Portevin-Le Chatelier Effect in Additively Manufactured and As-Cast Inconel 939 Nickel-Based Superalloy  

作　　者：Moshe Nahmany Daniel Moreno Yohanan Nahmana Mathan Zakai Ariel Yehuda Cohen Moshe Shapira Roni Shneck Moshe Nahmany;Daniel Moreno;Yohanan Nahmana;Mathan Zakai;Ariel Yehuda Cohen;Moshe Shapira;Roni Shneck(Bet Shemesh Engines Ltd., FAA&EASA, Bet Shemesh, Israel;Nuclear Research Center-Negev, Beer Sheva, Israel;Department of Materials Science and Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel)

机构地区：[1]Bet Shemesh Engines Ltd., FAA&EASA, Bet Shemesh, Israel [2]Nuclear Research Center-Negev, Beer Sheva, Israel [3]Department of Materials Science and Engineering, Ben-Gurion University of the Negev, Beer Sheva, Israel

出　　处：《Journal of Minerals and Materials Characterization and Engineering》2024年第6期299-315,共17页矿物质和材料特性和工程（英文）

摘　　要：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 (γ') precipitates revealed distinct morphologies, which are suggested to be linked to the features of the PLC region. Samples with a high amount of γ' precipitates showed a less pronounced PLC region, while those with fewer γ' 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 γ' precipitates in the IN939 alloy. Further study is needed to deepen the understanding of the relationship between the γ' micro-(nano) structure and the PLC phenomenon.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 (γ') precipitates revealed distinct morphologies, which are suggested to be linked to the features of the PLC region. Samples with a high amount of γ' precipitates showed a less pronounced PLC region, while those with fewer γ' 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 γ' precipitates in the IN939 alloy. Further study is needed to deepen the understanding of the relationship between the γ' micro-(nano) structure and the PLC phenomenon.

关 键 词：Inconel 939 Gamma Prime γ' Portevin-Le Chatelier (PLC) Dynamic Strain Aging DSA Mechanical Properties Additive Manufacturing SUPERALLOYS 

分 类 号：TG1[金属学及工艺—金属学]