Subsurface Crack Initiation and Propagation Mechanism under the Super-Long Fatigue Regime for High Speed Tool Steel (JIS SKH51) by Fracture Surface Topographic Analysis (JSME Medal for Outstanding Paper in 2004)

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概要

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• rights: 本文データは社団法人日本機械学会の許諾に基づきCiNiiから複製したものであるIn order to study the subsurface crack initiation and propagation mechanism of high strength steel under a very high cycle fatigue regime, computational simulation with fracture surface topographic analysis (FRASTA) was carried out for subsurface fatigue crack initiated specimens of high speed tool steel (JIS SKH51) obtained from the rotating bending fatigue test in air. A remarkable area formed around the nonmetallic inclusion inside the fish-eye region on the fracture surface, which is a feature on the fracture surface in super long fatigue. This so-called GBF (granular-bright-facet) was observed in detail by a scanning probe microscope and a three-dimensional SEM. The GBF area, in which a rich carbide distribution was detected by EPMA, revealed a very rough and granular morphology in comparison with the area inside the fish-eye. It was clearly simulated by FRASTA that multiple microcracks were initiated and dispersed by the decohesion of a spherical carbide from the matrix around a nonmetallic inclusion, and converged into the GBF area during the fatigue process. After the formation of the GBF area, interior cracks grew radially and a fish-eye pattern formed on the fracture surface.

• 一般社団法人日本機械学会の論文
• 2006-01-15

著者

• Shiozawa Kazuaki

  Department Of Mechanical And Intellectual Systems Engineering University Of Toyama

• Shiozawa Kazuaki

  Department Of Mechanical And Intellectual Systems Engineering Toyama University

• MORII Yuuichi

  Komatsu Ltd.

• NISHINO Seiichi

  Department of Mechanical and Intellectual Systems Engineering, University of Toyama

• Nishino Seiichi

  Department Of Mechanical And Intellectual Systems Engineering University Of Toyama

関連論文

• Crack Propagation behavior under Low-Cycle Corrosion Fatigue of A7003-T6 Aluminum Alloy
• Subsurface Crack Initiation and Propagation Mechanism under the Super-Long Fatigue Regime for High Speed Tool Steel (JIS SKH51) by Fracture Surface Topographic Analysis (JSME Medal for Outstanding Paper in 2004)
• Effect of Microstructure on Creep and Creep-Fatigue behavior in Ti-6Al-4V Alloy at Elevated Temperature
• Corrosion Resistance and Corrosion Fatigue Strength of Carbon Steel Coated with Chromium Nitride by Multistage PVD Method

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