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Detection of martensite phase and texture in cold worked 304 stainless steel by micro-magnetic and x-ray diffraction technique

 
: Sagar, S.; Ravi Kumar, B.; Kopp, M.; Altpeter, I.; Dobmann, G.; Bhattacharya, D.

European Federation for Non-Destructive Testing -EFNDT-; Spanish Society for Non-Destructive Testing:
8th European Conference on Nondestructive Testing 2002. CD-ROM
Madrid, 2002
European Conference on Nondestructive Testing (ECNDT) <8, 2002, Barcelona>
Englisch
Konferenzbeitrag
Fraunhofer IZFP ()
Martensite; nondestructive testing; micromagnetic; multiparameter; cold worked

Abstract
AISI 304 is the most widely used alloy in the industry of the austenitic group. It is non magnetic, has excellent corrosion resistance, unusually good formability and also the formation of a´-martensite with cold working increases the strength of the 304 alloys. The a´- martensite phase is magnetic and a small amount of ferrite is also necessary to stop cracking during solidification of welds[1]. The detection of small amount of martensite in austenitic matrix is important from the industrial point of view. Though the earlier studies have shown the applicability of magnetic techniques for the detection of martensite in austenitic matrix[2-3] still the quantitative detection of small volume percentage of martensite by non-destructive technique is in due. In this paper an attempt has been made to use the 3MA method ( Micromagnetic, Multiparameter, Microstructure and Stress Analysis )[4] for the detection of martensite phase in two different sets of cold worked 304 stainless steel. X ray diffraction method is used to compare the results as obtained by 3MA device. The good correlation between the measured values of martensite in different sets of cold-rolled specimens by XRD and by using the 3MA technique reveals that the 3MA technique can be used to detect quantitatively the small volume percentage of martensite phase in cold worked 304 stainless steel.

: http://publica.fraunhofer.de/dokumente/N-10057.html