J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (9): 1671-1675.DOI: 10.1016/j.jmst.2018.04.020

Special Issue: Stainless Steel & High Strength Steel 2018 材料计算 2018

• Orginal Article • Previous Articles     Next Articles

Role of Co in formation of Ni-Ti clusters in maraging stainless steel

Jialong Tianab, M. Babar Shahzadb, Wei Wangb*(), Lichang Yinbc*(), Zhouhua Jiangd, Ke Yangb   

  1. a School of Materials Science and Engineering, Northeastern University, Shenyang 110004, China
    b Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    c Shenyang National Laboratory for Materials Science, 72 Wenhua Road, Shenyang 110016, China
    d School of Metallurgy, Northeastern University, Shenyang 110004, China
  • Received:2018-02-02 Revised:2018-04-15 Accepted:2018-04-17 Online:2018-09-20 Published:2018-09-25
  • Contact: Wang Wei,Yin Lichang

Abstract:

The effect of Co addition on the formation of Ni-Ti clusters in maraging stainless steel was studied by three dimensional atom probe (3DAP) and first-principles calculation. The cluster analysis based on the maximum separation approach showed an increase in size but a decrease in density of Ni-Ti clusters with increasing the Co content. The first-principles calculation indicated weaker Co-Ni (Co-Ti) interactions than Co-Ti (Fe-Ti) interactions, which should be the essential reason for the change of distribution characteristics of Ni-Ti clusters in bcc Fe caused by Co addition.

Key words: Maraging stainless steels, Ni-Ti cluster, First-principles calculation, Three-dimensional atom probe