期刊
ENGINEERING FRACTURE MECHANICS
卷 75, 期 18, 页码 5113-5121出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2008.07.007
关键词
Fracture toughness; Nanostructured materials; Railway wheels; Bainite; Pearlite
类别
资金
- Ministry of Railway
- National 863 Projects
This paper describes nanostructured railway wheels made of Si-Mn-Mo-V low-carbon steel through an advanced metallurgy process and fabrication technology. The microstructure of the wheels, particularly in the rim portion, is composed of carbide-free bainite that consists of bainitic ferrite laths and retained austenite films along the lath boundaries. The thickness of the laths and films is in nanometer scale. For comparison, traditional pearlite-ferrite wheel steels are also investigated. Test results show that carbide-free bainite steel is superior to pearlite-ferrite steel not only in yield strength but also in fracture toughness. Theoretical explanation of these phenomena is also elucidated. (c) 2008 Elsevier Ltd. All rights reserved.
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