著者

井上 靖雄 佐藤 幸雄 柏谷 賢治

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.38, no.429, pp.601-606, 1989-06-15 (Released:2009-06-03)

参考文献数

9

被引用文献数

1 1

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Rolling contact fatigue tests are performed by using cylindrical test pieces taken out of rail, under conditions of slip ratio 0%, Hertz' contact stress 1.2GPa, velocity 60km/hr and water lubrication. The behavior of plastic deformation below the contact surface of the test piece is analyzed with an X-ray device and a transmission electron microscope. The results indicate that the dislocation density increases, while a preferred orientation texture and a cell structure emerge in the contact surface layer with an increase in the number of cycles of rolling contact fatigue. Slip deformation of crystal is accelerated further when fatigue progresses to a number of cycles larger than a specific value and then so called “shelling” grows with a remarkable development of the texture in either the rail or the wheel.

著者

柏谷 賢治 井上 靖雄 佐藤 幸雄 松山 晋作

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.36, no.407, pp.786-791, 1987-08-15 (Released:2009-06-03)

参考文献数

14

被引用文献数

4 4

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In order to clarify the mechanism of initiation of rolling contact fatigue cracking, so called shelling, on the running surface of rails in railway track, the characteristics of the deformed rail surface layer have been investigated by means of electron microscopes (SEM, TEM) and X-ray apparatus comparing the rolling-contacted test pieces and cold-rolled test pieces. A texture is formed as a result of the simple slip deformation of crystals in the deformed surface layer of rails used in track and the rolling contact fatigue-tested rails. This texture disappeared at the topmost surface because of the occurence of some random plastic deformation. On the contrary, the texture of the cold-rolled test pieces results from the complex slip deformation of crystals and does not disappear at the surface.