Duplex stainless steels are preferred in industries where a combination of mechanical properties with higher corrosion resistance is required. Their excellent properties are due to the biphasic microstructure, however, when thermal cycles are applied can be highly affected by the formation of hazardous intermetallic phases decreasing their performance. Welding as beneficial can be detriment for joining stainless steels; moreover, some welding processes are limited for narrow thicknesses or the electrode can promote intermetallic phases. Laser welding is an advanced joining process that is currently replacing traditional fusion processes, besides it can be employed to join thin plates. The aim of this study is to observe the plates of 2304 DSS plastically deformed joined by pulsed laser welding varying the peak power in order to observe the microstructural modifications and penetration of the joint. The experiments were performed by fixing some laser welding parameters in order to observe only the influence of the peak power. Microstructural observations by means of optical and electron microscope were performed, within EDS analysis to identify possible intermetallic phases. Microhardness evaluation was performed observing variations mainly at the surface.
Lean duplex stainless steel plastically deformed joined by laser welding
Calliari I.;Gennari C.;
2017
Abstract
Duplex stainless steels are preferred in industries where a combination of mechanical properties with higher corrosion resistance is required. Their excellent properties are due to the biphasic microstructure, however, when thermal cycles are applied can be highly affected by the formation of hazardous intermetallic phases decreasing their performance. Welding as beneficial can be detriment for joining stainless steels; moreover, some welding processes are limited for narrow thicknesses or the electrode can promote intermetallic phases. Laser welding is an advanced joining process that is currently replacing traditional fusion processes, besides it can be employed to join thin plates. The aim of this study is to observe the plates of 2304 DSS plastically deformed joined by pulsed laser welding varying the peak power in order to observe the microstructural modifications and penetration of the joint. The experiments were performed by fixing some laser welding parameters in order to observe only the influence of the peak power. Microstructural observations by means of optical and electron microscope were performed, within EDS analysis to identify possible intermetallic phases. Microhardness evaluation was performed observing variations mainly at the surface.
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