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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001671
EISBN: 978-1-62708-234-1
... Abstract Important clues about the probable cause of a gun tube explosion were obtained from a fractographic and metallographic examination of the fragments. The size, distribution, and surface markings of fragments may be used to localize the explosion and deduce its intensity. Microstructural...
Image
Published: 01 January 2002
Fig. 49 Piston for a gun-recoil mechanism, sand cast from ductile iron conforming to MIL-I-11466, grade D7003, that fractured in fatigue because of vermicularity of graphite. (a) and (b) Two different views of the piston showing fractures; A and B indicate orifices (see text). Approximately More
Image
Published: 30 August 2021
Fig. 27 Piston for a gun-recoil mechanism, sand cast from ductile iron conforming to MIL-I-11466, grade D7003, that fractured in fatigue because of vermicularity of graphite. (a) and (b) Two different views of the piston showing fractures; A and B indicate orifices (see text). Original More
Image
Published: 01 June 2019
Fig. 1 Piston for a gun-recoil mechanism, sand cast from ductile iron conforming to MIL-I-11466, grade D7003, that fractured in fatigue because of vermicularity of graphite. (a) and (b) Two different views of the piston showing fractures; A and B indicate orifices (see text). Approximately More
Image
Published: 01 June 2019
Fig. 1 Overall view of gun tube in which the failure was caused by deliberately detonating a high explosive projectile inside the tube. The failure is characterized by an intact muzzle section (forefront), large fragments to the rear of this area, fragments from the area of detonation More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0089657
EISBN: 978-1-62708-233-4
... Abstract The gun mount used in two types of self-propelled artillery consists of an oil-filled recoil cylinder and a sand-cast (MIL-I-11466, grade D7003) ductile-iron piston that connects to the gun tube through a threaded rod. The piston contains several orifices through which oil is forced...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0092135
EISBN: 978-1-62708-222-8
... thicker and more uniform, and/or developing an alternative nontoxic metal shot with a hardness in the range of 30 to 40 HB. Ammunition Guns 1138 UNS G11380 Gross yielding A standard commercial shotgun barrel fabricated from 1138 steel deformed during a test that was made with a new type...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047010
EISBN: 978-1-62708-234-1
... including a maraging steel (18% Ni, grade 250), a vanadium-modified 4337 gun steel (4337V), H19 tool steel, and high-temperature alloys Rene 41, Inconel 718, and Udimet 630. All the alloys evaluated had been used in mortar tubes previously or were known to meet the estimated minimum yield strength...
Book Chapter

By M. Pepi
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001910
EISBN: 978-1-62708-217-4
... Abstract Breech bolt assemblies from the Gatling guns used on fighter aircraft failed during firing tests. Metallography of the failed components revealed considerable decarburization which resulted in a loss of surface hardness. It was also determined that the maraging steel components were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046210
EISBN: 978-1-62708-235-8
... Abstract Several crankshaft failures occurred in equipment that was being used in logging operations in subzero temperatures. Failure usually initiated at a cracked pin oil hole, and the failure origin was approximately 7.6 mm (0.3 in.) from the shaft surface. The holes were produced by gun...
Image
Published: 01 June 2019
Fig. 7 Network of adiabatic shear deformation resulting from complex stress state in the gun during detonation. Etched in picral. More
Image
Published: 01 June 2019
Fig. 2 Sketch of assembled fragments on which the crack surface directions on individual fragments are shown pointing to the origin of failure (upper right) at the muzzle end of the gun tube. More
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Published: 15 May 2022
Fig. 64 Schematic diagram of time-of-flight secondary ion mass spectrometer/mass spectrometer (MS/MS). ESA, electrostatic analyzer; CID, collision-induced dissociation; SED, secondary electron detector; GCIB, gas cluster ion beam; FIB, focused ion beam; LMIG, liquid metal ion gun. Courtesy More
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006769
EISBN: 978-1-62708-295-2
... electrons from a tungsten filament are termed cold-field-emission SEMs, or high-resolution SEMs, and have the highest resolution capabilities of all SEMs. A compromise is reached in the thermal-field-emission (or Schottky gun) SEM when a combination of heat and electric field are used to produce an electron...
Book Chapter

By L.S. Chumbley, L.D. Hanke
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003533
EISBN: 978-1-62708-180-1
.... A compromise is reached in the thermal-field-emission (or Schottky gun) SEM, where a combination of heat and electric field are used to produce electrons. These machines have better resolution than conventional SEMs, while being easier to use than the high-resolution machines. A conventional SEM also...
Book Chapter

By S.J. Suess
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c9001622
EISBN: 978-1-62708-222-8
... spectrometer (SEM/EDS). The SEM allows for high-magnification study of surfaces by utilizing electrons instead of visible light. This instrument is equipped with magnetic lenses and coils, which scan the sample surface with electrons (primary electrons) that are emitted from an electron gun through a column...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006943
EISBN: 978-1-62708-395-9
.... The fundamental construction of the electron column is basically the same in various SEM instruments. The electron column consists of an electron gun, electron lenses, condenser lenses, and objective lenses, which are necessary to collimate and focus the electron beam for optimum operation of the instrument...
Book Chapter

By Lisa Swartz, John Newman
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006771
EISBN: 978-1-62708-295-2
... Depth Profiles Compositional depth profiling is possible with the use of auxiliary sputter ion guns. Several different options for ion sources are available and depend on the material to be depth profiled. All ion guns are used to slowly remove material, thus exposing a new surface to be analyzed...
Book Chapter

By R. Ahmed
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003563
EISBN: 978-1-62708-180-1
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003573
EISBN: 978-1-62708-180-1
... profile of inside diameter as shown in the “After test” curve in Fig. 7(a) . Comparison of this curve with the profile before the test shows that the effect of firing soft iron shot was to deform the gun barrel so that the choke taper was shifted toward the muzzle. After the test, there was a bulge...