ショットピーニングにおける残留オーステナイト,加工誘起マルテンサイトおよび予応力が圧縮残留応力に及ぼす影響

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To introduce a large and deep compressive residual stress with the Shot Peening method, the authors conducted an experiment using Vacuum Carburized and Shot Peened or Stress Shot Peened specimens, and investigated the influence of Arc height (Ah), Shot radius (R), retained Austenite (γ_R) content, Strain Induced Martensite (M_Q) content and loaded stress (σ_<pre>) upon compressive residual stress (σ_r) systemically. The major results obtained are: (a) The surface residual stress (σ_<rs>) and the maximum compressive residual stress (σ_<r max>) were almost dependent of Ah/R. (b) There is a little influence of γ_R content after Shot Peening upon σ_<rs> and σ<r max>. (c) There was hardly any influence of M_Q content uponσ_<rs> and σ<r max>. (d) Approx.50% of σ_<pre> was introduced as σ_<rs> and σ<r max>. (e) Further, it was found the a linear relation exists between Ah/R, γ_R & σ_<pre> and σ_<rs> (σ<r max>).
一般社団法人日本機械学会の論文
2003-04-25