Surface integrity of machined electron beam melted Ti6Al4V alloy manufactured with different contour settings and heat treatment
Paper in proceedings, 2020

The powder-bed-fusion-based Electron Beam Melting (EBM) is rapidly gaining interest as a feasible process in the manufacturing industry for producing intricate Ti6Al4V components. However, there is still a challenge of reducing production time and optimizing surface roughness. One way to improve surface roughness is to optimize the melting strategy, i.e. contour setting. This not only influences the obtained surface topographical features, but also the production time. Most industrial applications require subtractive post processing (machining) to obtain a desired functional surface. This paper is concerned with analysing surface and subsurface in turning of Ti6Al4V alloy, manufactured by EBM using different contour settings. Also, the effect of subsequent heat treatment, i.e. Hot Isostatic Pressing (HIP) is studied. The results indicate that avoiding of contours require a machining allowance of 1 mm to obtain surface roughness of about 0.5 ┬Ám (Sa). In case of three and five contours the machining allowance can be reduced to 0.25 mm. Microstructural differences originating from the subsequent HIP operation show no effect on machinability. Tensile residual stresses are generated when reaching down to the heat effected zone of contour settings.

Machining

Contour setting

Titanium alloy

Electron Beam Melting

Additive Manufacturing

Surface Integrity

Author

Dinesh Mallipeddi

Chalmers, Industrial and Materials Science, Materials and manufacture

Tina Hajali

Chalmers, Industrial and Materials Science, Materials and manufacture

Lars-Erik Rännar

Mid Sweden University

Axel Bergström

AIM Sweden AB

Sinuhé Hernández

AB Sandvik Coromant

Emil Strandh

Swerim AB

Lars Nyborg

Chalmers, Industrial and Materials Science, Materials and manufacture

Peter Krajnik

Chalmers, Industrial and Materials Science, Materials and manufacture

Procedia CIRP

22128271 (ISSN)

Vol. 87 20 327-332

5th CIRP Conference on Surface Integrity, CSI 2020
, ,

Innovativ pulverbaserad komponentteknologi (INNOKOMP)

VINNOVA, 2017-06-01 -- 2019-05-31.

Areas of Advance

Production

Subject Categories

Manufacturing, Surface and Joining Technology

DOI

10.1016/j.procir.2020.02.091

More information

Latest update

1/7/2021 1