Heat treatment induced phase transition and microstructural evolution in electron beam surface melted Nb-Si based alloys

Yueling Guo, Lina Jia*, Bin Kong, Hui Peng, Hu Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The hardness, phase and microstructural development of Nb-18Si-24Ti-2Cr-2Al (at.%) alloys processed by electron beam surface melting (EBSM) and subsequent heat treatments were investigated. The EBSM experiments were performed using an electron beam based 3D printing system. Results showed that Nbss and Nb 3 Si phases were obtained via EBSM with a significantly refined microstructure. The eutectoid reaction of Nb 3 Si → Nbss + αNb 5 Si 3 was triggered by heat treatments (HT) at 1200 °C or 1450 °C for 5 h. The growth and the coarsening of αNb 5 Si 3 grains were promoted with a higher HT temperature. The hardness of the EBSM alloy was remarkably reduced by HT.

Original languageEnglish
Pages (from-to)417-420
Number of pages4
JournalApplied Surface Science
Volume423
DOIs
Publication statusPublished - 30 Nov 2017
Externally publishedYes

Keywords

  • Heat treatment
  • Intermetallics
  • Nb-Si alloy
  • Rapid solidification
  • Surface melting

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