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Nonmetallic 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.c9001790
EISBN: 978-1-62708-241-9
... nonmetallic inclusions near the fracture initiation site. Fracture mechanics analysis indicated that, if stresses acting on the shaft were induced only by normal service loads, there was little likelihood that the inclusions served as failure initiation sites. Further examination of the bearing elements...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001326
EISBN: 978-1-62708-215-0
... axes. SEM examination revealed the presence of longitudinally oriented nonmetallic inclusions that were partly retained and partly dislodged. Electron-dispersive x-ray analysis indicated that the inclusions were composed of CaO. Based on the overall chemistry of the inclusion sites, the source of the...
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
... 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
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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001616
EISBN: 978-1-62708-229-7
... species on the tubes in Stage 3. The complete failure of the tube occurred due to diffusion of these elements into the base metal and precipitation of potassium and chlorine compounds along the grain boundaries, with subsequent dislodging of grains. The nonmetallic inclusions acted as nucleating sites for...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c0089766
EISBN: 978-1-62708-224-2
... final machining. Carrier vehicles Chassis Fillet welds Flanges Inclusions Joint design Nonmetallic inclusions Posheating Stress relieving Tubes Welded joints 4140 UNS G41400 1025 UNS G10250 Fatigue fracture Joining-related failures Two tubular steel posts in a carrier vehicle...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0091358
EISBN: 978-1-62708-233-4
.... Recommendations included changing the valve material to type 304 stainless steel. Nonmetallic inclusions Sulfides Valves Vending machines 303 UNS S30300 Intergranular corrosion After about two years in service, a valve in contact with a carbonated soft drink in a vending machine occasionally...
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
.... Loading is vertical in the image Nonmetallic inclusions are known to have a deleterious effect on fatigue resistance, in general [ 6 , 10 , 13 ], and they can have a greater effect than composition, microstructure, or stress gradients [ 6 , 10 ]. However, it has been stated that nonmetallic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001422
EISBN: 978-1-62708-229-7
.... Boilers Leakage Nonmetallic inclusions Oxides Slags Welded steel Joining-related failures Fatigue fracture Corrosion fatigue During a hydraulic test on one of the boilers in a range, leakage occurred from the lower surface of a horizontal “S” bend in the main steam pipe between the drum...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006759
EISBN: 978-1-62708-295-2
... nonmetallics. Advances in chemical analysis methods for failure analysis are also covered. bulk analysis chemical analysis failure analysis microscale analysis thermal analysis CHEMICAL ANALYSIS is a critical part of any failure investigation. With the right planning and proper analytical...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001412
EISBN: 978-1-62708-229-7
... teeth. Non-metallic inclusions in the blade material playing a minor part. Cracking (fracturing) Loads (forces) Nonmetallic inclusions Stresses Turbine blades Vibration Ferritic stainless steel (Other, general, or unspecified) fracture The failure described occurred in a 45,000 kW...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001381
EISBN: 978-1-62708-215-0
... conformed to AISI E4340 steel, as specified. The microstructure was tempered martensite, with hardness ranging from 41 to 45 HRC. Failure was in the shear ductile mode. The crack initiated in the area of slag inclusions. Inspection of other bolts from the same shipment was recommended. Nonmetallic...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001299
EISBN: 978-1-62708-215-0
... for cracks during periodic maintenance overhauls. Aerospace engines Airplanes Nonmetallic inclusions 4340 UNS G43400 Fatigue fracture A steel piston engine crankshaft in a transport aircraft failed catastrophically during flight. Visual examination...
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
... 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.matlhand.c0048060
EISBN: 978-1-62708-224-2
... acicular structure, indicating that the material was in the as-forged condition. Light segregation and nonmetallic inclusions were present, but the material was considered sound. Fracture of the hook resulted from fatigue cracking that originated at stress concentrations in the root of the last thread...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001795
EISBN: 978-1-62708-241-9
... and tempered) structure consisting of uniform distribution of fine carbides. The microstructure of these bearing components was apparently free from any metallurgical abnormalities. The inclusion rating of the outer ring of the failed bearing was within the limits of nonmetallic inclusions...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001361
EISBN: 978-1-62708-215-0
... with a scanning electron microscope (SEM). The smooth “oyster shell” areas ( Fig. 5a ) on the fracture surface displayed faint fatigue striations throughout, some of which are shown in Fig. 5(b) . The surface was also found to contain secondary cracks between some of the nonmetallic inclusions ( Fig...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001042
EISBN: 978-1-62708-214-3
... revealed the material to be sound. No lamination was found, only minor nonmetallic inclusions that are normal in a stainless steel. Failure occurred in a leaf spring attached to the undercarriage assembly of an airport shuttle train. The spring linked the train with the rail, supplying the electrical...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001116
EISBN: 978-1-62708-214-3
... in Fig. 5 and 6 . Although shaped like a hook crack, the secondary crack was jagged and discontinuous. It lay in bands of hard-appearing microstructural constituent. The upturned fibers adjacent to the bond line contained no nonmetallic inclusion networks. Fig. 4 Matched fracture face cross...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001365
EISBN: 978-1-62708-215-0
... nonmetallic inclusions. Fig. 6 Photomicrographs showing the typical microstructure of the impeller at an undamaged area. The microstructure consists of tempered martensite, alloy carbides, ferrite, and nonmetallic inclusions. Etched in Vilella's reagant. (a) 77×. (b) 616× Samples representing...