Published date: May 06 2018

Journal Title: KnE Materials Science

Issue title: 15th International School-Conference "New Materials – Materials of Innovative Energy" (MIE)

Pages: 242–249

DOI: 10.18502/kms.v4i1.2148

Y A Perlovich

M G Isaenkovaisamarg@mail.ru

P L Dobrokhotov

A K Amanova

A A Nikitina

M V Leont’eva-Smirnova

Thermal ageing (650 and 700∘C during 1000, 7000 or 13300 h) and creep (700∘C, 50 MPa) tests of tubes made from ferritic-martensitic steels EK181 and ChS139 were carried out. With the aid of X-ray techniques the investigation of crystallographic texture and structure condition after tests was conducted. Thermal ageing provides substructure enhancement. With the increase of ageing time one can note the decrease of microhardness and X-ray peaks broadening, which indicates inner elastic microstress relaxation. It was revealed that changes of crystallographic texture in the rupture area of steel ChS139 tube after creep test is similar to those after uniaxial tensile test at room temeprature. This indicates the similarity of the mechanisms of
grain reorientation for creep and tension. Recrystallization occurs in steel EK181 during creep test at temperature 700∘C leading to formation of recrystallization texture. This results in faster failure of steel EK181 (2486 h before rupture) in comparison with steel ChS139 (3426 h).

[1] A.A. Nikitina, V.S. Ageev, M. V. Leont’eva-Smirnova, N.M. Mitrofanova, I.A. Naumenko, A. V. Tselishchev, V.M. Chernov, Advances in Structural Materials forFast-Reactor Cores, At. Energy. (2016).


[2] N. S. Nikolaeva, M. V. Leont’eva-Smirnova, E. M. Mozhanov, et al., “Optimization of the technology of heat-treatment of drawn tubes made of ferrite-martensite steels EK-181 and ChS-139,” Vopr. At. Nauki Tekhn. Ser. Materialoved. Nov. Mater., No. 2(75), 47–58 (2013).


[3] Isaenkova M., Perlovich Yu., Fesenko V. Modern methods of experimental construction of texture complete direct pole figures by using X-ray data - IOP Conf. Series: Materials Science and Engineering 130 (2016) 012055 doi:10.1088/1757- 899X/130/1/012055W.C.


[4] Oliver, G.M. Pharr, Measurement of hardness and elastic modulus by instrumented indentation: Advances in understanding and refinements to methodology, J. Mater. Res. 19 (2004) 3.


[5] N. A. Polekhina, I. Yu. Litovchenko, M. V. Leontyeva-Smirnova et al. “The Microstructural Stability of Low-activation 12%-Chromium Ferritic-Martensitic Steel EK-181 during Thermal Aging”. AIP Conf. Proc. 1623, 495-498 (2014)


[6] V. M. Chernov, M. V. Leont’eva-Smirnova, E. M. Mozhanov et. al. Thermal Stability of the Microstructure of 12% Chromium Ferritic–Martensitic Steels after Long-Term Aging at High Temperatures. TECHNICAL PHYSICS Vol. 61 No. 2 2016.


[7] Tao Gu, Mingjia Wang, Yuantao Xu et. al. Effect of Long-Term Thermal Aging on Microstructure and High-Temperature Strength of a 10% Cr Martensite Ferritic Steel. steel research int. 87 (2016) No. 5