Tribological behaviour of thin film coatings against high strength steels Online publication date: Thu, 02-Apr-2009
by Bhadpiroon Sresomroeng, Komgrit Lawanwong, Varunee Premanond, Ratchnee Hato, Pongpan Kaewtatip, Anak Khanchawana, Nobuhiro Koga
International Journal of Abrasive Technology (IJAT), Vol. 2, No. 3, 2009
Abstract: The non-coated ball (SKD11; hardness 60 ± 2 HRC), balls coated with TiC-CVD, TiAlN-PVD, TiCN-CVD, TiCN-PVD and ball treated by VC-TD (thermal diffusion) have been evaluated in sliding contact against the disk which was made from automobile structural steel grade SAPH 440 and high strength steel grade SPFH 590. It was found that non-coated ball showed maximum specific wear rate and TiCN-CVD coated ball exhibited minimum specific wear rate. The effectiveness of hard thin film coated tool in metal stamping process is also investigated by performing U-bending experiment. In the case of non-coated tool, the result showed that adhesion of workpiece material on a die face was detected after 49 strokes for SPFH 590 steel. Whereas no adhesion was found on the tool coated with TiCN-CVD after 500 strokes. In order to understand the phenomenon, scratch tests were done on each type of coated tool to characterise the adhesion strength.
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