Internal Friction in Rail Waist of BNb and BNbRE Steels
来源期刊：JOURNAL OF RARE EARTHS2005年第4期
论文作者：Yu Ning Ren Xinjian Sun Zhenyan Ji Jingwen WANG Yunsheng
Key words：material physics; mechanical spectrum; internal friction; rail steel; rare earths;
Abstract: The internal frictions of the specimens in the waist centre of the commercial BNb and BNbRE rails, which were left in air for two years, were measured. It is found that there is an obvious Snoek-Kê-Kster (SKK) peak in both steels, and still exists a measurable deformation-enhanced Snoek peak(DESP) in the specimens of the BNbRE steel. The internal frictions in the deformed specimens of the both steel rails were also measured. Unlike the case of the tread specimens showing a decrease of SKK damping due to deformation, the SKK damping of the rail waist specimens increases after deformation; and the specimens containing rare earth(RE) show more noticeable damping increase than those without RE. The results of the internal friction measured during ascending and descending temperature under 700 ℃ show that there is a high temperature damping which can be completely disappeared during descending temperature for both steels.
Yu Ning1，Ren Xinjian2，Sun Zhenyan1，Ji Jingwen1，WANG Yunsheng2
(1.College of Sciences, Northeastern University, Shenyang 110004, China;
2.Research Institute of Iron and Steel, Baotou Iron and Steel Co., Baotou 014010, China)
Abstract:The internal frictions of the specimens in the waist centre of the commercial BNb and BNbRE rails, which were left in air for two years, were measured. It is found that there is an obvious Snoek-Kê-Kster (SKK) peak in both steels, and still exists a measurable deformation-enhanced Snoek peak(DESP) in the specimens of the BNbRE steel. The internal frictions in the deformed specimens of the both steel rails were also measured. Unlike the case of the tread specimens showing a decrease of SKK damping due to deformation, the SKK damping of the rail waist specimens increases after deformation; and the specimens containing rare earth(RE) show more noticeable damping increase than those without RE. The results of the internal friction measured during ascending and descending temperature under 700 ℃ show that there is a high temperature damping which can be completely disappeared during descending temperature for both steels.
Key words:material physics; mechanical spectrum; internal friction; rail steel; rare earths;
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