MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Suppression of Macroscopic Defects through the Control of Friction between Workpiece and Dies in a Forged Magnesium Alloy Part with Ribs
Akira TakaraLi-Fu ChianSung Wook ChungHidetoshi SomekawaHiroyuki WatanabeYorinobu TakigawaKenji Higashi
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2008 Volume 49 Issue 5 Pages 898-902

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Abstract

Superplastic magnesium alloy sheets were closed-die forged into an experimental part with ribs, which are asymmetrical elements to the plane of the forging. A macroscopic surface defect, which was formed by extrusion-type flow, was observed opposite to the rib during forging under improper lubrication conditions. However, the formation of the defect could be successfully suppressed by changing the frictional conditions of the workpiece/dies interface. Analysis of the rib forging using a finite controlled volume method simulation suggested that the suppression of the extrusion-type defect is associated with a change in velocity field distribution of the deforming material.

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© 2008 The Japan Institute of Metals and Materials
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