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shrinkage porosity

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c0089530
EISBN: 978-1-62708-219-8
... steel conforming to ASTM A 148, grade 150-125. The crack was found to have originated along the lower surface initially penetrating a region of shrinkage porosity. It was observed that cracking then propagated in tension through sound metal and terminated in a shear lip at the top of the eye...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0089534
EISBN: 978-1-62708-223-5
... by metallographic examination to be case carburized. The case was found to be martensite with small spheroidal carbides while the core consisted of martensite plus some ferrite. The fracture was revealed to be related to shrinkage porosity. Tempering was revealed to be probably limited to about 150 deg C...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0047263
EISBN: 978-1-62708-218-1
... through the defect indicated shrinkage porosity. This defect was found to interconnect the water jacket and the exhaust gas flow chamber. No cracks were found by magnetic-particle inspection. The gray iron cylinder head had a hardness of 229 HRB on the surface of the bottom deck. The microstructure...
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Published: 01 June 2019
Fig. 7 SEM photograph of the peeled off nugget surface showing shrinkage porosity, insufficient melting and penetration, and gas evolution (which could be due to presence of moisture, oil, etc. at the interface) at the interface More
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Published: 01 June 2019
Fig. 9 Microstructure of the weld showing (a) shrinkage porosity in the nugget, (b) intergranular cracks emanating from the fusion zone, W1 More
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Published: 01 June 2019
Fig. 1 Section from a failed cylinder-head exhaust port. The shrinkage porosity allowed engine coolant to leak into the exhaust port. Not polished, not etched. 0.9× More
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Published: 01 June 2019
Fig. 2 Scanning electron micrograph of shrinkage porosity in a steel weld More
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Published: 01 June 2019
Fig. 3 Detail of shrinkage porosity in steel weldment. Note that the secondary dendrite arms are spaced at 90° in this cubic crystal structure material, unlike snowflakes formed from water, which prefer a hexagonal crystal habit. More
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Published: 01 June 2019
Fig. 1 Wire-stretching jaws that broke because of shrinkage porosity and low ductility of case and core. The jaws, sand cast from low-alloy steel, were used to stretch wire for prestressed concrete beams. (a) Two pairs of movable jaws. 0.7×. (b) Two pairs of stationary jaws. 0.7×. (c) and (d More
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Published: 01 December 1993
Fig. 13 SEM micrograph showing shrinkage porosity detected at the suspected fracture origin on tooth F-18. ∼15× More
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Published: 01 December 1993
Fig. 18 Shrinkage porosity observed at the suspected fracture initiation site on tooth F-18. Unetched. 50× More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001014
EISBN: 978-1-62708-223-5
... with a steel which is cast, carburized, quenched, and tempered. The structure was generally satisfactory, except for the presence of severe shrinkage porosity. It was concluded that the presence of shrinkage porosity in critical areas was the primary cause of fracture. Extremely high hardness indicating a lack...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c0089696
EISBN: 978-1-62708-220-4
... of cracks at slag inclusions and sharp fillets in weld-repair areas in the casting. The weld-repair procedures were unsatisfactory. The cracks propagated in a fatigue mode. he casting quality was judged unacceptable because of the presence of excessive shrinkage porosity. It was recommended that crosshead...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0089526
EISBN: 978-1-62708-218-1
... from the water jacket next to the plug and the area next to the No. 3 intake port. A wave of microporosity travels midway between the inner and outer surfaces of the casting was observed and was concluded to have caused the cracking. The reasons and remedies for shrinkage porosity were discussed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001089
EISBN: 978-1-62708-214-3
... of the presence of excessive shrinkage porosity. It was recommended that crosshead castings be properly inspected before machining. Revision of foundry practice to reduce or eliminate porosity was also recommended. Selected References Selected References • Failures Related to Casting , Failure Analysis...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c9001641
EISBN: 978-1-62708-235-8
... minimized. Die castings Electroplating Porosity Shrinkage Surface defects Zinc Casting-related failures Near-surface porosity in zinc die castings that were subsequently plated with copper, nickel, and bright chromium was causing blemishes in the plating. The platers had already performed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001612
EISBN: 978-1-62708-218-1
... joined. This observation was supported by the presence of shrinkage porosity, insufficient melting and/or penetration, and gas evolution (which could be due to presence of moisture, oil, etc.) at the weld interface ( Fig. 7 ). The interface between the middle sheet and the bottom sheet revealed large gap...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090971
EISBN: 978-1-62708-222-8
.... An exemplar casting from a lot known to be acceptable was provided for comparison purposes. Investigation The macroscopic fracture features, even in lab fracture regions, appeared brittle. Substantial shrinkage porosity was also apparent within the casting wall on the fracture surface. Examination...
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Published: 01 June 2019
Fig. 17 Coating degeneration and corrosion attack in MAR-M302 vane along the concave airfoil side. (a) Fine cracking; (b) Subsurface shrinkage porosity; (c) Corrosion product penetration in the subsurface porosity. More
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Published: 01 June 2019
) Microstructure of the failed casting showing massive, cracked inclusions and shrinkage. Unetched. 30×. (c) Microstructure of an exemplar zinc casting showing fewer, finer inclusions, and less shrinkage porosity. Unetched. 30× More