Additive manufacturing: A review on 3 D printing of metals and study of residual stress, buckling load capacity of strut members

Additive manufacturing is emerging technology in the growing industry for the production of parts and it can be used for repairing of parts also. Additive manufacturing is the best suitable name for 3 D printing as it prints the part layer by layer so additive. In additive manufacturing 3 D printing of plastics and metals can be done enormously with precise surface finish and feature quality as required. Focusing more on metal 3 D printing it is done with direct metal sintering, direct energy deposition and Metal binder jetting. The metal sintering process use powder bed with powder metal and laser selectively melts a flattened bed of powder which is done with roller with successive rolling of new layer on previous into desired shape before a new layer is pushed on top of the previous layer and successive scanning and lowering of powder bed until the CAD model is done. So melt back happening melting previous layer again due to solidifying the new layer on the earlier layer. This causes residual stresses because of the unique thermal cycle. This residual stress can lead to the failure of the printed part. This can be overcome by pre-heating of powder bed which will reduce such kind of problem. The printed part can be scanned for with Scanner dimensional accuracy. Much of the metal contracts after melting so this scanning will help for adjusting the size and dimensioning of the CAD model. The surface texture is also analyzed with the help of microscopes for doing comparison with conventional subtractive methods. (C) 2019 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Mechanical and Energy Technologies.