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Title: Al-Cr系複合鋳込み遠心鋳造材のレーザ表面改質処理
Other Titles: Laser Surface Modification of Al-Cr Alloy Castings Produced by Centrifugal Duplex Casting
Authors: 大参, 達也1 Browse this author →KAKEN DB
高橋, 和久2 Browse this author
工藤, 昌行3 Browse this author
Authors(alt): Ohmi, Tatsuya1
Takahashi, Kazuhisa2
Kudoh, Masayuki3
Keywords: laser surface modification
rapid solidification
centrifugal casting
composite material
intermetallic compound
aluminum alloy
structure control
Issue Date: 1-Nov-2001
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals
Volume: 65
Issue: 11
Start Page: 1038
End Page: 1044
Publisher DOI: 10.2320/jinstmet1952.65.11_1038
Abstract: Effects of surface modification by a laser remelting process on the structure and hardness of surface composite castings of hyperperitectic Al-Cr alloys have been investigated. These castings were produced by either Centrifugal Duplex Casting(CDC process) or conventional centrifugal casting. The CDC process is applicable to the production of a tubular casting with an in-situ composite layer containing fine intermetallic crystals. On the other hand, there are coarse intermetallic crystals in the composite layer of the tubular castings produced by the conventional centrifugal casting. The intermetallic crystals in the laser-melted zone in each specimen were extremely refined regardless of their original size. However, many cracks were observed in the coarse intermetallic crystals near the melted zone on the specimen produced by the conventional centrifugal casting. On the contrary, no such defect were seen in the CDC specimens with finely dispersed intermetallic crystals. In these specimens, the hardness of the melted zone was about 50% higher than the substrate. Furthermore, addition of Cu was effective for the hardening of both of the substrate and the melted zone.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大参 達也

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