CoCrFeNiTi-based high-entropy alloy with superior tensile strength and corrosion resistance achieved by a combination of additive manufacturing using selective electron beam melting and solution treatment

An investigation of mechanical properties of Ti6Al4V produced by additive manufacturing (AM) in the as-printed condition have been conducted and compared with wrought alloys. The AM samples were built by Selective Laser Melting (SLM) and Electron Beam Melting (EBM) in 0°, 45° and 90°—relative to horizontal direction. Similarly, the wrought samples were also cut and tested in the same directions relative to the plate rolling direction. The microstructures of the samples were significantly different on all samples. α′ martensite was observed on the SLM, acicular α on EBM and combination of both on the wrought alloy. EBM samples had higher surface roughness (Ra) compared with both SLM and wrought alloy. SLM samples were comparatively harder than wrought alloy and EBM. Tensile strength of the wrought alloy was higher in all directions except for 45°, where SLM samples showed higher strength than both EBM and wrought alloy on that direction. The ductility of the wrought alloy was consistently higher than both SLM and EBM indicated by clear necking feature on the wrought alloy samples. Dimples were observed on all fracture surfaces.

Download Full-text

Microstructure and mechanical properties of WMoTaNbTi refractory high-entropy alloys fabricated by selective electron beam melting

Journal of Material Science and Technology ◽

10.1016/j.jmst.2021.07.041 ◽

2021 ◽

Author(s):

Bang Xiao ◽

Wenpeng Jia ◽

Huiping Tang ◽

Jian Wang ◽

Lian Zhou

Keyword(s):

Mechanical Properties ◽

Electron Beam ◽

Electron Beam Melting ◽

High Entropy Alloys ◽

High Entropy ◽

Microstructure And Mechanical Properties ◽

Selective Electron Beam Melting

Download Full-text

Microgeometry of the surface of electron beam additive manufacturing products. Selective electron beam melting

10.36652/1813-1336-2021-17-9-408-418 ◽

2021 ◽

pp. 408-418

Author(s):

E.V. Krasnova ◽

Yu.A. Morgunov ◽

B.P. Saushkin

Keyword(s):

Electron Beam ◽

Additive Manufacturing ◽

Physical Model ◽

Electron Beam Melting ◽

Metallurgical Process ◽

Additive Technology ◽

Selective Electron Beam Melting ◽

Surface Microgeometry ◽

Microstructure Of The Material

The results of the analysis of works related to the formation of surface microgeometry in the process of selective electron-beam melting are presented, and the physical model of this process is refined. The developing additive technology of selective electron-beam alloying and the directions in which its research is carried out, in particular, the analysis of the metallurgical process, the formation of the microstructure of the material, the formation of microstructure defects, are described. The roughness of the surface of products obtained by the SEBM technology, as well as the microgeometry of surfaces and the mechanisms of its formation, depending on various parameters of the process, are considered.

Download Full-text