Abstract
The present work is a study of the effects of helium on the microstructure, mechanical properties and fracture behavior of three kinds of steels, that is, a 12Cr-15Mn (wt%) austenitic steel, a Type 316 austenitic steel and a 9Cr-2Mo ferritic steel. Helium injection was performed using a cyclotron. Helium content was up to 2000 appm He. In the case of the type 316 stainless steel, intergranualr fracture was sometimes observed after tensile testing at room temperature. This material, however, showed only transgranular-ductile fracture at 773 K. The helium implanted (500 appm He) 9Cr-2Mo showed transgranular fracture at room temperature and 773 K. The helium implanted (500 appm He) 12Cr-15Mn also indicated only transgranular fracture by a tensile test at 773 K. In the present work, intergranular fracture was not observed in any of the steels at an elevated temperature of 773 K. Accordingly, this suggests that a high concentration of helium does not necessarily cause the intergranular fracture at a high temperature.
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