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Effect of Process Parameters on Microstructure and Dynamic Compressive Property of Ti-6Al-4V Plates Fabricated via Friction Stir Welding

  • Bao Jiawei
  • Yang Ting
  • Yang SuyuanEmail author
Article

Abstract

The microstructure and mechanical properties of Ti-6Al-4V plates (thickness: 5 mm) welded via friction stir welding (rotation speed: 150-300 rpm, welding speed: 70-100 mm/min) were investigated. The microstructural investigation revealed that the nugget obtained at 150 rpm and 70 mm/min was composed of a mixed structure, whereas the other weld joints were composed of a fully lamellar structure. Transmission electron microscopy analysis revealed that fine recrystallized α-grains and dislocations occurred in the lamellar structure. The tensile tests showed that the tensile strength of all joints reached 96% of the tensile strength characterizing the base material. Moreover, the failure strain of each joint during tensile testing was > 13%. The weld joints with fully lamellar nuggets exhibited better dynamic compressive properties than the joints with mixed-structure nuggets. The results demonstrated that the recrystallized α-grains and dislocations are beneficial for enhancing the dynamic mechanical properties. The optimum dynamic mechanical response was obtained when a rotation speed and welding speed of 300 rpm and 100 mm/min, respectively, were employed as the welding parameters.

Keywords

dynamic compressive property friction stir welding microstructure Ti-6Al-4V 

Notes

Acknowledgments

This study is financially supported by “The National Natural Science Foundation of China (No. 51571031).” We thank Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

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© ASM International 2020

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringBeijing Institute of TechnologyBeijingChina
  2. 2.National Key Laboratory of Science and Technology on Materials under Shock and ImpactBeijingChina

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