Scale levels of quasi-static and dynamic fracture behavior of Ti-6Al-4V parts built by various additive manufacturing methods

被引：13

作者：

Panin, Alexey V. ^{[1
,2
]}

Kazachenok, Marina S. ^{[1
]}

Panin, Sergey V. ^{[1
,2
]}

Berto, Filippo ^{[3
]}

机构：

[1] RAS, Inst Strength Phys & Mat Sci SB, Tomsk, Russia

[2] Natl Res Tomsk Polytech Univ, Tomsk, Russia

[3] Norwegian Univ Sci & Technol NTNU, Dept Mech & Ind Engn, Trondheim, Norway

来源：

THEORETICAL AND APPLIED FRACTURE MECHANICS | 2020年 / 110卷

基金：

俄罗斯科学基金会;

关键词：

Additive manufacturing; Titanium; Microstructure; Fracture; Tension; Impact bending; MECHANICAL-PROPERTIES; IMPACT TOUGHNESS; MICROSTRUCTURE; ALLOY; DEFORMATION; TITANIUM;

D O I：

10.1016/j.tafmec.2020.102781

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Comparison of the microstructure and the phase composition of the Ti-6Al-4V alloy parts built by various additive manufacturing technologies was carried out by optical and transmission scanning electron microscopy, as well as X-ray diffraction analysis. It was shown that the martensitic alpha' phase, formed due to the melt pool fast cooling rate, determined the accommodation mechanisms of shear deformation of the as-built Ti-6Al-4V AM fabricated samples under uniaxial quasi-static tension and impact bending (and, accordingly, their mechanical properties). The effect of microstructure on impact toughness, ultimate impact strength, as well as the crack initiation and propagation energy was investigated by the impact bending tests with recording impact load diagram (force-displacement graph). It was concluded that impact toughness of the Ti-6Al-4V samples built by wire-feed electron beam additive manufacturing was significantly higher than that of ones manufactured by selective laser melting and electron beam melting of a powder. Matching the mechanical properties and SEM micrographs of the fracture surfaces of the as-built Ti-6Al-4V AM fabricated samples enabled to reveal the crack initiation and propagation mechanisms during their quasi-static and dynamic loading. Discussion of the results was carried out using the concept of scale levels of plastic deformation.

引用

页数：10

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