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

Authors : Barış ÖZLÜ, Halil DEMİR, Mustafa TÜRKMEN

Pages : 879-887

Doi:10.2339/politeknik.479345

View : 47 | Download : 20

Publication Date : 2019-12-01

Article Type : Research Paper

Abstract :In this study, the effect of mechanical properties and cutting parameters insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(Vc); insert ignore into journalissuearticles values(120, 150, 180, 210, and 240 m/min);, four different feed rates insert ignore into journalissuearticles values(fn); insert ignore into journalissuearticles values(0.04, 0.08, 0.12, and 0.16 mm/rev);, and four different depths of cut insert ignore into journalissuearticles values(ap); insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(Fc); and surface roughness insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(Ra); was obtained in the same workpiece.
Keywords : Hot forging, tempered steel AISI 5140, machinability

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