Effect of interstitial carbon and nitrogen on corrosion of FeCoCrNi multi-principal element alloys made by selective laser melting

作者：Chen, Wenyu; Zhou, Rui; Li, Wanpeng; Chen, Yen-Hsiang; Chou, Tzu-Hsiu; Wang, Xu; Liu, Yong; Zhu, Yuntian^*; Huang, J. C.^*

来源：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2023, 148: 52-63.

DOI：10.1016/j.jmst.2022.10.027

• Selective laser melting
• Interstitial element
• Multi-principal element alloys
• Acid corrosion

The corrosion behaviors of selective laser melted (SLMed) FeCoCrNi multi-principal element alloys (MPEAs) with carbon or nitrogen addition in 0.5 M H2SO4 solution were investigated. Both C and N ad-dition refined the grains and introduced a heterogeneous structure in SLMed FeCoCrNi MPEA, but they had opposite effects on the corrosion behavior. The doped carbon participated as nano-sized carbides in SLMed MPEA, and localized galvanic corrosion occurred, degrading the corrosion resistance. The doped nitrogen was gathered with chromium and formed CrN chemical clusters in SLMed MPEA, and a protec-tive passive film with a higher Cr2O3/Cr(OH)3 ratio formed, which improved corrosion resistance.

• 单位
  中山大学