Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Hiroyoshi Tanaka Last modified date:2018.06.11

Assistant Professor / Machine Design and Bionic Systems / Department of Mechanical Engineering / Faculty of Engineering


Papers
1. takehumi Otsu, Hiroyoshi Tanaka, Joichi Sugimura, Effect of Slip on Permeation of Hydrogen into Steel in Cyclic Contact, Tribology letter, 10.1007/s11249-016-0691-x, 63, 4, 1-8, 2016.05, The amount of hydrogen in the steel specimens
obtained from a cyclic contact test was investigated in
order to understand the process of permeation of hydrogen
into the steel in rolling contact. Cyclic contact test with slip
was conducted in a sealed chamber, in which cyclic stress,
slip and surrounding gas were controlled. The amount of
hydrogen in the steel after the test was analysed by secondary
ion mass spectrometry. It was found that the
amount of permeated hydrogen after the test performed in
hydrogen gas was not greater than those after the tests in
dry air and vacuum condition. It was also found that the
oxide film and the hydroxide film were formed on the
contact area after the test in hydrogen gas. These results
suggested that the oxide film and the hydroxide film,
formed in the process of cyclic contact with slip, prevented
hydrogen from permeating into the steel..
2. Hiroyoshi Tanaka, Effect of Environmental Gas on Surface Initiated Rolling Contact Fatigue, Tribology Online, 8, 1, 90-96, 2013.01, This paper describes an exploratory study on the effects of temperature on the formation of oxide film and rolling contact fatigue life in hydrogen, argon and air. Rolling contact fatigue tests were conducted at 333 K and 363 K by using a three-ball-on-disk type apparatus. The rolling contact fatigue life in hydrogen was shorter than that in argon, and life in air was the longest. Relationship was found between fatigue life and hydrogen concentration in steel. Cross sections of the specimens show that iron oxide grew to larger grain size in the subsurface in hydrogen environment, which may have resulted in shorter fatigue life. It was also found that fatigue failure occurs on ball surface in hydrogen at 363 K..
3. Takefumi Otsu, Hiroyoshi Tanaka, Katsu Ohnishi and Joichi Sugimura, Simple Experiment on Permeation of Hydrogen into Steel in Cyclic Contact , Tribology Online, 10.2474/trol.6.311, 6, 7, 311-316, 2011.11.
4. Hiraku Tanimoto, Hiroyoshi Tanaka and Joichi Sugimura, Observation of Hydrogen Permeation into Fresh Bearing Steel Surface by Thermal Desorption Spectroscopy, Tribology Online, 10.2474/trol.6.291, 6, 7, 291-296, 2011.09.
5. Effects of Exposure to 40MPa Hydrogen on DLC Films.
6. Friction and wear of DLC films in hydrogen gas.
7. H. Tanaka, Y. Sawae, K. Fukuda, S. Yamagami, T. Morita, N. Izumi, J. Sugimura, New Experiment System for Sliding Tests in Hydrogen and Surface Analysis with Transfer Vessel, Tribology Online, 4, 4 (2009) 82., 2009.04.
8. Hiroyoshi Tanaka, Masaaki Hashimoto, Seigo Gondo and Yuji Yamamoto,, Friction and wear characteristics of molybdenum dithiocarbamate with alloy steels, Tribology online, Vol. 1 (2006), No.1 pp.9-13, 2006.10.