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MnS inclusions

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Published: 01 January 2002
Fig. 10 Debonding associated with a MnS inclusion in a bainitic microstructure. Loading direction indicated. Source: Ref 30 More
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
... showed the 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...
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.process.c0090974
EISBN: 978-1-62708-235-8
.... The quenched-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...
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
... frequently 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...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001302
EISBN: 978-1-62708-215-0
... processing. Fig. 6 Optical micrographs of the spool region of failed kingpin. (a) Away from the site of the failure. This view shows MnS stringers typical of those seen in wrought steel products. Not etched. (b) Close to the site of the failure. This view shows the globular MnS inclusions associated...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001037
EISBN: 978-1-62708-214-3
... stress raisers at “A” and the rough machining on surface “B.” Metallography Microstructural Analysis The core ( Fig. 3 ) had a banded microstructure of ferrite and pearlite and contained some MnS inclusions. The case ( Fig. 4 ) showed a tempered martensite matrix with a nearly continuous...
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
... a specimen was subjected to electronprobe microanalysts. The result was as given below: “The elements found to be 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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001597
EISBN: 978-1-62708-236-5
... source of the failure and thus no continued analysis to pin down and eliminate the root cause. Continuous cast steel Induction hardening MnS inclusions Segregation Woody fracture 1548 (mod) Fatigue fracture Failure analysis has long been a special field of study for metallurgical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001141
EISBN: 978-1-62708-227-3
... inclusions in the base of the elongated depressions. Fig. 13 Fracture surface showing fern-like pattern of inclusions. The inclusions are composed mainly of Mn and S and from their flat elongated form can be identified as Type II MnS inclusions. A shear wall between two terraces is seen in Fig...
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
... was ferrite and pearlite with numerous inclusions dispersed throughout the structure ( Fig. 5 ). The inclusions were analyzed as MnS particles. The inclusions were elongated parallel to the rod length and contained numerous micro-cracks. Additionally, the inclusions provided preferential sites for pitting...
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
.... According to the authors, MnS inclusions act as a preferable site for the ferrite nucleation, which starts at the interface between the matrix and MnS. The volume fraction of inclusions in the vicinity of the crack (fusion zone) and away from the crack (PM) was determined to be 0.15 and 0.14...
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
... in a section through the end crater, Etch: nital. 50 × Fig. 6 As Fig. 5 . 200 × Fig. 7 As Fig. 5 . 500 × Fig. 8 MnS inclusions and ferrite network at the austenite grain boundaries in longitudinal section through the starting point of the weld seam, Etch: picral. 500...
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
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001820
EISBN: 978-1-62708-241-9
... the metal and those cracks that connect with the HIC cracks are able to grow more rapidly [ 7 , 8 ]. Fig. 7 SEM micrograph showing combined SSC and HIC corrosion crack growth Figure 8 shows microcracks that nucleated from an elongated FeS and extended from an acicular MnS inclusion. Stress...
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
... was 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.aero.c9001555
EISBN: 978-1-62708-217-4
... One main undercarriage axle made of high strength alloy steel (C 0.33%, Cr 1.15%, Ni 1.50%, Mn 1.05%, Si 0.96%) was subjected to simulated fatigue test for 6000 hours of service. But only after 300 hours it prematurely broke into two along the sharp radius ( Fig. 1 ). Fig. 1 Line of breakage...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001096
EISBN: 978-1-62708-214-3
... jagged areas) and MnS 2 inclusions (round gray spots) are visible. Unetched. 154×. Fig. 4 Higher magnification, etched view of Fig. 3 , showing crack (large black jagged area at top left), pearlite (black irregular fuzzy areas), and probably iron carbide precipitates (scattered jagged lines...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001679
EISBN: 978-1-62708-229-7
... found in the matrix were either chromium (Cr) and manganese (Mn) rich or manganese sulfide (MnS) inclusions ( Figures 14 and 15 ). Because of problems with thinning, the particles in Figure 14 could not be identified with diffraction patterns. Since Cr is a ferrite stabilizer, it is likely...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001532
EISBN: 978-1-62708-232-7
..., (c) Si x-ray map, (d) Cr x-ray map, and (e) Ni x-ray map; magnification 180× The EPMA investigations of typical NMIs present in the spalled HSM roll samples revealed the existence of both TiN- and MnS-type inclusions. The BSE and x-ray dot mapping images of a typical TiN associated MnS...