The effect of the martensitic packet size on the machinability of modified AISI P20 prehardened mold steel |
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| Authors: | H Hoseiny F G Caballero B Högman D San Martin C Capdevila L -G Nordh H -O Andrén |
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| Affiliation: | 1.Research and Development,Uddeholms AB,Hagfors,Sweden;2.Department of Physical Metallurgy,Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC),Madrid,Spain;3.Department of Applied Physics,Chalmers University of Technology,G?teborg,Sweden |
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| 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. |
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