The Effect of Mechanical Properties and the Cutting Parameters on Machinability of AISI 5140 Steel Cooled at High Cooling Rates After Hot Forging

Year 2019, Volume: 22 Issue: 4, 879 - 887, 01.12.2019

Barış Özlü , Halil Demir , Mustafa Türkmen

https://doi.org/10.2339/politeknik.479345

Cited By: 7

Abstract

In this study, the effect of mechanical properties and cutting
parameters (Cp) on the machinability of AISI 5140 steel cooled at high cooling
rates after hot forging was investigated. The microstructural examinations and
hardness measurements of the as-received AISI 5140 steel and the workpieces
cooled in the oil and polymerized water after hot forging were performed. Turning
process was conducted by using a coated ceramic tool at five different cutting
speeds (Vc) (120, 150, 180, 210, and 240 m/min), four different feed rates (fn)
(0.04, 0.08, 0.12, and 0.16 mm/rev), and four different depths of cut (ap)
(0.4, 0.6, 0.8, and 1 mm) under dry machining conditions. SEM examinations of
the cutting tools were also performed. It was seen from the results that the
changing microstructure and hardness values had a significant effect on cutting
forces (Fc) and surface roughness (Ra) from the Cp depending on cooling rate.
While the highest Fc were reached in the workpiece with the highest hardness
cooled in the polymerized water after hot forging,
the lowest surface roughness (Ra) was obtained in the same workpiece.

Keywords

Hot forging, tempered steel AISI 5140, machinability

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