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sulfide inclusions

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001126
EISBN: 978-1-62708-214-3
... metal oxide and covered on the back surfaces with an adherent black polyethylene plastic. Macro fractography, SEM fractography, EDX analysis, and photo elasticimetry were conducted on four of the shattered panels. Small nickel sulfide inclusions were found at the failure origins. Failure of the panels...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001780
EISBN: 978-1-62708-241-9
...Abstract Abstract A number of failures involving carbon and alloy steels were analyzed to assess the effects of inclusions and their influence on mechanical properties. Inclusions, including brittle oxides and more ductile manganese sulfides (MnS), affect fatigue endurance limit, fatigue crack...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047860
EISBN: 978-1-62708-218-1
... four of the main-bearing journals. A crack along the fillet, almost entirely through the web, was observed in one of the main-bearing journals. Numerous coarse segregates, identified as sulfide inclusions, were identified by macroetching the surface during metallographic examination of a section taken...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001289
EISBN: 978-1-62708-215-0
... was made. Subsurface cracks were found to be zigzag and discontinuous as well as intergranular in nature. A mixed mode of fracture involving ductile and brittle flat facets was observed. Micropores and rod-shaped manganese sulfide inclusions were also noted. The material had a hydrogen content of 22 ppm...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0089254
EISBN: 978-1-62708-225-9
...-open fracture surface (b) of failed wedge-shaped middle tapered ring. 6× Fig. 5 Higher-magnification view of fracture surface shown in Fig. 12 at origin of cracking. Arrows indicate large manganese sulfide inclusion at origin. Chemical analysis of the material revealed a resulfurized...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089338
EISBN: 978-1-62708-224-2
.... The directionality of the features was found to be suggestive of shear overload. It was observed that fracture preferentially followed the nonmetallic inclusions. The fracture was revealed to be parallel to the direction of the manganese sulfide stringer inclusions. The presence of significant banding of the ferrite...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001489
EISBN: 978-1-62708-217-4
... (Mn, Cr, Fe)S inclusions were present along with spinels. The nondeformable, rigid oxide particles are considered more undesirable than the sulfides as far as fatigue life of the component is concerned. It has been reported that the presence of sulfides may eliminate the stresses due to oxides...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047779
EISBN: 978-1-62708-223-5
... in section resulted in a stress concentration that, in conjunction with the oxide-sulfide inclusion that intersected the surface of the fillet, initiated a crack. New shafts were made with a 2.4-mm (0.09-in.) radius fillet at the critical change in section (“Improved design,” Section A-A, Fig. 1...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001787
EISBN: 978-1-62708-241-9
... and location of the inclusions influence the material fatigue life. The inclusions with small size in the material surface obviously reduce the fatigue life. The inclusions in the matrix with large size will exert relatively small influence on the fatigue life [ 13 ]. The oxide inclusion, sulfide inclusion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001206
EISBN: 978-1-62708-235-8
... ); their origin is probably due to the inclusions precipitated at the austenite grain boundaries ( Fig. 8 ). These inclusions are optically isotropic and, judging by their shape and color, appear to be sulfides of manganese. These manganese sulfides exhibit an elongated shape in the longitudinal section taken...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001819
EISBN: 978-1-62708-241-9
... steel, failed by fatigue fracture, and the other, made of 316 austenitic stainless steel, experienced a similar fracture, which was promoted by the presence of nonmetallic inclusion particles. pump shafts fracture sulfide inclusions stainless steel fatigue striations cleavage microstructural...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001286
EISBN: 978-1-62708-215-0
... was similar to the microstructure in the disc wall, which is typical of a cast material. A typical unetched cross section of the 6.4 mm (0.25 in.) radius fillet displayed small, round manganese sulfide inclusions (average diameter ∼5 µm), no free massive carbides, and more than 90% types I and II graphite...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0047181
EISBN: 978-1-62708-233-4
... the compositional requirements of SAE 4140, the sulfur level was 0.022% and would account for the formation of the sulfide stringers observed. Apparently, the combination of the clustered, stringer-type inclusions and the quenching conditions were too severe for this component geometry. The result was a high...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047315
EISBN: 978-1-62708-225-9
... pearlite matrix, large graphite flakes (arrow A), manganese sulfide inclusions (arrow B), and silicate inclusions (arrow C). Etched with nital. 150× Investigation Discussion Conclusions Recommendations Selected References Selected References • Becker W.T. and McGarry D...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001300
EISBN: 978-1-62708-215-0
... metallographic techniques. The microstructure of the gear, shown in Fig. 11 , consists of tempered martensite with a few scattered manganese sulfide inclusions, typical of AISI 4140 in the quenched-and-tempered condition. The microstructure in the case-hardened region of the gear tooth, shown in Fig. 12...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001784
EISBN: 978-1-62708-241-9
... wrench socket was determined to be ductile fracture. Large number of spherically shaped loose iron (or iron oxide) particles were observed on the fractured surface indicating poor sintering step in the PM manufacturing process. Sulfide inclusions in dimples located at regions with plastic deformation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001165
EISBN: 978-1-62708-234-1
.... In the attacked zone, corrosion took place along the phase boundary graphite/matrix ( fig. 4 ) in the normal structure as well as in the supercooled one. It oxidized the ferrite and pearlite of the matrix selectively while the graphite, the ternary phosphide eutectic steadide, and the sulfidic inclusions were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0045903
EISBN: 978-1-62708-223-5
..., and metallographic examination revealed a basic microstructure of pearlite and ferrite with bands of slightly finer pearlite, with a large concentration of inclusion stringers in the area of the fracture origin. Further investigation using an energy-dispersive x-ray analyzer showed high concentrations of sulfur...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047118
EISBN: 978-1-62708-235-8
... in the longitudinal (working) direction. The inclusions were crumbled (fragmented) during forging, but were not deformed. The particles consisted primarily of aluminum oxide or silicates rich in aluminum oxide. Inclusions of this type could not be found in the interior of the cross section; only oxide and sulfide...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048120
EISBN: 978-1-62708-225-9
... of longitudinal specimens. Delaminations that were formed at inclusion sites during punching of the rivet holes and that were filled with nickel during the plating operation were revealed by microscopic examination of the rivet hole. These delaminations were interpreted to have acted as stress raisers...