Continuous electron beam post-treatment of ebf3-fabricated ti–6al–4v parts

Alexey Panin, Marina Kazachenok, Olga Perevalova, Sergey Martynov, Alexandra Panina, Elena Sklyarova

Research output: Contribution to journalArticle

Abstract

In the present study, the methods of optical, scanning electron, and transmission electron microscopy as well as X-ray diffraction analysis gained insights into the mechanisms of surface finish and microstructure formation of Ti–6Al–4V parts during an EBF3-process. It was found that the slip band propagation within the outermost surface layer provided dissipation of the stored strain energy associated with martensitic transformations. The latter caused the lath fragmentation as well as precipitation of nanosized β grains and an orthorhombic martensite α” phase at the secondary α lath boundaries of as-built Ti–6Al–4V parts. The effect of continuous electron beam post-treatment on the surface finish, microstructure, and mechanical properties of EBF3-fabricated Ti–6Al–4V parts was revealed. The brittle outermost surface layer of the EBF3-fabricated samples was melted upon the treatment, resulting in the formation of equiaxial prior β grains of 20 to 30 µm in size with the fragmented acicular α phase. Electron-beam irradiation induced transformations within the 70 µm thick molten surface layer and 500 µm thick heat affected zone significantly increased the Vickers microhardness and tensile strength of the EBF3-fabricated Ti–6Al–4V samples.

Original languageEnglish
Article number699
JournalMetals
Volume9
Issue number6
DOIs
Publication statusPublished - 1 Jun 2019

Fingerprint

Electron beams
Microstructure
Martensitic transformations
Heat affected zone
Strain energy
Martensite
Microhardness
X ray diffraction analysis
Molten materials
Tensile strength
titanium alloy (TiAl6V4)
Irradiation
Transmission electron microscopy
Scanning
Mechanical properties
Electrons

Keywords

  • Additive manufacturing
  • Continuous electron beam post-treatment
  • Electron beam free-form fabrication
  • Microstructure
  • Surface finish
  • Surface hardening

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Continuous electron beam post-treatment of ebf3-fabricated ti–6al–4v parts. / Panin, Alexey; Kazachenok, Marina; Perevalova, Olga; Martynov, Sergey; Panina, Alexandra; Sklyarova, Elena.

In: Metals, Vol. 9, No. 6, 699, 01.06.2019.

Research output: Contribution to journalArticle

Panin, Alexey ; Kazachenok, Marina ; Perevalova, Olga ; Martynov, Sergey ; Panina, Alexandra ; Sklyarova, Elena. / Continuous electron beam post-treatment of ebf3-fabricated ti–6al–4v parts. In: Metals. 2019 ; Vol. 9, No. 6.
@article{66974fe114584d0e8ecd68a27fa62bb3,
title = "Continuous electron beam post-treatment of ebf3-fabricated ti–6al–4v parts",
abstract = "In the present study, the methods of optical, scanning electron, and transmission electron microscopy as well as X-ray diffraction analysis gained insights into the mechanisms of surface finish and microstructure formation of Ti–6Al–4V parts during an EBF3-process. It was found that the slip band propagation within the outermost surface layer provided dissipation of the stored strain energy associated with martensitic transformations. The latter caused the lath fragmentation as well as precipitation of nanosized β grains and an orthorhombic martensite α” phase at the secondary α lath boundaries of as-built Ti–6Al–4V parts. The effect of continuous electron beam post-treatment on the surface finish, microstructure, and mechanical properties of EBF3-fabricated Ti–6Al–4V parts was revealed. The brittle outermost surface layer of the EBF3-fabricated samples was melted upon the treatment, resulting in the formation of equiaxial prior β grains of 20 to 30 µm in size with the fragmented acicular α′ phase. Electron-beam irradiation induced transformations within the 70 µm thick molten surface layer and 500 µm thick heat affected zone significantly increased the Vickers microhardness and tensile strength of the EBF3-fabricated Ti–6Al–4V samples.",
keywords = "Additive manufacturing, Continuous electron beam post-treatment, Electron beam free-form fabrication, Microstructure, Surface finish, Surface hardening",
author = "Alexey Panin and Marina Kazachenok and Olga Perevalova and Sergey Martynov and Alexandra Panina and Elena Sklyarova",
year = "2019",
month = "6",
day = "1",
doi = "10.3390/met9060699",
language = "English",
volume = "9",
journal = "Metals",
issn = "2075-4701",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "6",

}

TY - JOUR

T1 - Continuous electron beam post-treatment of ebf3-fabricated ti–6al–4v parts

AU - Panin, Alexey

AU - Kazachenok, Marina

AU - Perevalova, Olga

AU - Martynov, Sergey

AU - Panina, Alexandra

AU - Sklyarova, Elena

PY - 2019/6/1

Y1 - 2019/6/1

N2 - In the present study, the methods of optical, scanning electron, and transmission electron microscopy as well as X-ray diffraction analysis gained insights into the mechanisms of surface finish and microstructure formation of Ti–6Al–4V parts during an EBF3-process. It was found that the slip band propagation within the outermost surface layer provided dissipation of the stored strain energy associated with martensitic transformations. The latter caused the lath fragmentation as well as precipitation of nanosized β grains and an orthorhombic martensite α” phase at the secondary α lath boundaries of as-built Ti–6Al–4V parts. The effect of continuous electron beam post-treatment on the surface finish, microstructure, and mechanical properties of EBF3-fabricated Ti–6Al–4V parts was revealed. The brittle outermost surface layer of the EBF3-fabricated samples was melted upon the treatment, resulting in the formation of equiaxial prior β grains of 20 to 30 µm in size with the fragmented acicular α′ phase. Electron-beam irradiation induced transformations within the 70 µm thick molten surface layer and 500 µm thick heat affected zone significantly increased the Vickers microhardness and tensile strength of the EBF3-fabricated Ti–6Al–4V samples.

AB - In the present study, the methods of optical, scanning electron, and transmission electron microscopy as well as X-ray diffraction analysis gained insights into the mechanisms of surface finish and microstructure formation of Ti–6Al–4V parts during an EBF3-process. It was found that the slip band propagation within the outermost surface layer provided dissipation of the stored strain energy associated with martensitic transformations. The latter caused the lath fragmentation as well as precipitation of nanosized β grains and an orthorhombic martensite α” phase at the secondary α lath boundaries of as-built Ti–6Al–4V parts. The effect of continuous electron beam post-treatment on the surface finish, microstructure, and mechanical properties of EBF3-fabricated Ti–6Al–4V parts was revealed. The brittle outermost surface layer of the EBF3-fabricated samples was melted upon the treatment, resulting in the formation of equiaxial prior β grains of 20 to 30 µm in size with the fragmented acicular α′ phase. Electron-beam irradiation induced transformations within the 70 µm thick molten surface layer and 500 µm thick heat affected zone significantly increased the Vickers microhardness and tensile strength of the EBF3-fabricated Ti–6Al–4V samples.

KW - Additive manufacturing

KW - Continuous electron beam post-treatment

KW - Electron beam free-form fabrication

KW - Microstructure

KW - Surface finish

KW - Surface hardening

UR - http://www.scopus.com/inward/record.url?scp=85070456496&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85070456496&partnerID=8YFLogxK

U2 - 10.3390/met9060699

DO - 10.3390/met9060699

M3 - Article

AN - SCOPUS:85070456496

VL - 9

JO - Metals

JF - Metals

SN - 2075-4701

IS - 6

M1 - 699

ER -