Resistance-measurement studies of the peculiarities of the structural state of chromium-nickel-molybdenum austenitic reactor steels doped with titanium and phosphorus

Abstract

Understanding of the mechanisms of radiation-induced phenomena is of fundamental value both for design of new steels and for improvement of the properties of the existing ones. Along with the crystal structure and chemical composition of the matrix, doping admixtures and the material microstructure play important role in these phenomena. In this paper, the p eculiarities of the microstructural state of chromium-nickel-molybdenum austenitic steels doped with titanium and phosphorus are studied by means of resistance measurements. The existence of the synergetic effects of simultaneous doping of steels with titanium and pho sphorus has been confirmed. The effect of solid solution segregation as the annealing temper ature reaches 700-800 K, accompanied by increasing electric resistivity, and has been found. The energies of the migration of interstitial atoms and of the dissociation of the "interstitial site -titanium atom" pair have been determined. The phenomena observed are in agreement with the results obtained for other austenitic steels. Keywords: austenitic reactor steels, segregation, intermetallics, doping, electrical resistance.DOI: 10.17804/2410-9908.2017.6.091-102 References 1.Zeman A., Kaiser R., Inozemtsev V., Beatty R.L. IAEA activities on coordinated research of structural materials for advanced reactor systems. J. Nucl. Mater., 2012, vol. 428, pp. 3-5. DOI: 10.1016/j.jnucmat.2012.024 2.Voyevodin V.N., Neklyudov I.M. Problems of radiation stability of structural materials for nuclear power industry. Visnyk Kharkivskogo Universitetu, ser. fiz., 2006, vol. 746, no. 4, pp. 3-22. (In Russian Voronin V.I., Arbuzov V.L., Bobrovskii V.I., Danilov S.E., Kozlov K.A., Proskurnina N.V., Sagaradze V.V. Peculiarities of radiation-induced processes in the Cr-Ni-Mo austenitic steels studied by neutron diffraction. Diagnostics, Resource and Mechanics of materials and structures, 2015, iss. 5, pp. 80-89. Available at: URL: http://dream-journal.org/issues/2015-5/2015-5_46.html (accessed 20.11.2017. 5.Sagaradze V.V., Nalesnik V.M., Lapin S.S., Aliabev V.M. Precipitation hardening and radiation damageability of austenitic stainless steels. J. Nucl. Mater., 1993, vol. 202, pp.137-144. DOI: 10.101690036-X 6.Okita T., Wolfer W.G., Garner F.A., Sekimura N. Effects of titanium additions to austenitic ternary alloys on microstructural evolution and void swelling. Philosophical Magazine, 2005Magazine, , vol. 85, no. 18, pp. 2033Magazine, -2048. DOI: 10.1080/14786430412331331871 7.Maziasz P.J. Formation and stability of radiation-induced phases in neutron irradiated austenitic and ferritic steels.