Fatigue strength and fracture mode of superrapid induction hardened steel with shallow hardened layer

Jun Komotori, Fumi Inoue, Michiaki Kanda, Masao Shimizu, Yoshitaka Misaka, Kazuhiro Kawasaki

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Four kinds of surface hardened specimens having hardened thicknesses of 0.7 approx. 1.8 mm were prepared using a 'Micropulse induction heating system'. Rotation bending fatigue tests were performed with special focus on the effect of hardened thickness on fatigue properties. Measurement of residual stress and observation of the fracture surface were also carried out to investigate the fracture mechanism of the specimen with a shallow hardened layer. It was found that there is not much improvement of fatigue strength at 107 cycles for specimens with shallow hardened layers in spite of having a high compressive residual stress of about 1 000 MPa. This is because the fatigue cracks originating from inside the hardened layer leads to final fracture of the specimen (internal fracture mode). Improvement of fatigue strength has been achieved by forming thick hardened layers. In this case, fatigue cracks originate from inclusions located in hardened layers, which leads to the final fracture (hardened layer fracture mode).

本文言語English
ページ(範囲)240-245
ページ数6
ジャーナルNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
63
606
DOI
出版ステータスPublished - 1997
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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