Abstract
The aim of the present study is to make clear the factors controlling the fatigue strength of the locally hardened machine parts. Rotational bending fatigue tests were performed with special focus on the effect of a peak tensile residual stress generated at the quenching boundary on the fatigue properties of the super rapid induction hardened steel. Results are summarized as follows. (1) The final failure starts at the position of the specimen surface where the peak tensile residual stress has been generated near the quenching boundary. (2) The fatigue strength at 107 cycles of the locallyhardened specimen is inferior to that of the non-hardened one because of such a peak tensile residual stress. (3) The effect of the peak tensile residual stress on the fatigue strength becomes smaller at higher stress amplitude because the relaxation of the residual stress occurs under stress cycling at such high stress levels. (4) Reduction of the fatigue strength due to localized hardening can be removed by introducing the cold working of the specimen surface after quenching.
| Original language | English |
|---|---|
| Pages (from-to) | 308 |
| Number of pages | 1 |
| Journal | Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A |
| Volume | 67 |
| Issue number | 654 |
| DOIs | |
| Publication status | Published - 2001 |
Keywords
- High cycle fatigue
- Quenching boundary
- Super rapid induction heating and quenching
- Tensile residual stress
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering