The microstructural characterization of both weld beads and heat affected zones (HAZ) was carried out on austenitic (AISI 304, 316) and duplex (UNS 31803) stainless steels, laser welded under various working parameters (power, traverse speed, shielding gas), by means of light microscopy, SEM, TEM, and image analysis, with the aim of pointing out changes in the amounts of the present phases, with respect to those predicted by equilibrium diagrams. Moreover, an analytical thermal model of laser beam welding was employed in order to evaluate the cooling rates involved in the process. The thermal field analysis, checked by comparing the calculated and the actual weld beads, has been used as a tool aimed at correlating cooling rates and microstructural characteristics.
RAPID SOLIDIFICATION IN LASER-WELDING OF STAINLESS-STEELS
ZAMBON, ANDREA;BONOLLO, FRANCO
1994
Abstract
The microstructural characterization of both weld beads and heat affected zones (HAZ) was carried out on austenitic (AISI 304, 316) and duplex (UNS 31803) stainless steels, laser welded under various working parameters (power, traverse speed, shielding gas), by means of light microscopy, SEM, TEM, and image analysis, with the aim of pointing out changes in the amounts of the present phases, with respect to those predicted by equilibrium diagrams. Moreover, an analytical thermal model of laser beam welding was employed in order to evaluate the cooling rates involved in the process. The thermal field analysis, checked by comparing the calculated and the actual weld beads, has been used as a tool aimed at correlating cooling rates and microstructural characteristics.Pubblicazioni consigliate
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