Effect of heat treatment on bonding characteristics and interfacial microstructures in explosively welded Ti/SUS430 stainless steel clad

Yasuhiro Morizono, Minoru Nishida, Akira Chiba, Kihachirou Imamura

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Abstract

Effect of heat treatment on bonding characteristics and interfacial microstructures in explosively welded titanium/SUS430 ferritic stainless steel clad was investigated. The average shear strength of the clad annealed at 1073K for 3.6 ks was 338 MPa and was equivalent to about 60% of that of an as-welded clad. The strength of the clad annealed at 1073K gradually decreased to 242 MPa with increasing holding time up to 360ks. The same tendency was obtained from the clad annealed at 1173K. On the other hand, the strength of the clad annealed at 1273K drastically decreased to 107 MPa with increasing holding time up to 360ks. The clad annealed at 1073 and 1173K yielded TiC layer at the bonding interface, while the reaction layer in the clad annealed 1273K consisted of TiC, FeTi, Fe2Ti and χ (Fe29Cr13Ti8) from titanium side. It was noted that chromium existed in the Fe2Ti, which has wide solubility limit for chromium, and χ compounds formed at the SUS430 side. The TiC layer in the former clads acts as a barrier for diffusion of titanium, iron and chromium across the bonding interface and prevents the growth of intermetallic compounds. The clad formed TiC layer at the bonding interface preserved high bonding strength even after prolonged annealing.

Original languageEnglish
Pages (from-to)340-345
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume85
Issue number4
DOIs
Publication statusPublished - Jan 1 1999
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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