GRAPHITISATION: A POTENTIAL NEW ROUTE TO FREEMACHINING STEELS
Designing a competitive free-machining steel composition enabling less expensive steelmaking,manufacturing and recycling has long been a desirable objective.Foremost amongst a new approach has been simply to promote graphite formation to act as an internal lubricant,thus reducing or eliminating the need for special alloying additions(e.g.Pb,S,P,Bi,Se,Te)which can make the steels difficult to process or re-cycle,and,as more stringent health and safety legislation is introduced might eventually lead to restrictions or total prohibition from certain manufactured products.However,the sluggish kinetics of graphite formation in steel does not lend itself to the normal requirement of rapid manufacturing in the high tonnage steel industry.In consequence,this paper reports the machining characteristics of experimental carbon steel with a composition which accelerates graphite formation during a high temperature anneal.Three starting microstructures prior to annealing have been considered; martensite,bainite and ferrite/pearlite.These influence the eventual graphite dispersion and hence the machinability characteristics.The machining characteristics have been measured and also compared with commercial free-cutting steel grades.
Free-machining Steel Tool Wear Graphite Ferrite/Pearlite Bainite Martensite
Aqil Inam Kejian He David Edmonds
Department of Metallurgy and Materials Engineering,College of Engineering and Emerging Technologies, Central South University,Changsa,Hunan,PR China Institute for Materials Research,School of Chemical and Process Engineering,University of Leeds,Leed
国内会议
杭州
英文
817-822
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）