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Investment castings

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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.c9001029
EISBN: 978-1-62708-214-3
...Abstract Abstract Two investment-cast A356 aluminum alloy actuators used for handles on passenger doors of commercial aircraft fractured during torquing at less than the design load. Visual examination showed that cracking had occurred through a machined side hole. Fractography revealed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001074
EISBN: 978-1-62708-214-3
... shrinkage cavities. Investment castings Materials handling Nuclear reactor components Porosity Radioactive materials Servomechanisms Shrinkage 420 UNS S42000 Casting-related failures Background Testing Procedure and Results Discussion Conclusion and Recommendations Selected...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001602
EISBN: 978-1-62708-229-7
... Turbine Materials in Marine Environment , Bath, England , 1976 , pp. 1 – 11 . 7. Anon.: in Metals Handbook , 9th ed. , Vol. 13 , Corrosion , ASM International , 1987 , p. 1001 . 8. Anon.: in Inspection and Acceptance Requirements Investment Cast W501B/B6 Turbine Blades , TIS 1004...
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
..., shows the characteristic dendritic microstructure produced by the investment casting method, with a grain size on the order of 0.5 to 1.0 mm. On the suction side of the blade was a layer of small (50 µm) grains ( Fig. 6 ). Figure 7 shows the grain boundaries with carbide precipitates (M 23 C 6 or M 7...
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
...-molybdenum alloy investment castings in accordance with ASTM F-75. Table 1 gives the chemical composition requirements of ASTM F-75. Many prostheties are coated with a porous surface to provide locations for bond ingrowth and attachment. A high-strength bond between the porous coating and the implant...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046966
EISBN: 978-1-62708-229-7
...Abstract Abstract A turbine vane made of cast cobalt-base alloy AMS 5382 (Stellite 31; composition: Co-25.5Cr-10.5Ni-7.5W) was returned from service after an undetermined number of service hours because of crack indications on the airfoil sections. This alloy is cast by the precision investment...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001575
EISBN: 978-1-62708-217-4
... into an AA2024-T3 Al alloy spacer. [ref as nr. 200 & 270 in Figure 1 ] The casing is obtained by an investment casting in A357-T61 Al alloy [ref as nr. 34 in Figure 1 ] Visual Inspection by Stereoscope After disassembling of pump at single level, the components were inspected under...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001657
EISBN: 978-1-62708-227-3
... the microstructure. These are features typical of a MAR-M302 investment casting [ 28 ]. The microstructure also showed a coarse, peppery constituent abundant in the background, Figure 19 , which corresponds to the secondary carbide precipitated upon aging of the MAR-M302 vane. The secondary carbide is, however...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001758
EISBN: 978-1-62708-241-9
... be investment cast into an airfoil shape with intricate internal passages required for airfoil cooling. The earlier versions of the process resulted in castings having an equiaxed (EQ), randomly oriented grain structure with a large number of grain boundaries oriented perpendicular to the principal stress axis...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006831
EISBN: 978-1-62708-329-4
... of casting processes Casting process Characteristic Green sand Resin-bonded sand Plaster Lost foam Investment Permanent mold Die Part Material (casting) All All Zn to Cu Al to cast iron All Zn to cast iron Zn to Cu Porosity and voids (a) C–E D–E D–E C–E E B–C...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... and cast forms, as discussed in other articles in this Volume, can contain material discontinuities or inhomogeneities that may be undetected (and only revealed after heat treatment) and can cause cracking (or otherwise are revealed), possibly rendering the parts as scrap. Discontinuities can...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
...Abstract Abstract This article focuses on the general root causes of failure attributed to the casting process, casting material, and design with examples. The casting processes discussed include gravity die casting, pressure die casting, semisolid casting, squeeze casting, and centrifugal...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.9781627083294
EISBN: 978-1-62708-329-4
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003501
EISBN: 978-1-62708-180-1
... will be made from metal, plastic, ceramic, or composite. Level II: Determine whether metal parts will be produced by a deformation process (wrought) or a casting process; for plastics, determine whether they will be thermoplastic or thermosetting polymers. Level III: Narrow options to a broad...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006800
EISBN: 978-1-62708-329-4
..., age-hardening aluminum alloys, etc.), its general product form (e.g., wrought, cast, powder metallurgy, additive manufacture, etc.), and the processing method (e.g., forged, die cast, injection molded, etc.). All of these factors must be considered when the shape of a part is defined during...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003502
EISBN: 978-1-62708-180-1
... to aircraft, especially with their stressed lightweight alloy structures, but it is now becoming critical with less obvious items such as sectional cast iron boilers more than 30 years old. The inspection procedures mandated for such boilers did not envisage the need to check the wall thickness of the cast...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006815
EISBN: 978-1-62708-329-4
... and costs money, long before a return on investment can be realized. Common sense would dictate that sufficient time and money be invested in the design process to ensure that the optimal design is executed, minimizing downstream costs. In practice, time and money constraints often force the design team...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
.... Metalworking operations are also classified as either primary metalworking (where mill forms such as bar, plate, tube, sheet, and wire are worked from ingot or other cast forms) or secondary metalworking (where mill products are further formed into finished products by hot forging, cold forging, drawing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
... may increase in frequency over time. In many cases, avoiding failures beyond a certain predetermined desired life provides no benefit, such as is the case when a surgical implant is designed to far outlive the human recipient. There is also a point of diminishing return on investments related...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... life provides no benefit, such as when a surgical implant is designed to far outlive the human recipient. There is also a point of diminishing return on investments related to extending the life of a component. One example is when the increasing repair costs for a car exceed its worth. A life-cycle...