Micro and nanohardness testing of laser welds

0436152 - FZÚ 2015 RIV RO eng J - Journal Article
Šebestová, H. - Čtvrtlík, Radim - Chmelíčková, H. - Tomáštík, J.
Micro and nanohardness testing of laser welds.
Romanian Academy. Proceedings. Series A. Roč. 15, č. 3 (2014), s. 247-253. ISSN 1454-9069
R&D Projects: GA TA ČR TA01010517
Institutional support: RVO:68378271
Keywords : Vickers microhardness * depth sensing indentation * laser welding
Subject RIV: JP - Industrial Processing
Impact factor: 1.658, year: 2014

Local mechanical properties of pulsed Nd:YAG laser bead-on-plate welds on 0.6 thick AISI 304 stainless steel were investigated. Conventional Vickers micro-hardness, based on measurement of dimension of residual indent, and depth sensing nanoindentation were used. Measurements were performed on both transversal and longitudinal weld cross sections. Seam welds performed with the pulsed laser reached very inhomogeneous microstructure resulting from the principle of successive pulses landing on the material surface whereas each pulse partially overlaps and re-melts the area melted by the previous one. This led to the fluctuations in both Vickers microhardness and indentation hardness of the weld metal.
Permanent Link: http://hdl.handle.net/11104/0239945