Abstract
In order to investigate the properties of interior originating fractures, uniaxial tension fatigue tests were carried out in air and high vacuum environments using pieces made of high strength steel (SNCM439) with various finishing conditions. As a result, the following were obtained: (1) Compared with surfaces fractures in air, the fatigue life of surface fractures in high vacuum tended to be longer. (2) The interior originating fractures were not affected by surface finishing conditions and environment. (3) The shape of the stepwise S-N diagram depends on surface finishing conditions. (4) Surface cracks in high vacuum grew from defects whose ΔK_<ini> were lower than threshold of surface cracks growth in air.
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