Effects of W Addition on Microstructure and 650 °C Mechanical Properties of Ti-Al-Sn-Zr-Mo-Nb-W-Si Alloy

Abstract:

The influence of W addition on microstructure and mechanical properties of Ti-Al-Sn-Zr-Mo-Nb-W-Si high temperature titanium alloys are investigated by optical microscope (OM), scanning electron microscopy (SEM), electron probe microanalysis (EPMA), tensile tests and large stress endurance tests at 650 °C. The results show that W is mainly solubilized in β phase. Microstructure observations indicate an obvious reduction in the size of transformed β structure (β_t), primary α phase (α_p) and the thickness of secondary lamellar α phase (α_L), with the increase of W content. It is also observed that adding more W could improve the elongation, tensile strength and large stress rupture properties at 650 °C. However, combined with previous research, adding more β stabilizing elements could refine the size of each phase, which will be detrimental to the high temperature yield strength of the alloy. Therefore, in order to reasonably utilize the strengthening effect of W and make the alloy have high yield strength and tensile strength at 650 °C, its content should be controlled between 1 ~ 2 wt%

• Periodical: Key Engineering Materials (Volume 904)
• Pages: 53-58
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.904.53
• Online since: November 2021
• Authors: Wen Jing Zhang*, Hao Feng Xie, Li Jun Peng, Zhen Yang, Guo Jie Huang, Xue Feng
• Keywords: 650°C, Large Stress Endurance Performance, Microstructure, Tensile Properties, W Addition

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