In situ tailoring microstructure in laser solid formed titanium alloy for superior fatigue crack growth resistance

For damage tolerance (DT) titanium alloy, the fatigue crack growth resistance (FCGR) is a critical properties requirement for engineering applications. However, the Ti-6Al-4V-DT parts fabricated by laser solid forming (LSF) suffer from low FCGR, because of predominant basket-wave microstructure. Her...

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Bibliographic Details
Published inScripta materialia Vol. 174; pp. 53 - 57
Main Authors Zhao, Zhuang, Chen, Jing, Tan, Hua, Tang, Jingang, Lin, Xin
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2020
Subjects
Colony microstructure
Fatigue crack growth resistance
Laser solid forming
Titanium alloy
Titanium alloy
Colony microstructure
Fatigue crack growth resistance
Laser solid forming
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Summary:For damage tolerance (DT) titanium alloy, the fatigue crack growth resistance (FCGR) is a critical properties requirement for engineering applications. However, the Ti-6Al-4V-DT parts fabricated by laser solid forming (LSF) suffer from low FCGR, because of predominant basket-wave microstructure. Here, we have explored a novel LSF fabrication design to produce full colony microstructure, via in-situ controlled growth. The creation of such microstructures leads to superior FCGR, which markedly exceed conventional additive manufactured and mill-annealed samples. The present works provide a significant guidance for LSF-fabricated titanium alloy with high DT properties. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.08.028