Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (3): 176-184.DOI: 10.11890/1006-7191-103-176

• 研究论文 • 上一篇    下一篇

低碳鱼尾板组织和力学性能

Fumin Xu 1,Kai Wen2,Yi Tan2   

  1. 1. Dalian University of Technology
    2. 大连理工大学材料科学与工程学院
  • 收稿日期:2009-09-21 修回日期:2010-03-24 出版日期:2010-06-25 发布日期:2010-10-14
  • 通讯作者: Yi Tan

Microstructures and Mechanical Properties of Low Carbon Fishplate Materials

Fumin Xu ,Kai Wen,Yi Tan†   

  1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2009-09-21 Revised:2010-03-24 Online:2010-06-25 Published:2010-10-14

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摘要： 研究了两种新型非调质贝氏体鱼尾板材料常温和低温拉伸性能和冲击性能。研究结果表明：两种材料的显微组织分别为晶粒细小的粒状贝氏体和准贝氏体，常温和低温下材料的拉伸、冲击性能均高于国内现用的B7钢及日本鱼尾板材料，在室温和-55℃下材料A的屈服强度分别为722MPa，738MPa，伸长率分别为60.7％和41.7％；材料B的屈服强度分别为568.5MPa，700 MPa，伸长率分别为63.5%和67.1%。主要强化方式为固溶强化、复相强化、细晶强化、位错强化等。

关键词: 鱼尾板, 力学性能, 强韧性

Abstract: In the present research, two kinds of low carbon bainite materials were developed for fishplate usage. Their microstructure and mechanical properties were measured in detail. The results showed that one material was composed of fine granular bainite with the yield strengths of 722 MPa at room temperature and 738 MPa at -55oC, the elongation percentages of 60.7% and 41.7% respectively. The other one had a meta-bainite microstructure with corresponding strengths of 568.5 MPa and 700 MPa, the elongation percentages of 63.5% and 67.1%. These values are all superior to the home-made B7 steel and the fishplate materials made in Japan. The major strengthening mechanisms were discussed and contributed to the solid solution, complex phases, fine grain and dislocation strengthening.