Abstract
Hard turning technique is new and the management of this process is still limited. AISI 440 C martensitic stainless steel and SCM 440 are alloy steel used as work piece materials for this research work. The stainless steel is difficult to cut material, low thermal conductivity, tendency to form built up edges at tool edge and less corrosion resistant where as SCM 440 is high strength material. The flank wear formed on CBN by stainless steel was more than alloy steel. The crater wear formed on CBN tool while turning stainless steel than alloy steel. The chips produced by stainless steel were saw tooth form and SCM 440 alloy steel did not produce saw tooth chips. Flank wear and crater wear were caused by severe abrasion and also by high heat generated during turning on stainless steel. The flank wear and temperature also contributed on cutting forces on both materials, but very little on stainless steel and more on alloy steel.
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