Experimental characterisation in sheet forming processes by using Vickers micro-hardness technique
| Autor: | Philippe Dal Santo, R. Bahloul, Alain Potiron, Ali Mkaddem |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Metallurgy Bent molecular geometry Metals and Alloys Forming processes Sheet material Indentation hardness Industrial and Manufacturing Engineering Computer Science Applications Modeling and Simulation visual_art Ceramics and Composites Hardening (metallurgy) visual_art.visual_art_medium Composite material Sheet metal |
| Zdroj: | Journal of Materials Processing Technology. 180:1-8 |
| ISSN: | 0924-0136 |
| DOI: | 10.1016/j.jmatprotec.2006.04.006 |
| Popis: | In this paper, an experimental micro-hardness procedure is proposed to evaluate the evolution of HSLA steel behaviour during each sequence of sheet forming process. As micro-hardness technique offers a reliable inspection, it was retained here to follow the mechanical characteristic changes, which may happen during manufacturing progress. This contribution consists in characterisation of sheet material at different steps: virgin sheet, unreeled sheet, straightened sheet and bent sheet. Measurement performed on virgin HSLA steel showed that material is highly heterogeneous within the sheet thickness. The micro-hardness profiles examined after the bobbing-off step showed a high sensitivity of sheet behaviour to straightening operation that is widely adopted in steel working in order to make sheet sufficiently flat for forming. A level of hardening ratio between virgin material and straightened material has been clearly observed. Moreover, micro-hardness is investigated on bent parts at the fold zone for displaying the mechanical properties modifications under a large gradient deformation. In this way, hardening phenomenon and damage phenomenon, which are generally activated simultaneously for elastoplastic steel, are quantified accurately. Results compared into them gave a good idea about the interaction of process–material during manufacturing. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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