Laser weld-induced formation of amorphous Mn–Si precipitate in 304 stainless steel

Keyou S. Mao, Yaqiao Wu, Cheng Sun, Emmanuel Perez, Janelle P. Wharry

Research output: Contribution to journalArticlepeer-review

Abstract

We first report the formation of partially amorphous Mn–Si precipitates due to laser welding of face centered cubic (fcc) 304 stainless steel. Transmission electron microscopy and precession electron diffraction studies in the heat affected zone (HAZ) of the weldment indicate the formation of Mn–Si precipitates in grain interiors. Precipitates exhibit Mn–Si stoichiometry and the partially crystalline regions have a lattice constant of 0.45 nm. It is surmised that the rapid cooling rates during the laser weld melt pool solidification process may be sufficient to inhibit the complete crystallization of these precipitates.

Original languageEnglish (US)
Pages (from-to)174-177
Number of pages4
JournalMaterialia
Volume3
DOIs
StatePublished - Nov 2018
Externally publishedYes

Keywords

  • 304 stainless steel
  • Amorphous precipitation
  • Interface
  • Laser welding
  • Precipitation
  • Transmission electron microscopy

ASJC Scopus subject areas

  • General Materials Science

Fingerprint

Dive into the research topics of 'Laser weld-induced formation of amorphous Mn–Si precipitate in 304 stainless steel'. Together they form a unique fingerprint.

Cite this