HIP処理によるSMF3035焼結材の回転曲げ疲労における切欠感度

概要

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Recently, many high-performance sintered materials have been produced by hot isostatic pressing (HIP). In order to clarify the fatigue behavior of HIP-sintered SMF3035(HIP'ed SMF3035), rotating bending fatigue tests of plain and notched specimens were carried out and optical microscopic observations were made successively on the fatigue process by using the plastic replica method. The main results obtained are as follows. (1) In plain specimens, the crack initiates from an inclusion or a minute in-coherent structure. (2) The fatigue limit of plain specimens is determined by the limiting condition for propagation of a micro crack. (3) Crack initiation lives are smaller than 10% of the life for a fracture. (4) The value of the notch root radius at the branch point is nearly equal to 0.5 mm. This means that the present material is not as notch-sensitive as the steel having nearly the same carbon content.
社団法人日本機械学会の論文
1989-12-25