Metallurgical Abstracts on Light Metals and Alloys vol.55

Combined Effect of Gas Blow Induction Heating Nitriding and Post-treatment with Fine Particle Peening on Surface Properties and Wear Resistance of Titanium Alloy

Shogo Takesue*, Shoichi Kikuchi**, Yoshitaka Misaka***, Tatsuro Morita* and Jun Komotori****
*Department of Mechanical Engineering, Kyoto Institute of Technology, Kyoto 606-8585
**Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University, Hamamatsu 432-8561
***Research and Development Center, Neturen Co., Ltd., Hiratsuka 254-0013
****Department of Mechanical Engineering, Keio University, Yokohama 223-8522

[Published in Materials Transactions, Vol.62(2021), pp. 1502–1509]

https://doi.org/10.2320/matertrans.Z-M2021845
E-mail: komotori[at]mech.keio.ac.jp
Key Words: fine particle peening, induction heating, nitriding, titanium alloy, residual stress, wear resistance

In order to fabricate a titanium alloy with superior wear resistance and fatigue strength, fine particle peening (FPP) was introduced as a post-treatment after gas blow induction heating (GBIH) nitriding. The surface characteristics of the treated alloy were examined using X-ray diffraction, scanning electron microscopy, laser microscopy and a micro-Vickers hardness tester. GBIH nitriding and post-treatment with FPP formed nitrided layers with high hardness and compressive residual stress at the surface of the alloy within a short period of time. This is due to the diffusion of nitrogen atoms during GBIH nitriding and plastic deformation of the surface layer during FPP. Reciprocating ball-on-disk wear tests were performed to investigate the wear resistance of the surface-treated alloy. The wear resistance of the titanium alloy was improved by the proposed surface treatment compared with samples that were only polished or FPP-treated. This is due to the presence of a nitrogen compound layer with high hardness at the surface. The abrasiveness toward the wear test counter material was also decreased by the combined surface treatment.

Schematic illustration of surface modified layers created and wear behavior of Gas Blow IH nitriding(N series), FPP treated(F series), and GBIH nitride with post-treatment with FPP(N+Fseris) specimens.