Metallurgy of additive manufacturing: Examples from electron beam melting

By L. Murr. 2015

243 citations recorded by the source corpus.

Abstract The metallurgy of selected metal and alloy components fabricated by additive metallurgy using electron beam melting (EBM) is presented for a range of examples including Ti-6Al-4V, Co-Cr-Mo super alloy, Ni-base super alloy systems (Inconel 625, 718 and Rene 142), Nb and Fe. Precursor and pre-alloyed powders are preheated and selectively melted using a range of EBM process parameters including beam scan strategies, beam current variations, and cooling rate features. Microstructures and residual mechanical properties are discussed for selected systems in contrast to more conventional wrought and cast products. Novel features of EBM fabrication include columnar microstructural architectures which result by layer-by-layer melt-solidification phenomena.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/8a42c731d240218a9927b8e548756e45e53a2cad

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Citations in the corpus

Effect of building direction on the microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy additively manufactured by electron beam melting (2017, methodology): “To overome these disadvantages, a powder-bed additive manufacturing AM) process [6,7] has emerged as a promising fabrication process”
Residual stress and texture control in Ti-6Al-4V wire + arc additively manufactured intersections by stress relief and rolling (2018, background): “The temperature range of heat treatments for microstructural improvements [9], [10] or even hot-isostatic pressing [11], [12] typically exceed stress relieving temperatures and act therefore stress relieving by default.”
Metal Binder Jetting Additive Manufacturing: A Literature Review (2020, background): “Powder bed fusion [18, 19, 21-23, 32-44]  High accuracy  Fully dense parts  Good mechanical properties  High cost (both machine depreciation and operation)  Significant residual stress  Support material required”
Viewpoint: metallurgical aspects of powder bed metal additive manufacturing (2016, background): “Elongated grains are often observed in as-built microstructures [66, 67], and the residual stresses could promote the formation of equiaxed grains during heat treatment-induced recrystallization reactions.”
Additive manufacturing of metallic components by selective electron beam melting — a review (2016, background): “Thus, SEBM shows phenomena usually observed for welding processes.(18) Generally, the process parameters typically used during SEBM lead to a heat conduction driven welding process with only a small tendency to deep welding.”