Residual Stress, Defects and Grain Morphology of Ti-6Al-4V Alloy Produced by Ultrasonic Impact Treatment Assisted Selective Laser MeltingReportar como inadecuado


Residual Stress, Defects and Grain Morphology of Ti-6Al-4V Alloy Produced by Ultrasonic Impact Treatment Assisted Selective Laser Melting


Residual Stress, Defects and Grain Morphology of Ti-6Al-4V Alloy Produced by Ultrasonic Impact Treatment Assisted Selective Laser Melting - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

2

Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China





*

Author to whom correspondence should be addressed.



Academic Editor: Peter Van Puyvelde

Abstract For large-scale selective laser melting SLM additive manufacturing technology, three main problems severely restrict its development and application, namely the residual stress, defects, and columnar grains with anisotropy. To overcome these problems, a new method is proposed by combining SLM with ultrasonic impact treatment UIT technique. This study explores the feasibility of UIT assisted SLM, as well as the effect of UIT on the residual stress, defects and β grains of Ti-6Al-4V alloy sample. The results indicate that after the application of UIT during SLM, residual stress can be largely reduced and defects can be hammered flat and even eliminated. Meanwhile, the epitaxial growth of columnar grains is prevented, and fine equiaxed grains are formed due to plastic deformation and recrystallization. View Full-Text

Keywords: selective laser melting; ultrasonic impact treatment; residual stress; defects; grain selective laser melting; ultrasonic impact treatment; residual stress; defects; grain





Autor: Meixia Zhang 1, Changmeng Liu 1,* , Xuezhi Shi 1, Xianping Chen 2, Cheng Chen 1, Jianhua Zuo 1, Jiping Lu 1 and Shuyuan Ma 1

Fuente: http://mdpi.com/



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