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Metallurgical and mechanical study of AISI 316L and AISI 4340 dissimilar electron beam welding

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Document pages: 11 pages

Abstract: Heterogeneous electron beam welding of 316L austenitic stainless steel and AISI 4340 low alloy high strength steel was studied. The effects of beam on Weld Geometry, optical and scanning electron microscopy, X-ray diffraction of weld microstructure and heat affected zone were studied. The results show that the depth and width of weld increase with the increase of beam current. The optimum beam current is 2.8   Ma, showing the full penetration of the minimum width. By measuring the secondary dendrite arm spacing, the optimal cooling rate of the sample is calculated. The results show that high cooling rate leads to austenite microstructure. In addition, the metallographic results show that there are columnar and equiaxed austenite structures in the weld area. Comparison of HAZ withs depicts the wider HAZ in the 316L side. The tensile tests results showed that the optimum sample fractured from base metal in AISI 316L side with the UTS values is much greater than the other samples. Moreover, the fractography study presents the weld cross sections with dimples resembling ductile fracture. The hardness results showed that the increase of the beam current led to the formation of a wide softening zone as HAZ in AISI 4340 side.

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