EBSD study of solidification characteristics of austenitic stainless steel weld pool

Abstract

This present paper studied the solidification characteristics of a high Fe-Cr-Ni austenitic stainless steel weld pool using an EBSD system. The results revealed that the crystallography of the weld metal grains was affected by both the heat affected zone (HAZ) base metal grains at the fusion boundary and the thermal condition in weld pool. It exhibited an orientation relationship of ,100. // ,100. and {100} // {100} between the HAZ base metal and weld metal along the fusion boundary, which was resulted from the epitaxial growth in the weld pool. Additionally, a high fibre texture ,100. toward the weld centreline was determined by the effect of the competitive mechanism at the beginning of the weld solidification.

Laser Welding of AISI 316L Stainless Steel Produced by Additive Manufacturing or by Conventional Processes

“…On one hand, irrespective of the elaboration process and surface roughness, for both samples, a dendritic growth with a dendrite composition corresponding to austenite and interdendritic space composition corresponding to ferrite was observed. The Creq/Nieq ratio (around 1.6 here) leads to a ferritic-austenitic mode of solidification resulting in a ferritic skeleton at room temperature [46]. Moreover, similar dendrite thicknesses in the fusion zone were measured, implying similar cooling rates.…”