Abstract
In this paper, the influence of the aging process on the microstructure and machinability of Corrax Steel was investigated for four samples: a solution heat-treated (A0) and three samples aged at 400ºC (A4), 525ºC (A5.25) and 600ºC (A6) for four hours. The effect of aging temperature on hardness was examined. Machining tests were carried out using a CNC lathe with a multi-layer coated PVD (AlTiN) cutting tool, at various cutting speeds (50, 100, 150, 200, 250, 300, 350m/min) with constant feed rate (0.1mm/rev) and 1mm constant cutting depth. The microstructure was investigated using an optical microscope and EDS attached SEM. The effect of aging on reverted austenite formation was also evaluated. In order to understand the changes in surface topology, cutting forces and vibrations were measured. With increasing aging temperature, the lath martensite was transformed to plate martensite because of the formation of precipitates and reverted austenite. Aging at different temperatures increased hardness up to 58%, cutting forces up to 117% and surface roughness up to 450%. The results describe the effect of the aging treatment on cutting forces, surface topology, tool wear and vibrations.
Highlights
Investigation of martensitic steels started in USA during the 60’s
This study investigated the machinability of solution heat treated and aged at three different conditions Corrax steel, under different cutting speeds, in order to understand the effect of aging on its microstructure, hardness, and machinability
Three different measurements were made on each surface and their average was accepted as the surface roughness value
Summary
Investigation of martensitic steels started in USA during the 60’s. Martensitic steels have low carbon and have high strength and corrosion resistance [1]. Low feed rate and middle tool nose (0.8mm) generated minimum surface roughness value (0.447μm). The outcomes showed that the increase of temperature decreased cutting forces, reduced tool wear, and improved surface topology. The effects of different types of cutting fluid on cutting temperature, chip thickness, surface roughness, cutting forces and shear angle were investigated in [12]. Guldibi & Demir: Aging Effect on Microstructure and Machinability of Corrax Steel decreased cutting forces because of the heat generated on the cutting zone. Under cryogenic cutting conditions, increasing cutting speed caused higher decrease in cutting forces, because of the improved lubrication. This study investigated the machinability of solution heat treated and aged at three different conditions Corrax steel, under different cutting speeds, in order to understand the effect of aging on its microstructure, hardness, and machinability
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