Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (6): 423-431.DOI: 10.11890/1006-7191-116-423

• 研究论文 • 上一篇    下一篇

Effect of W on Microstructure of high strength and toughness Steels

路妍1,苏杰2,王军华谢刚4,杨卓越   

  • 收稿日期:2011-04-01 修回日期:2011-06-24 出版日期:2011-12-25 发布日期:2011-12-22
  • 通讯作者: 路妍

Effect of W on microstructure of high strength and toughness steels

Yan LU1,2, Jie SU2, Junhua WANG3, Gang XIE1,Zhuoyue YANG2   

  1. 1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,Kunming 650093, China
    2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China
    3. Department of Electrical Engineering, Henan Industrial School, Zhengzhou 450053, China
  • Received:2011-04-01 Revised:2011-06-24 Online:2011-12-25 Published:2011-12-22
  • Contact: Junhua WANG3

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Abstract: The effect of W on the microstructure and the mechanical properties of ultrahigh strength low alloy steels was carried out. The microstructure of 30Cr3Si2Mn2NiMoNb and 30Cr3Si2Mn2NiMoNbW steels under quenched conditions were investigated by metallographic microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), and transmission electron microscope (TEM). Thermodynamic calculation was also conducted. The results showed that the addition of W made undissolved carbides more and finer, which exerted strong pinning force on migrating packet boundary and improved tensile strength significantly. M6C particles in 30Cr3Si2Mn2NiMoNb steel were disappeared above 1193 K, while the M6C particles in 30Cr3Si2Mn2NiMoNbW steel were disappeared above 1253 K, the calculation results were in agreement with the experimental.

Key words: High strength and toughness steel, Tungsten, Microstructure, Undissolved carbides, Thermodynamic calculation