Additive manufacturing of metallic components – Process, structure and properties

Inconel 718 produced by selective laser melting (SLM) has been characterized with focus on the microstructure, the dependence of sample orientation on the mechanical properties and the effects of post heat treatments. The as-manufactured IN718 has a very fine cellular-dendritic structure with fine Laves phases precipitating in the interdendritic region, and electron backscatter diffraction (EBSD) analysis shows that both the vertically and horizontally built samples have relatively weak texture. The vertically built samples show lower tensile strength but higher ductility than the horizontally built samples, and the mechanism is shown to be partly due to the crystallographic feature but more importantly due to the different amount of residual stress and dislocations accumulated in these two kinds of samples. Applying heat treatments can significantly increase the strength while decrease the ductility correspondingly, and difference in yield strength between the vertically and horizontally built samples decreases with increasing the heat treatment temperatures, mainly due to the removal of residual stress and dislocations.

Microstructure and mechanical properties of Inconel 718 produced by selective laser melting: Sample orientation dependence and effects of post heat treatments

https://nottingham-repository.worktribe.com/preview/805505/Final%20fatigue%20Manuscript.pdf

Improving the fatigue behaviour of a selectively laser melted aluminium alloy: Influence of heat treatment and surface quality

https://research.birmingham.ac.uk/portal/files/39642722/Wang_et_al_Microstructure_and_yield_strength_Acta_Materialia_2017.pdf

Microstructure and yield strength of SLM-fabricated CM247LC Ni-Superalloy

Alloys-by-design: Application to new superalloys for additive manufacturing

https://www.repository.cam.ac.uk/bitstream/1810/254150/1/V.D.%20Divya%20et%20al%202016%20Materials%20Characterization.pdf

Microstructure of selective laser melted CM247LC nickel-based superalloy and its evolution through heat treatment

Gamma-gamma prime-gamma double prime dual-superlattice superalloys

An isothermal section of the Fe-Mo-Ti ternary system at 1000 °C has been constructed using data acquired from a series of seven alloys. The limit of solubility of Fe in the continuous A2 phase field between Ti and Mo has been determined, as have the extents to which Mo may be accommodated in the B2 TiFe phase, and Ti in the D8 5 Fe 7 Mo 6 phase. The B2, D8 5 and C14 Fe 2 (Ti, Mo) intermetallics were found to have limited tolerance for non-stoichiometric compositions. The positions of the A2 + B2 + C14 and A2 + C14 + D8 5 three-phase fields were determined, along with the extents of the A2 + B2, A2 + D8 5 , A2 + C14, C14 + B2 and C14 + D8 5 two-phase fields. No ternary phases were observed in any of the alloys studied.

/pdf/phase-equilibria-in-the-fe-mo-ti-ternary-system-at-1000-c-1jpa3jtptw.pdf

Omdm Messé

Papers

Microstructure of selective laser melted CM247LC nickel-based superalloy and its evolution through heat treatment

Gamma-gamma prime-gamma double prime dual-superlattice superalloys

Phase equilibria in the Fe-Mo-Ti ternary system at 1000 °C