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tungsten carbide

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Published: 01 June 2019
Fig. 11 EDS spectrum of tungsten-rich region in alloy carbide segregate More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047598
EISBN: 978-1-62708-217-4
... tungsten arc welded tailpipes should be postweld annealed by re-solution treatment to redissolve all particles of carbide in the HAZ. Also, it was suggested that resistance seam welding be used, because there would be no corrosion problem with the faster cooling rate characteristic of this technique...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001535
EISBN: 978-1-62708-232-7
... in the BSE image is essentially V-rich, see Fig. 10 . The chain-like carbide segregation, which is associated with the triangular V-rich carbide, appears to be essentially Cr-rich, although it does contain varying amounts of V, W, and Mo. The molybdenum and tungsten x-ray mapping images shown in Fig. 10...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0091533
EISBN: 978-1-62708-217-4
... that is less susceptible to intergranular carbide precipitation. Aircraft components Carbide precipitation Clamps Sensitization 19-9 DL UNS S63198 Stress-corrosion cracking The clamp shown in Fig. 1(a) was used for securing the hot air ducting system on fighter aircraft. The strap was 0.8 mm...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001829
EISBN: 978-1-62708-241-9
... chromium-rich carbides that were generated during weld regeneration. In the welding process, the filler metal is Haynes 188, a solid-solution-strengthened superalloy having low-carbon and high-tungsten contents. Therefore, one can infer that there are mechanical and chemical differences between base...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001755
EISBN: 978-1-62708-241-9
...; aligned carbides in the matrix of tempered martensite Fig. 9 Cracks in the IRA Fig. 1 Schematic showing the ball bearing in cross section Fig. 2 Failed bearing assembly Fig. 3 Split rings of inner race showing fracture area Fig. 4 The IRA. (a) Fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046874
EISBN: 978-1-62708-229-7
... uniformly loaded, predominantly in torsion, but that the fatigue cracks had introduced stress raisers at multiple points. Chemical analysis of the metal in the spring disclosed that it was within the composition range for H21 tool steel, except that the tungsten content was 7.8% instead of the usual 9 to 10...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001280
EISBN: 978-1-62708-215-0
... cavities at carbide interfaces. Cavity alignment follows dendritic arms. Fig. 4 Polished and lightly etched view of the longitudinal section across the failed weld. Fig. 1 Schematic of the continuous arrangement of the reformer furnace tubing. Fig. 2 Specimen taken from...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001357
EISBN: 978-1-62708-215-0
... Fig. 6 Same section shown in Fig. 5 , revealing the characteristic grain size and distribution Fig. 7 Micrograph showing grain boundaries with carbide precipitates and a homogeneous precipitation of gamma phase. inside the grains. Fig. 8 Microstructure in a section perpendicular...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001667
EISBN: 978-1-62708-235-8
..., is presented. As an example, the materials and metallographic techniques employed in an actual on-site investigation of a gas tungsten-arc weldment joining two large diameter Ti-6Al-4V alloy cylinders are discussed in depth to illustrate what can be accomplished. Cylinders Field Metallography Welded...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001351
EISBN: 978-1-62708-215-0
... an autogenous gas tungsten arc welding process. Microhardness measurements indicated that the bellows had not been adequately stress relieved. It was recommended that a complete stress-relieving treatment be applied to the formed bellows. Improvement of storage conditions to avoid direct and prolonged contact...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001646
EISBN: 978-1-62708-219-8
... reduction in deformation. Inadequate lubrication or breakdown of the lubrication film during wire drawing results in greater friction due to metal-to-metal contact between the steel wire and the tungsten carbide die. This may lead to local heating of the wire surface and its abrupt cooling...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0091362
EISBN: 978-1-62708-220-4
...) supported the conclusion that failure of the nozzle weld was the result of intergranular corrosion caused by the pickup of interstitial elements and subsequent precipitation of chromium carbides and nitrides. Carbon pickup was believed to have been caused by inadequate joint cleaning prior to welding...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003545
EISBN: 978-1-62708-180-1
... deformation, including stress-rupture fractures. It also describes metallurgical instabilities, such as aging and carbide reactions, and evaluates the complex effects of creep-fatigue interaction. The article concludes with a discussion on thermal fatigue and creep fatigue failures. aging carbide...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006780
EISBN: 978-1-62708-295-2
... (such as lead, tin, and high-purity aluminum) can deform by creep at or a little above room temperature. In contrast, refractory body-centered cubic metals (such as tungsten and molybdenum) and nickel-base superalloys require temperatures near 1000 °C (1830 °F) to activate the onset of creep deformation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001712
EISBN: 978-1-62708-234-1
... occurring along with modest decarburization. Metallography The following observations were made regarding the two rolls: Roll #1 Shaft: coarsened, angular, eutectic-looking primary carbides coarsened, angular secondary carbides-moderately dissolved Body: 1D...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
.... Source: Ref 11 The mechanisms occurring in a given impact case are determined by the stress and sliding conditions within the contact. For example, in high-strength tungsten carbide bits of rock drilling equipment, surface fatigue leads to the formation of spalls ( Ref 12 ). Repetitive impact...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... chrome combines with available carbon to form chrome carbides along the grain boundaries, twin lines, and slip lines. This depletes the surrounding area of chrome, lowering the corrosion resistance. The temperature required is 425 to 815 °C (800 to 1500 °F). An area some distance from a weld could...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006808
EISBN: 978-1-62708-329-4
... porosity, slag inclusions, cracks, incomplete penetration, lack of fusion, and tungsten inclusions. On a radiograph, a pore appears as a round or oval dark spot with or without a rather sharp tail. The spots caused by porosity are often of varying size and distribution. A wormhole appears as a dark...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003517
EISBN: 978-1-62708-180-1
... and graphitization that can occur in carbon steel when exposed to heating at 540 °C (1000 °F). The addition of chromium together with other strong carbide formers, such as tungsten, vanadium, molybdenum, niobium, and titanium, tends to stabilize the carbide constituent so that it does not ultimately revert...