Effect of radiogenic 3 He and hydrogen on the mechanical properties and structure of 12Kh18N10T steel
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EFFECT OF RADIOGENIC 3He AND HYDROGEN ON THE MECHANICAL PROPERTIES AND STRUCTURE OF 12Kh18N10T STEEL I. E. Boitsov,1 S. K. Grishechkin,1 M. J. Glugla,2 S. L. Kanashenko,3 R. A. Causey,4 A. M. Hassanein,5 and A. A. Yukhimchuk 1
UDC 669.788 + 620.172
We present some results of studying the influence of high-pressure hydrogen (80 MPa), radio3
genic He (with concentrations up to 130 appm), and their joint action on the mechanical properties and structure of 12Kh18N10T steel in the temperature range from 293 to 873 K. We de3
scribe the procedure of tests of specimens containing He. It has been established that the joint 3
action of hydrogen and He affects slightly the ultimate strength of the specimens. Saturation of 3
steel with radiogenic He by the method of “tritium trick” increases its yield strength. Harden3
ing of the steel caused by helium increases with temperature and He concentration and, at 873 K, is accompanied by substantial embrittlement. We also present results of the fractographic analysis of specimens tested under different conditions. 3
The radioactive decay of tritium dissolved in a metal leads to the accumulation of radiogenic He in it, which promotes the degradation of the properties of metals and decreases the service life of structures. In the present work, we describe some results of studying the joint action of hydrogen and 3He on the mechanical properties of 12Kh18N10T stainless steel, obtained in the course of carrying out Project No. 2276 of the International Scientific and Technical Center. We manufactured steel specimens containing 3He with the use of the method of “tritium trick” [1] by saturation with tritium under a pressure of ≈ 50 MPa at a temperature of ≈ 770 K for ≈ 45 h with their subsequent holding in air at room temperature, owing to which 3He was accumulated as a result of the radioactive decay of dissolved tritium. Prior to experiments, the specimens were detritiated successively by the methods of high-vacuum thermal desorption and isotopic replacement. We determined the amount of residual tritium and accumulated 3He with the use of a modernized OH900 gas analyzer of the firm “ELTRA” [2]. Procedure of the Strength Tests For studying the influence of 3He and hydrogen and their joint action on the mechanical properties of 12Kh18N10T steel at temperatures of 293, 573, and 873 K, we used standard cylindrical specimens (type IV, 1 Federal Nuclear Center–All-Russian Scientific and Research Institute of Experimental Physics, Sarov, Russia. 2 Tritium Laboratory, Karlsruhe, Germany. 3 Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia. 4 Sandia National Laboratories, Livermore, California, USA. 5 Argonne National Laboratory, Argonne, Illinois, USA.
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 43, No. 5, pp. 47 – 52, September – November, 2007. Original article submitted September 5, 2007. 646
1068–820X/07/4305–0646
© 2007
Springer Science+Business Media, Inc.
E FFECT OF RADIOGENIC 3 HE AND HYDROGEN ON MEC
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