ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
Regular Article
Microstructures and Properties of High-strength Alloys Severely Deformed by Machining
Manabu TanakaRyuichi KatoJun-ya KobayashiRika Yoda
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2008 Volume 48 Issue 6 Pages 815-823

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Abstract

Microstructures and properties were examined on the chip specimens severely deformed to a given shear strain (γ) by machining in the high-strength Ni-base Inconel X-750 alloy and 6061-T6 aluminum alloy. Chip specimens has a deformation structure principally composed of elongated grains (for example, a few μm to about 100 μm in length and about 1 μm to a few tens μm in width for the chip specimen of γ<3 of the Inconel X-750 alloy). Many subgrains separated by small or medium angle grain boundaries (misorientation, θ<15°) were also observed within relatively large grains. In the case where detailed analysis by FESEM/EBSP was possible, the fraction of large angle grain boundaries (θ≥15°) and that of medium angle grain boundaries (5°≤θ<15°) were relatively small, and most of grain boundaries were small grain boundaries (1°≤θ<5°) in the chip specimens of both alloys. Internal friction of the chip specimen was much larger than that of the original material. Large internal friction of the chip specimens was principally attributed to many cracks formed during machining. The hardness of chip specimens largely increased with increasing shear strain imposed by machining in the Inconel X-750 alloy, although the increase of hardness with shear strain was not so large in the 6061-T6 alloy.

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© 2008 by The Iron and Steel Institute of Japan
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