Formation of the Ni3Nb δ-Phase in Stress-Relieved Inconel 625 Produced via Laser Powder-Bed Fusion Additive Manufacturing

被引：164

作者：

Lass, Eric A. ^{[1
]}

Stoudt, Mark R. ^{[1
]}

Williams, Maureen E. ^{[1
]}

Katz, Michael B. ^{[1
]}

Levine, Lyle E. ^{[1
]}

Phan, Thien Q. ^{[2
]}

Gnaeupel-Herold, Thomas H. ^{[3
]}

Ng, Daniel S. ^{[1
]}

机构：

[1] NIST, Mat Sci & Engn Div, Mat Measurement Lab, Gaithersburg, MD 20899 USA

[2] NIST, Intelligent Syst Div, Engn Lab, Gaithersburg, MD 20899 USA

[3] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2017年 / 48A卷 / 11期

关键词：

MECHANICAL-PROPERTIES; STAINLESS-STEEL; HEAT-TREATMENT; TEMPERATURE; MICROSTRUCTURE; BEHAVIOR; WELD;

D O I：

10.1007/s11661-017-4304-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructural evolution of laser powder-bed additively manufactured Inconel 625 during a post-build stress-relief anneal of 1 hour at 1143 K (870 degrees C) is investigated. It is found that this industry-recommended heat treatment promotes the formation of a significant fraction of the orthorhombic D0(a) Ni3Nb delta-phase. This phase is known to have a deleterious influence on fracture toughness, ductility, and other mechanical properties in conventional, wrought Inconel 625; and is generally considered detrimental to materials' performance in service. The delta-phase platelets are found to precipitate within the inter-dendritic regions of the as-built solidification microstructure. These regions are enriched in solute elements, particularly Nb and Mo, due to the micro-segregation that occurs during solidification. The precipitation of delta-phase at 1073 K (800 degrees C) is found to require up to 4 hours. This indicates a potential alternative stress-relief processing window that mitigates delta-phase formation in this alloy. Ultimately, a homogenization heat treatment is recommended for additively manufactured Inconel 625 because the increased susceptibility to delta-phase precipitation increases the possibility for significant degradation of materials' properties in service. (C) The Minerals, Metals & Materials Society and ASM International (outside the USA) 2017

引用

页码：5547 / 5558

页数：12

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