Study on TC4 Titanium Alloy by Laser Oxygen-Diffused Hardening Process under Different Gas Atmosphere

Chang Jun Chen; Min Zhang; Qing Ming Chang

doi:10.4028/www.scientific.net/AMR.337.33

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 337Study on TC4 Titanium Alloy by Laser...

Study on TC4 Titanium Alloy by Laser Oxygen-Diffused Hardening Process under Different Gas Atmosphere

Abstract:

Surface oxygen diffusion hardening treatments of TC4 titanium alloy in Ar+O₂, O₂ and ambient atmosphere were performed by scanning with a pulsed Nd: YAG laser. By using different gas atmosphere with Ar+O₂, O₂ and ambient atmosphere, the structure and the hardness behavior of the laser oxygen hardening layers can be controlled in a wide range. Optical microscope (OM), scanning electron microscopy (SEM), energy dispersive analysis system of X-ray (EDAX) was used to reveal the microstructure and to identify the chemical composition. A Vickers microhardness tester was employed to measure the hardness distribution across both the substrate and the hardening layer. It is shown that smooth, deep and crack-free harden layers of a surface hardness ranging from 810-673Hv can be obtained under ambient atmosphere and Ar+O₂ atmosphere. Cracks are observed in the sample processed under pure oxygen atmosphere. Dilution of oxygen gas with argon or nitrogen (ambient atmosphere) leads to a crack-free harden layer at the expense of a reduction in surface hardness.

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Periodical:

Advanced Materials Research (Volume 337)

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33-36

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.337.33

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Online since:

September 2011

Authors:

Chang Jun Chen, Min Zhang, Qing Ming Chang

Keywords:

Hardness, Laser Oxygen Diffusion Hardening, Microstructure, TC4 Titanium Alloy

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