Surface integrity of machined electron beam melted Ti6Al4V alloy manufactured with different contour settings and heat treatment
Artikel i vetenskaplig tidskrift, 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 µm (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.

Surface Integrity

Electron Beam Melting

Additive Manufacturing

Machining

Titanium alloy

Contour setting

Författare

Dinesh Mallipeddi

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Tina Hajali

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Lars-Erik Rännar

Mittuniversitetet

Axel Bergström

AIM Sweden AB

Sinuhé Hernández

AB Sandvik Coromant

Emil Strandh

Swerim AB

Lars Nyborg

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Peter Krajnik

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Procedia CIRP

22128271 (ISSN)

Vol. 87 327-332

Innovativ pulverbaserad komponentteknologi (INNOKOMP)

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

Styrkeområden

Produktion

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

DOI

10.1016/j.procir.2020.02.091

Mer information

Skapat

2020-07-14