The high temperature creep and fracture behavior of Inconel 718 produced by additive manufacturing

被引：8
作者：
Oros, Theophil J. [1 ]
Son, Kwangtae [1 ,2 ]
Hodge, Andrea M. [1 ]
Kassner, Michael E. [1 ]
机构：
[1] Univ Southern Calif, Mork Family Dept Chem Engn & Mat Sci, 3710 McClintock Ave, Los Angeles, CA 90089 USA
[2] Oregon State Univ, Sch Mech Ind & Mfg Engn, 2000 SW Monroe Ave, Corvallis, OR 97331 USA
来源：
SCRIPTA MATERIALIA | 2024年 / 251卷
基金：
美国国家科学基金会;
关键词：
Creep; Fracture; Impurity embrittlement; Superalloy; Additive manufacturing; NICKEL; MECHANISM; SULFUR;
D O I：
10.1016/j.scriptamat.2024.116208
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High-temperature creep tests of additively manufactured (AM) and wrought nickel alloy 718 (IN718) were conducted at 650 degrees C and 704 degrees C at stresses ranging from 316 to 819 MPa. The AM alloy had a greater creep strength than the wrought alloy at nearly all testing conditions due to increased volume fractions of gamma" in the matrix and carbides at grain boundaries; however, the creep rupture ductility of the AM material was significantly reduced at all testing conditions. Secondary ion mass spectrometry (SIMS) revealed that sulfur segregation, resulting from a lack of Mg in the AM alloy, is the most plausible explanation for the observed ductility loss in AM IN718. Overall, this work focuses on understanding and defining the mechanism of embrittlement in AM IN718.
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页数：7
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