Microstructure of the Nickel-Base Superalloy CMSX-4 Fabricated by Selective Electron Beam Melting

By M. Ramsperger, R. Singer, Carolin Körner. Metallurgical and Materials Transactions. A, 2016

202 citations recorded by the source corpus.

Powder bed-based additive manufacturing (AM) processes are characterized by very high-temperature gradients and solidification rates. These conditions lead to microstructures orders of magnitude smaller than in conventional casting processes. Especially in the field of high performance alloys, like nickel-base superalloys, this opens new opportunities for homogenization and alloy development. Nevertheless, the high susceptibility to cracking of precipitation-hardenable superalloys is a challenge for AM. In this study, electron beam-based AM is used to fabricate samples from gas-atomized pre-alloyed CMSX-4 powder. The influence of the processing strategy on crack formation is investigated. The samples are characterized by optical and SEM microscopy and analyzed by microprobe analysis. Differential scanning calorimetry is used to demonstrate the effect of the fine microstructure on characteristic temperatures. In addition, in situ heat treatment effects are investigated.

Subfields: Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/778c7461a10ea3809ccc39de4f89e45437470245

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Citations in the corpus

• Additive manufacturing of Ni-based superalloys: The outstanding issues (2016, unknown): “Generally, insufficient melting resulting from low energy input or poor powder spreading can lead to the formation of large internal voids (42, 43), following a reducing”
• Effect of laser rescanning on the grain microstructure of a selective laser melted Al-Mg-Zr alloy (2018, background): “[3] Electron beam melting (EBM) of Ni-based superalloys has resulted in in-situ precipitation [4] but superalloys fabricated with SLM have minimal to no precipitation.”
• Overview on Additive Manufacturing Technologies (2017, background): “Other materials evaluated for the EBM process feasibility (apart from gamma-TiAl alloys described earler) are nickel superalloys, such as Inconel 718 and Inconel 625, Rene142, and CMSX4 [129, 141-144]; Cobalt superalloy [129], copper [129], [141], [145], stainless steels [111], [146], and CoCrMo [11”
• Additive manufacturing of metallic components – Process, structure and properties (2018, background): “CMSX-4 AD Cuboidal c0 72 ± 5 vol% with c [336]”
• Hot cracking mechanism affecting a non-weldable Ni-based superalloy produced by selective electron Beam Melting (2018, background): “Such superalloys include Inconel 738 [19,20], CMSX-4 [21,22], Ren" e 142 [23] or CM247LC [24], which have hence recently attracted attention for usage in additive manufacturing processes.”
• Atomic-scale grain boundary engineering to overcome hot-cracking in additively-manufactured superalloys (2019, unknown): “as IN738 [3–5], CMSX-4 [6], CM247LC [7] among others [8,9].”