Abstract
Failure cause of the 45CrNiMoV steel drill sleeve was investigated by optical microscope and scanning electron microscope, and the comparative analysis was carried out on the fatigue fracture morphology, inclusions, microstructure and hardness. The results show that the fatigue source is subjected to predominantly normal stresses, causing crack propagation in the perpendicular direction. The fatigue cracking propagation region is subjected to major shear stresses, causing crack propagation in a 45° plane. Eventually due to the material loaded area is reduced, the drill sleeve cracks quickly. The fatigue source is initiated at the thinner sleeve. The proportion of fatigue propagation stage is smaller in the total fatigue life, thus high fatigue life of the drill sleeve can be obtained by increasing fatigue crack growth threshold and decreasing fatigue crack initiation.
| Original language | English |
|---|---|
| Pages (from-to) | 151-156 |
| Number of pages | 6 |
| Journal | Jinshu Rechuli/Heat Treatment of Metals |
| Volume | 39 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2014 Aug 1 |
| Externally published | Yes |
Keywords
- 45CrNiMoV steel
- Drill sleeve
- Fatigue crack initiation
- Fatigue fracture
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering
- Metals and Alloys