Machinability of Inconel 718 in MQL turning using hybrid microwaved silicon nitride inserts
Machining Inconel 718 requires high strength inserts with high hot hardness and is challenging due to its high strength and thermal stability. Nonetheless, high wear rates, frequent tool change, extra time and increased tool cost are anticipated despite using large amounts of ecologically...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Malaysian Tribology Society
2024
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/114738/7/114738_Machinability%20of%20Inconel%20718.pdf http://irep.iium.edu.my/114738/ https://jurnaltribologi.mytribos.org/v42/JT-42-231-248.pdf |
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| Summary: | Machining Inconel 718 requires high strength inserts with
high hot hardness and is challenging due to its high
strength and thermal stability. Nonetheless, high wear
rates, frequent tool change, extra time and increased tool
cost are anticipated despite using large amounts of
ecologically unfriendly synthetic cutting fluids. Several
options on using vegetable oils and Minimum Quantity
Lubrication (MQL) were explored but not with microwave
treated inserts. This study intends to investigate using
eco-friendly options such as dry and MQL turning on
Inconel 718 with untreated and hybrid microwaved
(HMW) treated Si3N4 inserts at 200C for 15 minutes. The
cutting speed (145 m/min), feed rate (0.08mm/rev) and
depth-of-cut (0.1 mm) remained constant. The tool wear
and surface roughness were measured and the efficacy of
the HMW treatment was analyzed. In dry turning, Si3N4
(HMW) performs better with reduced flank wear by
13.85% than the Si3N4 (untreated) insert. Meanwhile, in
MQL turning, the Si3N4 (HMW) had decreased flank wear
by 30.53% when compared to the Si3N4 (untreated) insert.
The surface roughness from MQL turning using the Si3N4
(HMW) was much lower (0.53m) than the Si3N4
(untreated) (0.85m). The Si3N4 (HMW) insert was found
to be appropriate for MQL turning, but unsuitable for dry
turning of Inconel 718 due to excessive tool wear. |
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