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Analytical Electron-Microscopy Evaluation of Laser-Welded 308 Stainless Steel

机译：激光焊接308不锈钢的分析电子显微镜评价

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Analytical electron microscopy (AEM) was used to characterize the structure of laser welded 308 stainless steel. Due to the small amounts and fine scale of the minor phases found in the laser welded material, AEM is unique in its ability to determine compositions accurately. The laser welded microstructures were different from those produced by more conventional techniques in that the amount of delta ferrite found in an austenite matrix was much lower (< 1% vs 10%). Additionally, a uniform distribution of amorphous Mn-Si rich precipitates was found. Compositions were determined as a function of both welding speed and post-weld annealing. Results on specimens annealed after welding at 750 and 900 exp 0 C indicated the equilibrium structure consisted of austenite plus delta ferrite. After annealing at higher temperatures (1060 exp 0 C), both the ferrite and the Mn-Si particles dissolved, and instead a Cr-Mn rich precipitate formed in small quantities (< 10%). This Cr-Mn precipitate was found to be fcc, with a sub 0 = 0.82 nm. (ERA citation 06:020453)

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