Surface globularization generated by standard PBF-EB Ti-6Al-4V processing achieves an improvement in fatigue performance

被引：4

作者：

Derimow, Nicholas ^{[1
]}

Hanson, Keenan ^{[2
]}

Moser, Newell ^{[1
]}

Kafka, Orion L. ^{[1
]}

Benzing, Jake T. ^{[1
]}

Hrabe, Nikolas ^{[1
]}

机构：

[1] NIST, Appl Chem & Mat Div, 325 Broadway, Boulder, CO 80305 USA

[2] Stryker, Mahwah, NJ 07430 USA

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2022年 / 159卷

关键词：

Additive manufacturing; Ti-6Al-4V; Powder recovery; Recrystallization; Fatigue; BEAM MELTING EBM; ELECTRON; DEFECTS; BEHAVIOR; ROUGHNESS; STRENGTH;

D O I：

10.1016/j.ijfatigue.2022.106810

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Standard electron beam powder-bed fusion Ti-6Al-4V powder recovery and hot-isostatic pressing has been found to result in a surface layer microstructure change to globular alpha/beta. Thickness control of this surface layer up to 15 mu m was demonstrated by varying powder recovery blasting working distance and duration. This surface globular layer was found to improve high-cycle rotating bending fatigue strength at 10(7) cycles by 60 MPa for specimens with smooth surfaces. The same trend was not observed for specimens with as-built surface roughness because globularization did not occur at dominant fatigue crack initiation sites; the roots of deep surface crevices.

引用

页数：13

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