冷間圧延したFe-Cr-Ni系ステンレス鋼の疲れ強さに対する組織と化学組成の影響

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タイトル別名
  • Influence of Structure and Chemical Composition on Fatigue Strength of Cold Rolled Fe-Cr-Ni Stainless Steel
  • レイカン アツエン シタ Fe-Cr-Niケイ ステンレス コウ ノ ツカレ ツヨサ ニ タイスル ソシキ ト カガク ソセイ ノ エイキョウ

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説明

In order to investigate the influence of the amount of martensite and the chemical composition on the fatigue strength of cold rolled Fe-Cr-Ni stainless steels, saturation flux densities were measured to estimate the amount of martensite and bending fatigue tests were carried out. In these measurements 75% cold rolled stainless steel sheets with 4∼12%Ni and 17∼21%Cr (16.5∼29%Ni equivalent) were used as the specimens. The results obtained are summarized as follows:<BR>(1) In the fatigue strength, the strain-induced martensite structure is highest, the athermal martensite structure is not so high as the former, and the least high fatigue strength belongs to the austenite structure.<BR>(2) The fatigue strength of the martensite structure is remarkably lowered by a mixed austenite structure; especially athermal martensite is sensitive to the presence of the other phases. It seems that the marked variation in fatigue strength of Fe-Cr-Ni stainless steel is due largely to the coexistence of these three structures, namely, strain-induced martensite, athermal martensite and austenite.<BR>(3) The fatigue strength of 75% cold-rolled stainless steel varies according to the chemical composition. Over 23%Ni equivalent the fatigue strength is comparatively low owing to the large amount of austenite. In the range of Ni equivalent from 18% to 23%, especially at about 20%, the upper limit of the fatigue strength is high because of the large amount of strain-induced martensite, but the fatigue strength is subject to the influence of retained austenite and its variation is remarkable, under 17%Ni equivalent the fatigue strength takes an intermediate value between strain-induced martensite and austenite as the structure is approximately 100% athermal martensite.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 34 (9), 892-896, 1970

    公益社団法人 日本金属学会

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