Applications of Cryogenic Treatment for Enhancing the Machining Properties of Titanium Alloy (TI-6AL-4V)

An attempt has been made to apply cryogenic treatment for enhancing the machining characteristics of titanium alloys by cryo-treatment of work piece and tool in end milling operation. Further best r.p.m range for titanium alloy (Ti-6Al-4V) with H. S. S tool has been established. The specimen selected was a cryogenic treated cylindrical rod of 13 mm diameter, for which a cryogenic treated H. S. S end mill of 5mm diameter has been used to generate 2mm deep cavity. The mechanical properties have been observed to find the best range of machining. The results indicate that the best machining range comes out between 300-500 rpm. The results of the study shows that, Ra value improves by 47.91%, surface hardness increases by 2.25%, metal removal rate increases by 4.38% and tool wear rate decreases by 52.9%. The results of the study are also supported by photomicrographs.