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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0089617
EISBN: 978-1-62708-232-7
... Abstract A forged 4130 steel cylindrical permanent mold, used for centrifugal casting of gray- and ductile-iron pipe, was examined after pulling of the pipe became increasingly difficult. In operation, the mold rotated at a predetermined speed in a centrifugal casting machine while the molten...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001378
EISBN: 978-1-62708-215-0
... Abstract Two 38 mm (1.5 in.) diam threaded stud bolts that were part of a steel mold die assembly from a plastics molding operation were examined to determine their serviceability. Chemical analysis showed the material to be a plain carbon steel that approximated 1045. Visual examination...
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Published: 01 June 2019
Fig. 1 Permanent mold of 4130 steel for centrifugal casting of gray- and ductile-iron pipe that failed because of localized overheating. The failure was caused by splashing of molten metal at the spigot end. Subsequent overheating resulted in mold-wall spalling and scoring, details of which More
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Published: 01 June 2019
Fig. 1 The DSC thermogram representing a molding resin pellet that had produced brittle parts. The thermogram shows a major melting transition associated with nylon 6/12 and a weaker transition attributed to polypropylene. More
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Published: 01 June 2019
Fig. 2 The DSC thermogram representing a second molding resin pellet that had produced brittle parts. The thermogram shows a major melting transition associated with nylon 6/12 and a weaker transition attributed to nylon 6/6. More
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Published: 01 December 2019
Fig. 6 Water-cooled Cu Mold More
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Published: 01 January 2002
Fig. 12 Internal discontinuities in a tire-mold casting. (a) Stringer-type inclusions adjacent to the surface. As-polished. (b) Structure below the surface. Note the change in graphite shape. Unetched. (c) Ferrite matrix with degenerate vermicular graphite nodules. Etched with 2% nital. All More
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Published: 01 January 2002
Fig. 30 Permanent mold of 4130 steel for centrifugal casting of gray- and ductile-iron pipe that failed because of localized overheating. The failure was caused by splashing of molten metal at the spigot end. Subsequent overheating resulted in mold-wall spalling and scoring, details of which More
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Published: 01 January 2002
Fig. 20 The DSC thermogram representing a molding resin pellet that had produced brittle parts. The thermogram shows a major melting transition associated with nylon 6/12 and a weaker transition attributed to polypropylene. More
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Published: 01 January 2002
Fig. 21 The DSC thermogram representing a second molding resin pellet that had produced brittle parts. The thermogram shows a major melting transition associated with nylon 6/12 and a weaker transition attributed to nylon 6/6. More
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Published: 01 January 2002
Fig. 28 (a) AISI 420 stainless steel mold containing a defect (arrow) observed after polishing the inside diameter surface. (b) Microscopic examination revealed a large silicate inclusion (unetched). More
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Published: 01 January 2002
Fig. 38 (a) Pitting on this mold cavity (arrow) was observed after polishing of the AISI S7 plastic mold and was caused by the use of improper post-EDM procedures. (b) The classic appearance of such failures. There is a large, remelted surface layer above a reaustenitized, untempered zone More
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Published: 01 January 2002
Fig. 20 Dimples in the ductile fracture surface of a permanent mold cast A356 Al-alloy More
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Published: 01 January 2002
Fig. 23 Correlation between striation spacing and fatigue life of permanent mold cast modified A356 aluminum alloy specimens tested at 0.5% strain amplitude More
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Published: 30 August 2021
Fig. 10 Permanent mold of 4130 steel for centrifugal casting of gray and ductile iron pipe that failed because of localized overheating. The failure was caused by splashing of molten metal at the spigot end. Subsequent overheating resulted in mold-wall spalling and scoring, details of which More
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Published: 01 December 1992
Fig. 7 Dendritric structures. (a) Steel F with 0.03% Mo. Mold thickness: 30 mm (1.2 in.). (b) Steel E, with 0.03% Mo. Mold thickness: 200 mm (8 in.). Dendritic structures. (c) Steel H, with 0.26% Mo. Moid thickness: 30 mm (1.2 in.). (d) Steel G, with 0.26% Mo. Mold thickness: 200 mm (8 in.). More
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Published: 01 December 1992
Fig. 9 Influence of molybdenum content and mold thickness on sulfur and molybdenum segregation on the fracture surface as measured by SIMS. More
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Published: 30 August 2021
Fig. 9 Plastic-mold die made from AISI S7 tool steel that was found to be cracked before use. A crack followed the lower recessed contour of the large gear teeth and had an average depth of 1.6 mm ( 1 16 in.). Smaller cracks were also observed on the flat surfaces. (a) Actual size More
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Published: 30 August 2021
Fig. 19 AISI P20 mold made from prehardened stock that was carburized and rehardened. After heat treatment, it was found to be cracked (arrow). See also Fig. 20 . More
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Published: 30 August 2021
Fig. 20 Metallographic section from the AISI P20 mold shown in Fig. 19 . (a) Top part of a macroetched (10% aqueous nitric acid) disk cut from the mold revealing a heavily carburized case. Actual size. (b) Micrograph showing gross carbide buildup at the surface with an underlying region More