A Procedure for the Sensitisation of martensite Evolution
Authors: Prof. Bernd-Arno Behrens, Ms. Katrin Weilandt
Abstract
Timely identification of damage is crucial for the secure use of sheet metal components in lightweight constructions. This work offers a new non-destructive method which allows for considerably earlier damage identification than achieved by conventional inspection. The method is based on a new concept of part-inherent sensors. These sensors are small areas on a metastable austenitic steel sheet, which have been plastically deformed by means of metal forming. Due to the plastic deformation, these areas are sensitive to martensite evolution under
applied elastic strains, and this sensitivity facilitates the correlation between the martensite content of the sensor and the strains it has undergone.
A mathematical description for the martensite evolution was analysed, based on the material model of Springub. This investigation was performed to clarify the influence of chemical fluctuations caused by different batches on the martensite evolution of the metastabile austenitic steel X5CrNi18-10 (EN 1.4301). In addition, a mathematical relation between the minor/major strain and the martensite content was derived.
| Attachment | Size |
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| IPROMS_Weilandt_K_2008.wmv | 16.98 MB |
