Abstract
Abstract Fatigue crack growth is considered to be a limiting factor for the life time of the first wall of a Tokamak type controlled thermonuclear reactor. As a result of the high energy neutron spectrum in the D-T fusion reaction not only defects but also large quantities of helium due to nuclear transmutation are produced in the structural materials. One way of simulating the damage of high energy neutrons is to use light ions by means of a charged particle accelerator. In the present work Type 316 stainless steel specimens were irradiated in a suitable irradiation chamber using a variable energy cyclotron. Fatigue crack growth under cyclic tensile stress was measured under simultaneous 18 MeV proton irradiation producing a displacement damage rate of the order of 10 −7 dpa s −1 . The same type of specimens were implanted with 38 MeV α-particles and tested after bombardement. It was found that light ions irradiation has only a slight influence on fatigue crack growth at 500°C in type 316 stainless steel.
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