Acta Metallurgica Sinica (English Letters) ›› 2000, Vol. 13 ›› Issue (4): 974-980.
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Z.L. Ding; Y.C. Fan; H.B. Qi; D.L. Ren; J.B. Guo and Z.Q. Jiang Shijiazhuang Railway Institute, Shijiazhuang 050043, China