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Use of residual hydrogen to produce CP-Ti powder compacts for low temperature rolling by Rimma Lapovok; Dacian Tomus; Matthew R. Barnett; Mark A. Gibson is a Engineering article available to read on EtoBox.

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Use of residual hydrogen to produce CP-Ti powder compacts for low temperature rolling The present work investigates the optimal level of residual hydrogen in partially de-hydrogenated powder to produce CP-Ti plate compacts using ECAP with back pressure which are subsequently rolled at low temperature. A comparative study of the compaction of two TiH 2 powders and a CP-Ti powder, with particle sizes 150 lm, 50 lm and 45 lm respectively, has been carried out. The hydride powders have also been compacted in a partially de-hydrogenated state. The optimal level of residual hydrogen with respect to the density of the resulting compact and the associated mechanical properties has been defined. ECAP at 300 8C produced compacts from these partially de-hydrogenated powders of 99.5 % theoretical density, while CP-Ti was compacted to almost full theoretical density under the same ECAP conditions. Therefore, the compaction of powder by ECAP does not benefit from temporary hydrogen alloying. These compacts then were rolled at temperatures ranging from room temperature to 500 8C with an 80 % reduction in a single pass. Heat treatment after the rolling can modify the microstructure to improve the

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Author

Rimma Lapovok; Dacian Tomus; Matthew R. Barnett; Mark A. Gibson

Publisher

Walter de Gruyter GmbH

Published

2009

Language

EN

Field

Engineering (Physical Sciences)