The Effects of Metallurgical Factors on Fatigue Strength : Part 5, The Effects of Ni, Cr and Mo (1)

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概要

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• The effects of Ni, Cr and Mo on fatigue strengths of low alloy steels for machine structure were investigated. Eight kinds of steels containing above alloying elements were prepared according to a statistical design. The results of tensile and fatigue tests were analyzed by variance analysis and multiple regression analysis methods. The conclusions are as follows : (1) The relation between fatigue limit Owo and alloying elements can be formulated as follows, Owo=3.3(Ni-1.27)+11(Cr-0.88)+20(Mo-0.13)-6.7(Ni-1.27)(Cr-0.88)+51.4 (2) The relation between fatigue limit Owo and yield strength Os can be formulated with correction terms of alloying elements as follows, Owo=0.426Os+{1.5(Ni-1.27)-8.8(Mo-0.13)+2.9(Ni-1.27)(Cr-0.88)+16.1} (3) The fatigue notch factor β of steels tested is almost equal to the stress concentration factor α of specimens. However, β of Ni-alloed steels is slightly higher than that of other steels.

• 一般社団法人日本機械学会の論文

著者

• Nishioka Kunio

  Central Research Laboratories

• NISHIKAWA Tomio

  Central Research Laboratories, Sumitomo Metal Industries, Ltd.,

• Nishikawa Tomio

  Central Research Laboratories Sumitomometal Industries Ltd.

• Nishikawa Tomio

  Central Research Laboratories Sumitomo Metal Industories Ltd.

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