Title: Tribological behaviour of thin film coatings against high strength steels

Authors: Bhadpiroon Sresomroeng, Komgrit Lawanwong, Varunee Premanond, Ratchnee Hato, Pongpan Kaewtatip, Anak Khanchawana, Nobuhiro Koga

Addresses: Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha U-tit Rd. Bangmod Thungkru, Bangkok, 10140, Thailand. ' Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha U-tit Rd. Bangmod Thungkru, Bangkok, 10140, Thailand. ' Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha U-tit Rd. Bangmod Thungkru, Bangkok, 10140, Thailand. ' Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha U-tit Rd. Bangmod Thungkru, Bangkok, 10140, Thailand. ' Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha U-tit Rd. Bangmod Thungkru, Bangkok, 10140, Thailand. ' Faculty of Engineering, King Mongkut's University of Technology Thonburi, 126 Pracha U-tit Rd. Bangmod Thungkru, Bangkok, 10140, Thailand. ' Faculty of Engineering, Department of Mechanical Engineering, Nippon Institute of Technology, Japan, 4-1 Gakuendai, Miyashiro-machi, Minamisaitama-gun, Saitama Pref., 345-8501, Japan

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.

Keywords: thin film coatings; high strength steel; wear rate; U-bending die; tribology; sliding contact; automotive structural steel; metal stamping; adhesion strength.

DOI: 10.1504/IJAT.2009.024401

International Journal of Abrasive Technology, 2009 Vol.2 No.3, pp.313 - 328

Published online: 02 Apr 2009 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article