The Effects of Metallurgical Factors on Fatigue Strength : Part 4, The Effects of N and B

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概要

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• The effects of nitrogen and boron in quenched and tempered carbon steels on fatigue strengths were investigated. Four kinds of steels containing above elements were prepared. The results of tensile and fatigue tests were analyzed with H term of the following equation. Ow(α, T)=K(α, T)Os(T)+H(e, α, T) α : stress concentration factor T : heat treatment condition e : alloying element The conclusions are as follows. (1) In the case of quenching and 650℃ tempering, the effects of N and B on H term are not noticeable, but there may exist the interaction effect of N and B on static strength. (2) In the case of quenching and 550℃ tempering, there may exist some effects of N on fatique strength of plain specimens. (3) K value in above equation can be defined as follows. K=0.426 for plain specimens and K=0.116 for notched specimens with α=3 in heat treatment of normalizing, quenching and 450℃〜650℃ tempering.

• 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 Sumitomo Metal Industories Ltd.

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