| High carbon Cr-V and Cr-Ti alloy steels based on 0.75%-0.76% C were manufactured for trial and their mechanical properties and microstructures were investigated metallographically, and then studied on the fitness of these alloy steels as the rail materials for high speed railroad. According to experimental results, their tensile strength, yield strength, and hardness were 120-130㎏/㎟, 85-90㎏/㎟, 350-370 H_B respectively, and the amount of wear was half as much as normal carbon rail steels`, but their microstructures were largely different from each other. It was concluded that high carbon Cr-V and Cr-Ti alloy steels appear to have mechanical properties suitable for rail materials of high speed railroad, and good properties such as high strength and hardness of the high carbon Cr-V steel will be attributed to its fine pearlite microstructure which were distributed densely. |
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