Dislocation Density Effect on Thermal Diffusivity of AISI 316 Steel

Abstract:

AISI 316 steel samples have been investigated by infrared thermography (IRT) after introducing controlled degrees of plastic deformation by means of tensile tests. Microstructural examinations of the same samples showed that the progressive decrease of thermal diffusivity observed for successive steps of plastic deformation is due to the increase of dislocation density. Dislocations affect thermal diffusivity in two ways, by acting as centres of scattering and by inducing elastic stress fields. To evaluate the two contributions, IRT measurements have been also carried out in-situ, during tensile tests at progressively increasing strain. For relevant plastic deformation, the dislocations mainly affect the thermal diffusivity by scattering mechanism. On the basis of these results, it can be concluded that thermal diffusivity is significantly affected by the increase of dislocations density therefore locally resolved IRT measurements seem promising to detect states of local plasticization in mechanical components.

• Periodical: Key Engineering Materials (Volume 605)
• Pages: 27-30
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.605.27
• Online since: April 2014
• Authors: Girolamo Costanza, Roberto Montanari, Stefano Paoloni, Maria Elisa Tata
• Keywords: AISI 316 Steel, Dislocation Density, Infrared Thermography, Microstructure, Plastic Deformation, Thermal Diffusivity

References

[1] A. Ciliberto, G. Cavaccini, O. Salvetti, M. Chimenti, L. Azzarelli, P.G. Bison, S. Marinetti, A. Freda E. Grinzato, Infrared Physics & Tech. 43 (2002), p.139.

DOI: 10.1016/s1350-4495(02)00132-9

[2] A.C. Bento, F.C. Gandra, E. da Silva, H. Vargas, L.C. Mirando, Phys Rev. B 45 (1992) p.5031.

[3] L. Nicolaides, A. Mandelis, C.J. Beingessner, J. Appl. Phys. 89 (2001), p.7879.

[4] S. Marinetti, V. Vavilov, Corrosion Science, 52 (2010), p.865.

[5] G. La Rosa, A. Risitano, Sensor Letters, 577-578 (2014), p.69.

[6] F.A. Dıaz, J.R. Yates, E.A. Patterson, Int. J. Fatigue. 26 (2003), p.365.

[7] H. Pron, J. Henry, B. Flan, J. Lu, S. Offermann, J. Beaudoin,. Int. J. Th. Sci. 41 (2002), p.369.

[8] S. Quinn, J.M. Dulieu-Barton, J.M. Langlands, Strain 40 (2004), p.127.

[9] S. Paoloni, M.E. Tata, F. Scudieri, F. Mercuri, M. Marinelli, U. Zammit,. App. Phys. A, 98 (2010), p.461.

[10] F.R.N. Nabarro Theory of crystal dislocations. Dover Publications (1987).

[11] A. Yara, Y. Yakoyama, T. Nakanishi, Proceedings of Ultrasonics Symposium (1994), p.683.

[12] X. Maldague. Theory and practice of infrared technology for nondestructive testing, Wiley-Interscience Publication (2001).

[13] G.K. Williamson, R.E. Smallman., Phil. Mag. 1 (1956), p.34.

[14] D.P. Almond, P.M. Patel, Photothermal Sciences and Techniques. Chapman & Hall (1996).

[15] H. Pron, C. Bissieux, Int. J. of Thermal Sciences, 43 (2004), p.1161.