Experimental Study on surface roughness and quality of Hybrid MQL and Thermally-Enhanced Turning of Stainless Steel 17-4 PH (AISI 630)

17-4 ph stainless steel is one of the high strength stainless steel that is widely used in military, oil and gas industries, which has many problems due to its high strength, such as other new and high strength materials face to a lot of problems. Due to the great improvement in material properties especially their strength and hardness in recent years, this has become more evident. The use of controlled heat source along with machining (hot machining) (heat-assisted machining) has been introduced as an efficient way for machining hard-cutting materials. This also significantly improves the process output parameters. Minimum quantity lubrication (MQL) has been used to eliminate other dangers, such as tool wear and high-temperature infiltration. The surface roughness as an important parameter in machining due to its high strength and hardness is one of the challenges of machining this steel. Using this method, surface integrity has improved significantly. In this study, the effect of cutting velocity, feed rate and applied temperature on the surface have been investigated on the surface integrity. The surface roughness has been improved by using a hybrid machining up to 70 to 100%, as well as a uniform surface roughness profile. The hybrid machining has shown that all surface imperfections, such as tricks and microcracks, sticking particles Eliminates at the surface, which can indicate a dramatic improvement in fatigue strength.