Effect of Inter-Critical Heat Treatment on Mechanical Properties and Machining Parameters of Mild Steel

The surface roughnesses of the annealed and intercritically heated sample were evaluated after turning operation on the lathe and correlated with the mechanical properties and microstructure. The turning were performed on center lathe with speed of 480 RPM and feed rate of 0.63 mm per revolution and the surface roughness were measured on the optical profilometer. The specimen with higher ductility showed a lower surface roughness than the specimen with lower ductility. Phase morphology also affects the surface roughness.