Hits:

Indexed by:会议论文

Date of Publication:2011-01-01

Included Journals:Scopus

Page Number:547-551

Abstract:Based on the welding request during the coolant pump manufacture in the nuclear industry, the pulsed laser welding of 0.5 mm Hastelloy C-276 was investigated and the weld joint of less than 1mm was obtained. Then, the analysis of weld joints shape, the tensile test and XRD test of fracture were conducted. The results indicated that the thin Hastelloy C-276 could be joined by the pulsed laser with the flat weld joint which was related to the convection effect in the melting pool. The yield strength of as-welded sample was the same as that of base metal, and the tensile strength was nearly 90% of that of base metal. The same yield strength was due to the similar effect of solution strength and refining grain, and the reduced tensile strength of welded sample was attributed to the favorable formation of micro-fracture which stemmed from the abundant voids induced by the rapid solidification of laser welding. In addition, there were no enrichment of brittle phase, and the single fcc austenite was still the main phase in the weld joint.