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Mechanism of lubrication-induced surface cracking in hot chamber die cast thin-walled AZ91D parts
Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.ORCID iD: 0000-0002-0101-0062
Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.
Singapore Inst. of Mfg. Technology, 71 Nanyang Drive, 638075, Singapore.
Integrated Magnesium Techologies, Singapore.
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2003 (English)In: Materials and Manufacturing Processes, ISSN 1042-6914, E-ISSN 1532-2475, Vol. 18, no 4, 637-641 p.Article in journal (Refereed) Published
Abstract [en]

Thin-walled hot chamber die cast parts are often used to make telephone casings and similar products having primarily requirements on weight and aesthetically satisfying surfaces. The post casting surface treatment often generates a glossy appearance. The glossy appearance makes it extremely sensitive to small-scale flaws, such as blisters, cold shuts, and cracks. Hot chamber die casting of thin-walled parts requires high filling speed and the use of lubrication because the parts have high aspect ratios. In the manufacturing of such high aspect ratio parts with a wall thickness of 0.6 mm, a new type of cold crack induced by the lubrication is observed. To some extent this defect is similar to a blister, but the characteristic bump is not formed and the actual crack is formed by thermal contraction along the high aspect ratio areas.

Place, publisher, year, edition, pages
2003. Vol. 18, no 4, 637-641 p.
Keyword [en]
Aspect ratio, Crack initiation, Lubrication, Shrinkage, Surface treatment, Thickness measurement, Thin walled structures, Glossy, Hot chamber die cast, Lubrication induced surface cracking, Thermal contraction, Die castings
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-16650DOI: 10.1081/AMP-120022502OAI: oai:DiVA.org:hj-16650DiVA: diva2:454605
Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2015-06-01Bibliographically approved

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Jarfors, A. E. W.
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