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Investment castings

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Published: 01 June 2019
Fig. 19 Etched microstructural features of the investment cast MAR-M302 vane. (a) Eutectic carbide pools and script-type carbides; (b) Coarse peppery secondary carbide in the background. More
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 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 that the cracks...
Image
Published: 01 December 1993
Fig. 5 Section parallel to the crack plane, showing the characteristic dendritic microstructure produced by investment casting More
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
... cavities. Investment castings Materials handling Nuclear reactor components Porosity Radioactive materials Servomechanisms Shrinkage 420 UNS S42000 Casting-related failures Background The yoke body pin of a master slave manipulator, a remote-controlled device used for handling...
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
... manufacturing company. Both the sintered coating and the substrate were manufactured from cobalt-chromium-molybdenum alloy. Pertinent Specifications Medical prostheses used to replace joints in the human body are frequently manufactured as cobalt-chromium-molybdenum alloy investment castings...
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
... corrosion conditions. The buckets are fabricated by conventional investment casting (equiaxial grains) and uncoated. One of the controlled elements that has a direct influence on the bucket behavior at high temperature is the grain size. 1 Typically, the maximum size of the grain, and sometimes...
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
... the distribution of carbides on grain boundaries and inside them, as well as of γ′ precipitates. Figure 5 , representing a section parallel to the crack plane, 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...
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 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 method...
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
.... To achieve such remarkable results, turbine blade engineers over the last 40 years have developed various gamma prime (γ′) strengthened, nickel-based superalloys that can be investment cast into an airfoil shape with intricate internal passages required for airfoil cooling. The earlier versions...
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
... to AMS4845 bushing 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 ] Pump Investigation Visual Inspection by Stereoscope After disassembling of pump at single level...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006868
EISBN: 978-1-62708-395-9
... the investment in capital tooling and finished part costing. Once a process is selected for a given part and the tooling is completed, changing to a different process becomes an expensive event. Care must be exercised in process selection to ensure long-term suitability for the functionality of the part...
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
... Abstract The information provided in this article is intended for those individuals who want to determine why a casting component failed to perform its intended purpose. It is also intended to provide insights for potential casting applications so that the likelihood of failure to perform...
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
... , with interdendritic dark islands (eutectic carbide) and a needle-like constituent (script-type primary MC carbides) uniformly distributed throughout the microstructure. These are features typical of a MAR-M302 investment casting [ 28 ]. The microstructure also showed a coarse, peppery constituent abundant...
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 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 casting. Cast...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006927
EISBN: 978-1-62708-395-9
.... However, tooling complexity can lead to production capacity issues and down time; hence, thinking about how to design the part to keep the tooling as simple as possible is always recommended. Initial capital investment for a new part or assembly project is most always driven by tooling costs, so careful...
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
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... is such that decarburization is not prevented during austenitizing. Castings : Decarburization is a normal product found on the surface of ferrous castings. Decarburization is a particular problem for investment castings with close finished tolerances, due to the metal/mold interface reaction. For this reason, most...
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
... whether the part 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...
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
... 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, extrusion...