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Microstructure and Mechanical Properties of Welded Additively Manufactured Stainless Steels SS316L
T. Pasang,A. Kirchner,U. Jehring,M. Aziziderouei,Y. Tao,C. ‑P. Jiang,J. C. Wang,I. S. Aisyah 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5
Microstructure and mechanical properties of additively manufactured SS316L has been investigated. The samples producedby selective electron beam melting machine were then subjected to gas tungsten arc welding. Various examinations wereperformed including metallography and microscopy, hardness testing, and tensile testing coupled with digital image correlationsoftware. Strain distribution was clearly evident on the samples during tensile testing with necking taking place atthe heat affected zone on both sides of the weldments. From tensile testing, it was clear that the ductility and strengths ofthe samples were equal to those of conventionally produced samples such as rolled sheet. Hardness testing indicated theuniform distribution across the base metal and the weldments. Scanning electron microscopy identified the presence of Crand Mo-rich precipitates on the grain boundaries, while the fracture surface was entirely covered with dimples (microvoidcoalescence) indicating a ductile fracture mode.