%0 Journal Article
%T Portevin-Le Chatelier Effect in Additively Manufactured and As-Cast Inconel 939 Nickel-Based Superalloy
%A Moshe Nahmany
%A Daniel Moreno
%A Yohanan Nahmana
%A Mathan Zakai
%A Ariel Yehuda Cohen
%A Moshe Shapira
%A Roni Shneck
%J Journal of Minerals and Materials Characterization and Engineering
%P 299-315
%@ 2327-4085
%D 2024
%I Scientific Research Publishing
%R 10.4236/jmmce.2024.126019
%X Nickel-based superalloys, well-established in aeronautics, have recently gained significant traction in additive manufacturing. Inconel 939 is one of the alloys increasingly playing a vital role in this field. This paper examines the development of the Portevin-Le Chatelier (PLC) effect in additively manufactured Inconel 939 in comparison with cast Inconel 939. A detailed analysis of tensile test characteristics was conducted, complemented by a high-resolution scanning electron microscopy (HR-SEM) investigation. The PLC region exhibited several properties during tensile testing, such as stress-strain behavior, cycle scale, and overall stress increase. The HR-SEM analysis of Gamma prime (<i>&#947;</i>') precipitates revealed distinct morphologies, which are suggested to be linked to the features of the PLC region. Samples with a high amount of <i>&#947;</i>' precipitates showed a less pronounced PLC region, while those with fewer <i>&#947;</i>' precipitates displayed a more distinct PLC effect. A mechanism for the cyclic drop-and-rise stress behavior, based on the work of Varvenne and La-Rose, was proposed, possibly induced by the varying morphologies of <i>&#947;</i>' precipitates in the IN939 alloy. Further study is needed to deepen the understanding of the relationship between the <i>&#947;</i>' micro-(nano) structure and the PLC phenomenon.
%K Inconel 939
%K Gamma Prime
%K <i>&#947
%K </i>'
%K Portevin-Le Chatelier (PLC)
%K Dynamic Strain Aging
%K DSA
%K Mechanical Properties
%K Additive Manufacturing
%K Superalloys
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=137163