Microstructures and mechanical behavior of beta-type Ti-25V-15Cr-0.2Si titanium alloy coating by laser cladding

Document Type

Journal Article

Publication Title

Materials Science and Engineering A

ISSN

09215093

Volume

796

Publisher

Elsevier

School

School of Engineering

RAS ID

32042

Funders

National Key Research and Development Program of China Natural Science Basic Research Plan in Shaanxi Province of China Fundamental Research Funds for the Central Universities

Comments

Zhang, F., Qiu, Y., Hu, T., Clare, A. T., Li, Y., & Zhang, L. C. (2020). Microstructures and mechanical behavior of beta-type Ti-25V-15Cr-0.2 Si titanium alloy coating by laser cladding. Materials Science and Engineering: A, 796, article 140063. https://doi.org/10.1016/j.msea.2020.140063

Abstract

© 2020 Preparing a flame-resistant coating with high adhesion to the titanium substrate is a feasible method to prevent “titanium fire”. In this work, Ti-25V-15Cr-0.2Si, which is a beta stabilized titanium alloy with excellent flame-resistant properties, was fabricated on a Ti-6Al-4V substrate by laser cladding with aim to improve the flame resistance of the Ti-6Al-4V substrate. The microstructure, mechanical properties and strengthening mechanisms of the laser cladded samples were studied. An excellent metallurgical bond is formed between the substrate and the cladded layers and a reasonable transition of composition and microhardness from the substrate to the Ti-25V-15Cr-0.2Si cladded layers is obtained. An effective relationship between dilution ratio and composition was established to predict the composition evolution of transition zone in the cladded layers. Microstructural characterization confirmed a direct transformation from α+β bi-phase in Ti-6Al-4V substrate to single β phase in Ti-25V-15Cr-0.2Si laser cladded zone throughout the cladding interface. The room-temperature tensile testing along both parallel and vertical to cladding interfaces showed that the cladded samples exhibit tensile strength exceeding 900 MPa and elongation of > 9% (reaching 90% and 70%, respectively, the corresponding ones of wrought Ti-6Al-4V substrate), indicating the very good mechanical performance of the laser cladded samples.

DOI

10.1016/j.msea.2020.140063

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