機械仕上された鋼材の加工変質層の研究 : 第1報, 高マンガンクロム鋼の加工変質層とそれが引張試験結果に及ぼす影響

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タイトル別名
  • Studies on the Surface Layer of Machined Steel : 1st Report, Machined Surface Layer of High Manganese-Chromium Steel and its Influences on Results of Tensile Test
  • キカイ シアゲ サレタ コウザイ ノ カコウ ヘンシツソウ ノ ケンキュウ 1

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抄録

The depth and the degree of work hardening of the surface layers of tensile specimen of high Mu-Cr steel finished under several conditions (turning, grinding, polishing and electro-polishing) were studied experimentally as a function of depth of cut. Then, the behavior of these surface layers under the tensile load test was observed through a microscope. The conclusion of these studies are as follows : (i) The depth of surface layer and the degree of work hardening (we defined tentatively Hw as the representation of this degree) are relative to the depth of cut at finishing condition. (ii) The work hardening to these surface layers affects the local contraction of specimen and under some finishing condition invites the surface cracking. (iii) The notch effect caused by cracking and the stress concentration in the surface layer are the reason for the influences ascribed above.

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