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Development of a photothermal measuring technique for the determination of hardness profile in steel

Objective



The performance of surface hardened parts is a major issue in automotive and aerospace industries. There is, therefore, a strong need of hardening companies to improve the quality control of their products by introducing new measurement systems which allow for non-destructive, non-contacting hardness profile measurements as an alternative to the presently used destructive inspection methods. It is the aim of this project to develop a contact free, non-destructive photothermal measurement methodology. This will result in the design of a photothermal hardness measurement system which will be an important step to achieve a 100 % on-line production control. The network is proposed for Thematic Networks Type 2 as an Implementation Phase Network. The measurement method will be developed for surface hardened steel samples Radiometric photothermal measurement methods will be optimised for hardness testing and applicability in an industrial environment. Calibration curves relating hardness to thermal diffusivity changes will be elaborated and recommendations for the use of the radiometric photothermal method for a specific hardening treatment will be given. An important task is the further development of existing mathematical inversion schemes for calculating the thermal diffusivity profile from photothermal data. Using the calibration curves in combination with microstructural studies, this will result in a methodology for hardness profile measurements. The partnership consists of end-users of hardness quality control systems who also will supply samples from their production lines. Small and medium sized enterprises (SMEs) as well as a major European car manufacturer collaborate with research institutes specialised in photothermal measurements and materials science. It is expected that the innovative hardening measurement technique will improve the competitivity of the industrial partners by increasing the reliability of hardened products by an on-line quality control.

Coordinator

Institut für Laserrtechnologien in der Medizin und Meßtechnik ander Universität Ulm
Address
12,Helmholzstraße 12
89081 Ulm
Germany

Participants (10)

C. Stiefelmayer GmbH & Co. KG
Germany
Address
42,Rechbergstrasse 42
73770 Denkendorf
COMMISSION OF THE EUROPEAN COMMUNITIES
Italy
Address
Via Enrico Fermi 1
21020 Ispra
Centro Ricerche Fiat ScpA
Italy
Address
Strada Torino 50
10043 Orbassano Torino
FRIEDRICH-SCHILLER-UNIVERSITAET JENA
Germany
Address
1,Max-wien-platz 1
07743 Jena
Katholieke Universiteit Leuven
Belgium
Address
200 D,celestijnenlaan
3001 Heverlee
Office National d'Etudes et de Recherches Aérospatiales
France
Address
29,Avenue De La Division Leclerc 29
923220 Chétillon
UNIVERSITY OF HELSINKI
Finland
Address
Siltavuorenpenger 20 D
00014 Helsinki
UNIVERSITY OF ROME "LA SAPIENZA"
Italy
Address
Via A. Scarpa 14-16
00161 Roma
Université de Paris VI (Université Pierre et Marie Curie)
France
Address
Rue Vauquelin
75005 Paris
Valmet Power Transmission Inc.
Finland
Address

40101 Jyväskylä