Abstract
The effect of martensitic packet size on the machinability of prehardened mold steel at a hardness of ~40 HRC (typical hardness for prehardened mold steels) was studied in terms of cutting force and tool life. The machinability tests were performed in end milling using coated, cemented carbide tools at three different cutting speeds. The results showed that an increase in the martensite packet size led to higher cutting force and shorter tool life. The increase in cutting force was related to the increase of work hardening. The work material with a coarser martensite packet size showed a higher amount of work hardening that can explain the higher cutting force. The longer tool life in the workpieces with finer structure was correlated to smaller amplitude of the variation in cutting force.
| Original language | English |
|---|---|
| Pages (from-to) | 3613-3620 |
| Number of pages | 8 |
| Journal | Journal of Materials Science |
| Volume | 47 |
| Issue number | 8 |
| DOIs | |
| State | Published - Apr 2012 |
| Externally published | Yes |
Funding
Acknowledgements The authors gratefully acknowledge the financial support of Uddeholms AB, Vinnova within Vinnpro program, and CAPE research center. Rickard Sundström (Sandvik Tooling) is thanked for providing the cutting tools and helpful recommendations regarding machining tests. H. Hoseiny thanks the Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC) for providing the opportunity to carry out part of this investigation using their experimental facilities.