Superior tensile properties of Hastelloy X enabled by additive manufacturing

被引：42

作者：

Ghiaasiaan, Reza ^{[1
,2
]}

Muhammad, Muztahid ^{[1
,2
]}

Gradl, Paul R. ^{[3
]}

Shao, Shuai ^{[1
,2
]}

Shamsaei, Nima ^{[1
,2
]}

机构：

[1] Auburn Univ, Natl Ctr Addit Mfg Excellence NCAME, Auburn, AL 36849 USA

[2] Auburn Univ, Dept Mech Engn, Auburn, AL 36849 USA

[3] NASA, Marshall Space Flight Ctr, Prop Dept, Huntsville, AL USA

来源：

MATERIALS RESEARCH LETTERS | 2021年 / 9卷 / 07期

基金：

美国国家航空航天局;

关键词：

Additive manufacturing; Ni-based superalloy; microstructure; tensile properties; deformation mechanism;

D O I：

10.1080/21663831.2021.1911870

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study reports the superior tensile properties of laser powder bed fused (L-PBF) Hastelloy X compared to wrought, exhibiting enhanced yield strength and improved ductility. By analyzing the tensile response of a variety of microstructures ranging from fully dendritic to fully solutionized, the as-solidified fine inter-dendritic region network was determined to be responsible for this superiority. Characterized by high chemical gradients, the inter-dendritic regions limited motion of dislocations, blocked the formation of long deformation bands, and promoted the uniform distribution of plastic strain. Further, a deformation mechanism not well known for Hastelloy X, i.e. deformation twinning, was observed and analyzed. IMPACT STATEMENT Superior tensile properties of as-fabricated, additively manufactured Hastelloy X relative to the wrought counterpart is reported. Room temperature deformation twinning is also observed in both as-fabricated and heat-treated conditions.

引用

页码：308 / 314

页数：7

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