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MnS inclusions

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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 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.aero.c9001489
EISBN: 978-1-62708-217-4
... observed inclusions were spinel solid solutions of the type MO middot; N2O3, where M = Fe, Mn, or Mg and N = Cr or Al. The detrimental inclusions were corundum, calcium aluminates, cristobalite, and silicates. The most detrimental phases were traced on the surfaces of the specimens fractured using impact...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001256
EISBN: 978-1-62708-218-1
... present in the inclusion are: Mn, Si, Cr and S. No Fe was found in the inclusion. The distributions of S and Si were not uniform along the length of the inclusion. Mn content was found to be very high in the inclusion, much in excess of the matrix.” The simple metallographic observations conclusively...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089793
EISBN: 978-1-62708-235-8
... main crack had propagated parallel to the fusion boundary along the subcritical HAZ and was associated with long stringers of type II manganese sulfide (MnS) inclusions. This supported the conclusion that the weld failed by lamellar tearing as a result of the high rotational strain induced at the root...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0090974
EISBN: 978-1-62708-235-8
...-and-tempered microstructure contained solidification shrinkage, inherently poor ductility, and type II Mn-S inclusions that are known to reduce ductility. The macro and microscale fracture features confirmed that the casting was likely in low-temperature service at the time of failure. The composition...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001687
EISBN: 978-1-62708-220-4
... located at the grain interior. At the interdendritic regions, bright NbC carbides were detected, together with M 23 C 6 , M 7 C 3 -type carbides and dark MnS inclusions. The dendritic region was found to extent from the outer to the inner diameter with the absence of equiaxial grains. Fig. 1...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001645
EISBN: 978-1-62708-232-7
... carried out on the failed roller-bearing and inner-race specimens in unetched condition to observe the characteristics of nonmetallic inclusions present. The roller-bearing sample showed numerous stringers of brittle angular alumina inclusions as well as sulfides with entrapped oxides. Few MnS inclusions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001607
EISBN: 978-1-62708-231-0
... Abstract Wire ropes, pulleys, counterweights, and connecting systems are used for auto tensioning of contact wires of electric railways. A wire rope in one such auto tensioning system suffered premature failure. Failure investigation revealed fatigue cracks initiating at nonmetallic inclusions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001603
EISBN: 978-1-62708-228-0
... in which sulfide inclusions were located. A pearlite phase was found on both sides of the ferrite band, similar to the observations made in the present investigation. According to the authors, MnS inclusions act as a preferable site for the ferrite nucleation, which starts at the interface between...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001615
EISBN: 978-1-62708-235-8
... nonmetallic inclusions in the central portion of the raw bar stock rather than the usual problem of improper forging temperature. Strict control over the inclusion content in the raw material by changing the vendor eliminated the problem. Forming defect Hot forging Nonmetallic inclusions Upset...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001557
EISBN: 978-1-62708-234-1
.... Fig. 3 Sub-surface discontinuous hairline cracks close to the bore surface, (as polished) at ×50 Fig. 4 Intergranular crack in the as-polished condition, at × 400 Fig. 5 Discontinuous intergranular cracks with Mn-sulphide inclusions along the path of cracking (2% Nital etched...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001561
EISBN: 978-1-62708-229-7
... S ions. The significance of the MnS stringer-like inclusions as pit nucleation sites is inconclusive. The results of Electrochemical Potentiokinetic Reactivation Analysis (EPR) did show at least one area of the pipe's cross section had been sensitized significantly by the welding process...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001378
EISBN: 978-1-62708-215-0
.... Unetched. 38× Fig. 3 General microstructure of stud bolt, showing gray MnS stringer inclusions running parallel to longitudinal bolt axis in tempered martensite matrix. Nital etch. 380× All cracks originated at the bottom of the threads. A grinding wheel test was conducted on the stud...
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
... analysis of corrosion deposit on rod #3 Metallographic sections were prepared from the tubing and the rods. The tube microstructure was composed of ferrite and poorly formed pearlite ( Fig. 16 ). Numerous inclusions were also observed and were most likely MnS. The hardness of the tubing material was...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0089696
EISBN: 978-1-62708-220-4
... cracks at slag inclusions and sharp fillets in weld-repair areas in the casting. The weld-repair procedures were unsatisfactory. The cracks propagated in a fatigue mode. he casting quality was judged unacceptable because of the presence of excessive shrinkage porosity. It was recommended that crosshead...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0045992
EISBN: 978-1-62708-225-9
... instead of the specified 55 to 60 HRC. Thus, the poppet failed by brittle fracture, and cracking occurred across nonmetallic inclusions. Recommendation was to redesign the valve with the poppet material changed to 4140 steel, hardened, and tempered to 50 to 55 HRC. Hardness Nonmetallic inclusions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001908
EISBN: 978-1-62708-235-8
... Abstract Cluster bomb tailcone assemblies each containing two aluminum die-cast components were rejected because of the poor surface condition of the die castings. Numerous heat checks were found on the surfaces of the tailcones and radiographic inspection revealed inclusions, gas holes, and...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001089
EISBN: 978-1-62708-214-3
... with the initiation of cracks at slag inclusions and sharp fillets in weld-repair areas in the casting. The weld-repair procedures were unsatisfactory. The cracks propagated in a fatigue mode. he casting quality was judged unacceptable because of the presence of excessive shrinkage porosity. It was...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001579
EISBN: 978-1-62708-226-6
... of a femoral fracture failed after only 16 days of service and before bone callus formation had occurred. The steel used for the implant met the requirements of ASTM Standard F138 but did contain a silica-alumina inclusion that served as the initiation point for a fatigue/corrosion fatigue fracture...
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
..., 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...