EVALUATION OF FATIGUE STRENGTHS OF WC CERMET- AND 13Cr STEEL-SPRAYED MATERIALS

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概要

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• Rotating bending fatigue tests have been conducted at a room temperature in laboratory air using specimens of medium carbon steel(S45C), low alloy steel (SCM435) and titanium alloy (Ti-6Al-4V) with high velocity oxy-fuel(HVOF) sprayed coating of a cermet(WC-12%Co) and S45C with wire flame spraying(WFS) sprayed coating of a 13Cr steel(SUS420J2), and the fatigue strength and fracture mechanisms were studied. The fatigue strength evaluated by nominal stress was strongly influenced by substrate materials and the thickness of sprayed coatings.Detailed observation of crack initiation on the coating surface and fractuer surface revealed that in the WC cermet-sprayed materials, small defects initiated at WC grain boundaries coalesced and then the crack grew rapidly in the coating, while in the 13Cr steel-sprayed material, many microcracks were initiated from defects on the coating and coalesced to be a main crack. Cracks were initiated in the substrate due to the stress concentration of the crack in the coating, which was modeled by finite element analysis. The fatigue strength of the sprayed materials was dominated by that of the sprayed coating. Thus, the fatigue strength could be evaluated uniquely in terms of the true stress on the coating surface.

• 社団法人日本材料学会の論文
• 1998-03-15

著者

• Ogawa Takeshi

  Graduate School Of Life And Environmental Sciences Osaka Prefecture University

• Harada Yoshio

  TOCALO Co.

• Ogawa Takeshi

  Dept. of Internal Med., Inst. of Clin Med, univ. of Tsukuba

• Harada Yoshio

  Tocalo Co. Ltd.

• Tokaji Keiro

  Dept. of Mechanical and Systems Engineering, Gifu Univ.

• Tokaji K

  Dept.of Mech.eng. Gifu University

• Tokaji Keiro

  Dept. Of Mechanical And Systems Engineering Gifu Univ.

• Ejima Toshikatsu

  Dept.of Mech.Eng., Gifu University

• Kobayashi Yoshifumi

  Tocalo Co., Ltd.

• Kobayashi Yoshifumi

  Research Laboratory Tokico Ltd.

• Ejima Toshikatsu

  Dept.of Mech.eng. Gifu University

• OGAWA Takeshi

  Department of Pure and Applied Sciences, University of Tokyo

• OGAWA Takeshi

  Department of Pure and Applied Sciences University of Tokyo

• HARADA Yoshio

  TOCALO Co., Ltd.

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