研究目的
Investigating the effects of Nd: YAG pulsed laser dissimilar welding of UNS S32750 super duplex stainless steel with 316L austenitic stainless steel under different heat inputs on the microstructure and mechanical properties.
研究成果
The study demonstrated that Nd: YAG pulsed laser welding between UNS S32750 duplex steel and AISI 316L austenitic stainless steel resulted in a balanced microstructure with approximately 50%–50% volumetric fractions of austenite and ferrite in the fusion zone. The hardness of the fusion zone was higher than that of the base metals. Changes in the heat input did not significantly affect the ferrite/austenite phase balance and the microhardness of the fusion zone. The tensile tests showed fracture occurred outside the fusion zone, always in the AISI 316L austenitic stainless steel base metal.
研究不足
The study is limited to the effects of heat input on the microstructure and mechanical properties of the welded joints. The research does not explore the long-term corrosion resistance or the effects of post-weld heat treatments.
1：Experimental Design and Method Selection:
The study involved Nd: YAG pulsed laser welding of dissimilar materials (UNS S32750 SDSS and 316L ASS) with varying heat inputs (45, 90, and 120 J/mm). The welding was conducted in an argon atmosphere.
2：Sample Selection and Data Sources:
Base metals were shaped to sizes of
3：5 mm × 50 mm × 120 mm. The chemical composition of the base metals was analyzed. List of Experimental Equipment and Materials:
A pulsed Nd: YAG laser machine (model UW-150A) was used for welding. SEM (Carl Zeiss EVO LS15) and free image software (Image J) were used for microstructure analysis. Vickers microhardness tests were performed.
4：Experimental Procedures and Operational Workflow:
Samples were welded with single pass-double size with a pulsed Nd: YAG laser machine. The laser beam was focused on the surface of the base metal, and the welding speed was fixed at
5：0 mm/s. The frequencies of the pulses used were 5, 0, and 0 Hz. Data Analysis Methods:
The austenite/ferrite ratio in the fusion zone was calculated using SEM images and Image J software. Microhardness tests were performed, and tensile tests were conducted following ASTM E8M-04 Standard.
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