined tube More
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
... 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 C...
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.chem.c9001454
EISBN: 978-1-62708-220-4
.... Some of the blisters were pierced by drilling a hole in the center and at the same time applying a small flame. In several cases combustion of the escaping gas caused minor explosions, a result characteristic of hydrogen. Etching showed the material to be a low-carbon steel in the partly spheroidized...
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
... 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 and microscopic...
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
... 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 presents...
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
... 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 150 deg C...
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
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001480
EISBN: 978-1-62708-229-7
... 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 experienced...
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
... 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 as grade 80-55...
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
... 3.30 Note: Due to the use of different analysing methods, the constituents of the bellows exceed 100%. Fig. 2 Microstructure of the tie rod. Tempered martensite with spheroidized carbide. 250×. Fig. 1 SEM fractograph of the fractured face of the bellows, showing grain facets...
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
... Photomicrograph showing a close-up of two graphite nodules and carbide spheroidization typical of the mid-wall microstructure of the tube. Nital etch. 285× Fig. 1 The external surface of the submitted superheater tube. 0.46× Fig. 2 The fissure oriented at 45° on the outer diameter surface...
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
... 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 would not be directly exposed to the high-temperature gas, it would be most representative of the rotor...
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
... suffered less oxidation had a structure of ferrite and lamellar pearlite across the wall ( Figure 1a ) while the others had 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...
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
...× Fig. 10 Photomicrograph of the mid-wall microstructure opposite the tube 2 failure. Note the spheroidal carbides and pearlite islands. Nital etch, 285× Fig. 11 Photomicrograph of the tube 2 mid-wall microstructure on the failure side, in the non-failed portion opposite the weld. Nital etch...
Image
Published: 01 June 2019
Fig. 6 Microstructure of the rotor housing. (a) General microstructure. 100x. (b) Ferritic matrix with spheroidized pearlite. 500x. Both etched with nital More