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Molybdenum, alloying additive

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001062
EISBN: 978-1-62708-214-3
... to a decrease in grain-boundary cohesion resulting from sulfur segregation. Addition of molybdenum proved effective in preventing cracking. The molybdenum promoted MnS precipitation in the grain and preferentially segregated to the interfaces. Brittle fracture Casting defects Castings Molybdenum...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001337
EISBN: 978-1-62708-215-0
... change that sometimes occurs in carbon and 0.5% molybdenum low-alloy steels subjected to moderately excessive metal temperatures 482 to 551°C (900 to 1025°F) for long periods of time ( Ref 1 ). Because the carbon in this steel as-manufactured is usually present in a metastable state as carbides, thermal...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001599
EISBN: 978-1-62708-236-5
... revealed the presence of an alloy containing nickel and molybdenum in several ingots found on the bottom of the melter and on a drip which had solidified on the electrode sheath. This indicates that a major portion of the electrode assembly was exposed to a temperature of at least 1317 deg C, the nickel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0006440
EISBN: 978-1-62708-234-1
... microscopy. The corrosion product contained molybdenum and copper with a trace of gold. The base material was analyzed as molybdenum with negligible alloying additions. The primary mode of corrosion attack on the base material appeared to be intergranular, although uniform corrosion was evident also...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001183
EISBN: 978-1-62708-223-5
... Abstract In a continuously cast aluminum press stud, two small foreign metal slivers were found that had caused difficulties with the cable sheathing press. Spectroscopic examination revealed the slivers consisted of a chromium-molybdenum-vanadium steel with minor (unintentional) additions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c0047570
EISBN: 978-1-62708-221-1
... flange and pipe end to eliminate the cracking. Fe-0.25C-0.98Mn-3.52Ni-1.34Cr-0.24Mo (Nickel-chromium-molybdenum alloy steel) Joining-related failures Brittle fracture A pipe in a chip conveyor cracked at the toe of an exterior fillet weld connecting a flange to the pipe. The chip conveyor...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001252
EISBN: 978-1-62708-235-8
... Abstract An octagonal steel ingot weighing 13 tons made of manganese-molybdenum steel developed gaping cross-cracks on all eight sides in the forging press during initial pressure application. It was reported that the steel had been melted in a basic 12-ton arc furnace, oxygenated, furnished...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c9001564
EISBN: 978-1-62708-230-3
... Abstract An 8 in. diam stainless steel black liquor feed pipe to a carbon steel digester had failed within one year of service. The material was type 316 molybdenum-containing austenitic stainless steel. The service environment was alkaline black liquor at 175 deg C (350 deg F). The pipe had...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0046995
EISBN: 978-1-62708-232-7
... oxidation. All 100x The tubes had an original wall thickness of 3.0 mm (0.120 in.) and were made of three different alloys. The first was Hastelloy X: Element Composition, % Nickel 48 Chromium 22 Iron 18.5 Molybdenum 9 The second alloy was RA 333, a wrought nickel-base...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001595
EISBN: 978-1-62708-235-8
.... The predominant additional elements of interest in hardenability calculations are manganese, silicon, nickel, chromium, molybdenum, copper, vanadium, and boron. The decrease in hardness as a function of depth depends primarily upon the combined effects of these alloying elements. Most other common steel alloying...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001344
EISBN: 978-1-62708-215-0
... banks are often installed because of their superior fireside corrosion resistance, excellent high-temperature strength, and relatively good weldability with chromium/molybdenum low-alloy steel tubing in the system. This particular tertiary superheating bank operates at 10.5 MPa (1500 psi), with a steam...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001685
EISBN: 978-1-62708-235-8
... reaction analysis [ 8 ]. Robinson et al., used tritium, which is the radioactive isotope of hydrogen that decays to helium, to demonstrate the concept of hydrogen isotope concentration enhancement at the tip of a blunt notch in the titanium-molybdenum alloy [ 9 ]. Another explanation that may be more...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001171
EISBN: 978-1-62708-219-8
..., in presence of deep interstices, as in our welded pipeline, these potentials can attain values considerably higher than above reported, especially in absence of molybdenum. As established in practice, the molybdenum, as alloying element, has a significant beneficial effect on overall corrosion behaviour...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001160
EISBN: 978-1-62708-220-4
... machines. Residual stresses can however be eliminated with certainty only by annealing after machining, if possible in a protective atmosphere. Since a molybdenum alloy austenitic steel is involved here, the annealing temperature should not lie below 1000° C, preferably between 1050 and 1100° C, followed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001133
EISBN: 978-1-62708-214-3
... Abstract A femoral knee implant was returned to the casting vendor for analysis after exhibiting poor bond strength between the cast substrate and a sintered porous coating. Both the coating and the substrate were manufactured from a cobalt-chromium-molybdenum alloy. Metallographic analysis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c0048830
EISBN: 978-1-62708-228-0
... Abstract A vessel made of ASTM A204, grade C, molybdenum alloy steel and used as a hydrogen reformer was found to have cracked in the weld between the shell and the lower head. Six samples from different sections were investigated. The crack was found to be initiated at the edge of the weld...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001213
EISBN: 978-1-62708-220-4
... were received 1 . Reportedly they were made of the stainless austenitic chromium-nickel-molybdenum steel X 5 CrNiMo 18 10 (Material No. 1.4401). According to an analysis by the Association for Technical Surveillance the cooling water at a pH-value of 6.6 to 6.7 contained 10.000 mg Cl′ and 1440 to 1520...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... of the specification, as listed in Table 1 . Table 1 Chemical Composition Weight Percent Element Failed Component Governing Specification Carbon 0.012 0.03 max. Nickel 18.5 18.0 – 19.0 Cobalt 9.12 8.5 – 9.5 Molybdenum 4.88 4.6 – 5.2 Titanium 0.65 0.50 – 0.80 Aluminum 0.12...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001620
EISBN: 978-1-62708-229-7
... surfaces to occur but with as low a coefficient of friction as possible. This can be accomplished by ensuring good lubrication between the faying surfaces. When a plain lubricant is ineffective in reducing fretting, the addition of low-friction-type material, such as molybdenum disulfide, to a liquid...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001330
EISBN: 978-1-62708-215-0
... an assessment of the degree of long-term overheating impossible. The superior oxidation resistance and microstructural stability of Grade T22 tubing, via its chromium and molybdenum additions, resulted in the virtual absence of significant scale and fine dispersion of spheroidal carbides in the microstructure...