2323 ショットピーニングしたセラミックスの残留応力分布と表面強度(S32-3 セラミックスおよびセラミックス系複合材料(3),S32 セラミックスおよびセラミックス系複合材料)

概要

論文の詳細を見る
The surface of silicon nitride ceramics was modified by fine particles bombarding (FPB) of high strength steel with 50μm in diameter and by ultrasonic shot peening (USP) of tungsten carbide shots with 1.1mm in diameter. Some damages were introduced by FPB and the roughness increased with the increase of shot pressure. The roughness of USP surface also increased with the peening time. The residual stress in the sub-surface region measured by the X-ray diffraction method was compression. For FPB surfaces, the distribution of the residual stress was determined by the constant-penetration-depth method. The compressive stress on the surface was a large compression of about -1.5GPa and diminished 5μm below the surface. The compressive stress increased with the shot pressure for FPB. For USP surfaces, the compressive stress was nearly constant with in the layer of 10μm and increased up to -1.5GPa with the peening time. The fracture toughness measured by the Vikers indentation method also increased with the compressive residual stress.
一般社団法人日本機械学会の論文
2005-09-18