High temperature tribological behaviour of PVD coated tool steel and aluminium under dry and lubricated conditions  

作　　者：Justine DECROZANT-TRIQUENAUX Leonardo PELCASTRE Cedric COURBON Braham PRAKASH Jens HARDELL 

机构地区：[1]Division of Machine Elements,Lulea University of Technology,SE-97187,Sweden [2]Universite de Lyon,CNRS,Ecole Nationale d'lngenieurs de Saint-Etienne,LTDS UMR5513,F-42023,France [3]Department of Mechanical Engineering,Tsinghua University,Beijing,100084 China

出　　处：《Friction》2021年第4期802-821,共20页摩擦（英文版）

基　　金：Swerea IVF(now RISE)

摘　　要：Aluminium alloys are commonly used as lightweight materials in the automotive industry.This non-ferrous family of metallic alloys offers a high versatility of properties and designs.To reduce weight and improve safety,high strength-to-weight ratio alloys(e.g.6XXX and 7XXX),are increasingly implemented in vehicles.However,these alloys exhibit low formability and experience considerable springback during cold forming,and are therefore hot formed.During forming,severe adhesion(i.e.galling)of aluminium onto the die surface takes place.This phenomenon has a detrimental effect on the surface properties,geometrical tolerances of the formed parts and maintenance of the dies.The effect of surface engineering as well as lubricant chemistry on galling has not been sufficiently investigated.Diamond-like carbon(DLC)and CrN physical vapour deposition(PVD)coated steel have been studied to reduce aluminium transfer.However,the interaction between lubricants and PVD coatings during hot forming of aluminium alloys is not yet fully understood.The present study thus aims to characterise the high temperature tribological behaviour of selected PVD coatings and lubricants during sliding against aluminium alloy.The objectives are to first select promising lubricant-coating combinations and then to study their tribological response in a high-temperature reciprocating friction and wear tester.Dry and lubricated tests were carried out at 300℃ using a commercial polymer lubricant.Tests using DLC,CrN,CrTiN,and CrAIN coated tool steel were compared to uncoated tool steel reference tests.The initial and worn test specimen surfaces were analysed with a 3-dimensional(3D)optical profiler,scanning electron microscope(SEM)and energy dispersive X-ray spectroscope(EDS)as to understand the wear mechanisms.The results showed formation of tribolayers in the contact zone,reducing both friction and wear.The stability of these layers highly depends on both the coatings'roughness and chemical affinity towards aluminium.The DLC and CrN coatings combined wi

关 键 词：high temperature tribology aluminium LUBRICATION physical vapour deposition(PVD)coatings material transfer ADHESION 

分 类 号：TG146.21[一般工业技术—材料科学与工程] O313.5[金属学及工艺—金属材料]