A review of the use of cryogenic coolant during machining titanium alloys

Titanium alloys are considered difficult-to-machine materials, and much effort has been made to improve their machinability through various approaches. The use of cryogenic coolants during machining, sometimes referred to as cryogenic machining, is a popular environmentally friendly technique that promises to reduce cutting zone temperatures, reduce friction, and enhance tool life during machining operations. This review article explores the use of cryogenic coolants during titanium machining and presents an overview of research progress and knowledge gaps. The various coolants and methods for cryogenic machining are reviewed, along with the effectiveness of these methods in terms of key machinability criteria, including tool wear, tribological properties, and heat transfer. Issues in sustainability are also explored.