The Application of Scanning Contact Potentiometry Method and Diffraction of Thermal Neutrons at Physico-Mechanical Tests of Materials
Abstract
The results of physical and mechanical tests on the tensile strength of austenitic steel 12X18H10T, in the stress range from 100 MPa to the maximum value of 700 MPa, at which the sample was destroyed, are presented. Structural changes were registered synchronously by two methods: the method of scanning contact potentiometry and the method of diffraction of thermal neutrons. At loads above 650 MPa, the α-martensite phase was found in the austenite matrix, as well as the appearance of diffraction peaks characteristic of a cubic martensitic BCC lattice was observed in neutron spectra. On the potentiograms, this process corresponds to the appearance of local regions in which high values of electric potential gradients were observed. This is the case of discovery of the fatigue nucleus cracks in the tensile testing of steel ЭИ847 by the method of scanning contact potentiometry.
References
[1] V.I. Surin, A.A. Abu Ghazal, E.V. Voloshin, E.Y. Telnov, D.O. Titovets, «Device’s for measuring contact surface stress»// Journal of Advanced Research in Technical Science, -North Charleston, USA: SRC MS, CreateSpace.– 2017.– Issue 6. pp. 48-54.
[2] G.D. Bokuchava, V.L. Aksenov, A.M. Balagurov, V.V. Zhuravlev, E.S. Kuzmin, A.P. Bulkin, V.A. Kudryashev, V.A. Trounov, ”Neutron Fourier diffractometer FSD for internal stress analysis: first results”, Applied Physics A: Materials Science & Processing, v.74 [Suppl1], 2002, pp s86-s88. http://dx.doi.org/10.1007/s003390201750
[3] A.M. Balagurov, G.D. Bokuchava, E.S. Kuzmin, A.V. Tamonov, V.V. Zhuk, ”Neutron RTOF diffractometer FSD for residual stress investigation”, Zeitschrift für Kristallographie, Supplement Issue No. 23, 2006, pp. 217-222.
http://dx.doi.org/10.1524/9783486992526-038
[4] G.D. Bokuchava, “Materials microstructure characterization using high resolution time-of-flight neutron diffraction”, Romanian Journal of Physics, 2016, Vol. 61, No. 5-6, pp. 903-925. http://www.nipne.ro/rjp/2016_61_5-6/0903_0925.pdf
[5] A.M. Balagurov, I.A. Bobrikov, G.D. Bokuchava, V.V. Zhuravlev, V.G. Simkin, “Correlation Fourier Diffractometry: 20 Years of Experience at the IBR-2 Reactor”, Physics of Particles and Nuclei, 2015, Vol. 46, Issue 3, pp. 249-276. http://doi.org/10.1134/S1063779615030041
[6] G.D. Bokuchava, I.V. Papushkin, A.V. Tamonov, A.A. Kruglov, “Residual stress measurements by neutron diffraction at the IBR-2 pulsed reactor”, Romanian Journal of Physics, 2016, Vol. 61, No. 3-4, pp. 491-505. http://www.nipne.ro/rjp/2016_61_3- 4/0491_0505.pdf
[7] М.А. Штремель.Прочность сплавов. Часть II. Деформация.– М.: МИСИС, 1997. – 527 с.
[8] V. I. Surin, A. A. Morozov, P. V. Potapov, A. E. Batukhtin. Deformation activity of the metal surface as a factor influencing the work function of electrons// Scientific session MEPhI-2010. Abstract reports. In 3 volumes. Volume 2. Nanophysics and nanotechnology. Fundamental problems of science. Moscow: MEPhI, 2010. – 344 p.
(p. 88).
[9] V. I. Surin, A.V. Osintsev, V. I. Polish, P. S. Jumaev. Modeling of surface stresses in tension steel samples using the method of scanning contact potentiometry// ”Information technologies in design and production”, Moscow: FGUP VIMI, 2017, № 2(166).pp.42-49.
[10] H.M. Rietveld, ”A profile refinement method for nuclear and magnetic structures”, Journal of Applied Crystallography, Vol. 2, 1969, pp. 65-71. http://dx.doi.org/10.1107/S0021889869006558