Effect of radiogenic 3 He and hydrogen on the mechanical properties and structure of 12Kh18N10T steel

We present some results of studying the influence of high-pressure hydrogen (80 MPa), radiogenic 3 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 describe the procedure of tests of specimens containing 3 He. It has been established that the joint action of hydrogen and 3 He affects slightly the ultimate strength of the specimens. Saturation of steel with radiogenic 3 He by the method of “tritium trick” increases its yield strength. Hardening of the steel caused by helium increases with temperature and 3 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.