Machinability of Hard Martensitic Stainless Steel （硬马氏体不锈钢的切削加工性能）.pdf

Proceedings of the World Congress on Engineering 2011 Vol I WCE 2011, July 6 - 8, 2011, London, U.K. Machinability of Hard Martensitic Stainless Steel and Hard Alloy Steel by CBN and PCBN Tools by Turning Process S.Thamizhmanii and S.Hasan Abstract - Hard turning of martensitic stainless steel is is comparatively easier than stainless steel due to low carbon gaining importance in all manufacturing sectors like percentage and other alloying elements. Liew et al. [3] automobile and aerospace industries. Machinability of conducted study on cutting AISI 420 steel by using PCBN materials depends on surface roughness, tool wear, cutting tool. The tool wear was due to abrasion and cutting forces, specific cutting pressure and work material hardness. temperature. The porosity, ductility, and the bonding In this research hard martensitic stainless steel AISI 440 C strength of the grains in the tool, apart from its thermal and SCM 440 alloy steel was used as work materials. CBN conductivity have great influence on the fracture resistance and PCBN cutting tools were used to turn the work materials. of the tool. Fig.1. shows tool wear on single a point tool. The operating parameters used were cutting velocity 100, 125, 150, 175 and 200 m/min with feed rate of 0.10, 0.20 and 0.30 2. Experimental works mm/rev with constant depth of cut of 1.0 mm. The length of 2.1 Work materials turning was 150 mm and 750 mm. Machinability of