Surface modification of selective laser melted Ti-6Al-4V by ultrasonic impact treatment and electron beam irradiation

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019 Pub Date : 2019-11-19 DOI:10.1063/1.5132203

E. Sinyakova, S. Panin, A. Teresov

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Abstract

Changes of the surface roughness, microstructure, phase composition and microhardness of selective laser melted Ti-6Al-4V samples during electron beam irradiation and ultrasonic impact treatment were investigated by contact profilometry, optical microscopy, X-ray analysis, and hardness measurement. It was shown that electron beam irradiation and ultrasonic impact treatment of the selective laser melted Ti-6Al-4V samples smooth their surface. Significant refinement of the microstructure and TiO nanoparticles formation under ultrasonic impact treatment occur causing the increase in surface microhardness. Electron beam irradiation leads to a more significant increase in both the microhardness and thickness of the melted surface layer due to martensitic transformation.Changes of the surface roughness, microstructure, phase composition and microhardness of selective laser melted Ti-6Al-4V samples during electron beam irradiation and ultrasonic impact treatment were investigated by contact profilometry, optical microscopy, X-ray analysis, and hardness measurement. It was shown that electron beam irradiation and ultrasonic impact treatment of the selective laser melted Ti-6Al-4V samples smooth their surface. Significant refinement of the microstructure and TiO nanoparticles formation under ultrasonic impact treatment occur causing the increase in surface microhardness. Electron beam irradiation leads to a more significant increase in both the microhardness and thickness of the melted surface layer due to martensitic transformation.

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超声冲击处理和电子束辐照对选择性激光熔化Ti-6Al-4V的表面改性

采用接触轮廓术、光学显微镜、x射线分析和硬度测量等方法，研究了选择性激光熔化Ti-6Al-4V试样在电子束辐照和超声冲击处理过程中表面粗糙度、显微组织、相组成和显微硬度的变化。结果表明，电子束辐照和超声冲击处理可使Ti-6Al-4V试样表面光滑。在超声冲击处理下，微观结构明显细化，形成了TiO纳米颗粒，导致表面显微硬度增加。由于马氏体相变，电子束辐照导致熔体表层显微硬度和厚度的增加更为显著。采用接触轮廓术、光学显微镜、x射线分析和硬度测量等方法，研究了选择性激光熔化Ti-6Al-4V试样在电子束辐照和超声冲击处理过程中表面粗糙度、显微组织、相组成和显微硬度的变化。结果表明，电子束辐照和超声冲击处理可使Ti-6Al-4V试样表面光滑。在超声冲击处理下，微观结构明显细化，形成了TiO纳米颗粒，导致表面显微硬度增加。由于马氏体相变，电子束辐照导致熔体表层显微硬度和厚度的增加更为显著。

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PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019

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