Effect of Nitride Coatings on the Wear and Fatigue Behavior of Titanium Alloy Ti-6A1-4V
The lifespan of titanium engineering parts can be significantly reduced by wear damage. Protective coatings may improve wear resistance, however,coatings are known to adversely affect the fatigue behavior of titanium alloys leading to a fatigue debit to be considered by the designer. The relevant damage mechanisms have not yet been fully explored. The present study will shed light on the coating-substrate interplay. Two different coating deposition techniques and their effect on the fatigue behavior of titanium Ti-6A1-4V were investigated and compared. TiN coatings were produced by physical vapor deposition and gas nitriding. The mechanical properties of the coated titanium alloy were determined by static tensile and fatigue tests; wear behavior was characterized using ball-on-disk testa PVD coatings led to reduced fatigue strength whereas the gas nitride coating showed no effect Post-failure analysis revealed that the coating microstructure strongly influenced the failure mode. Moreover, the coating thickness, hardness, roughness and the residual stresses in the coating played an important role. According to the experimental results, the fatigue resistance: of the bulk titanium alloy was mainly affected by residual stresses in the coating and across the coating-substrate interface. Coating microstructure variations resulted in property changes of the coating which in turn altered the fatigue response of each coating-substrate system.
Ti-6Al-4V titanium nitride (TiN) gas nitriding physical vapor deposition fatigue wear
Ronny Steinert Janny Lindemann Christoph Leyens
Technical University of Brandenburg at Cottbus, 03046 Cottbus,Germany Technische Universitdt Dresden, 01062 Dresden ,Germany
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
858-861
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）