Dry Turning with Niobium Carbide Based Tools
Niobium carbide(NbC)offers a competitive functional profile compared to tungsten carbide(WC)as cutting material regarding its wear resistance preferably in metal cutting processes.Investigations of uncoated NbC compositions are conducted in carbon steel C45E(SAE 1050,176 HV1),high tensile steel 42CrMo4+QT(AISI 4140,572 HV1)and aluminum alloy AlSi9Cu4Mg(AlSi9)under dry cylindrical turning conditions with semi-finishing process parameters.The compositions NbC0.88-12Co(sub-stoichiometric NbC),(NbC1.0-TiC)-6Ni7.5VC(stoichiometric NbC)and NbC1.0-12Ni4Mo4VC(stoichiometric NbC),produced under different sintering conditions,were employed to assess their performance towards an industrial reference cemented carbide(WC-Co).In dependence of varying cutting speeds vc,the flank wear width VB is used as tool life criteria.A percentage decrease in cutting time tc of up to 173%in C45E and 289%in 42CrMo4+QT compared to WC-6Co is achieved.For AlSi9Cu4Mg,the performance of WC-6Co is only reached once with a 14%higher cutting time tc.Due to the functional properties such as the retention of hot hardness,a low solubility and the formation of a stable Nb2O5 tribo-layer during machining,NbC demonstrates great potential as a hard phase in cutting iron-based alloys.
Turning Semi-finishing Niobium carbide Tungsten carbide Iron-based alloys Aluminum
Uhlmann E. Meier P. Hinzmann D. Kropidlowski K. Prasol L. Woydt M.
Institute for Machine Tools and Factory Management(IWF),Technische Universit(a)t Berlin,Pascalstr.8- Division 6.3 Tribology and Wear Protection,BAM Federal Institute for Materials Research and Testing,
国际会议
北京
英文
775-784
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）