Porosity Regrowth During Heat Treatment of Hot Isostatically Pressed Additively Manufactured Titanium Components

Samuel Tammas-Williams; Philip Withers; Iain Todd; Philip Prangnell

doi:10.1016/j.scriptamat.2016.05.002

Porosity Regrowth During Heat Treatment of Hot Isostatically Pressed Additively Manufactured Titanium Components

Samuel Tammas-Williams, Philip Withers, Iain Todd, Philip Prangnell

The University of Sheffield

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Abstract

X-ray computed tomography has been used to track the behaviour of individual pores found in selective electron beam melted additive manufactured titanium. Porosity was found to shrink below the detection limit of X-ray microtomography (<5 µm) upon hot isostatic pressing. Spherical argon containing gas pores, which have a high internal gas pressure following hot isostatic pressing, have been found to progressively reappear and grow in proportion to their original as-built size during high temperature (β-anneal) treatments, whereas larger irregular low pressure pores did not reappear. The implications of these observations in terms of additive manufacturing are discussed.

Original language	English
Pages (from-to)	72-76
Number of pages	5
Journal	Scripta Materialia
Volume	122
Early online date	24 May 2016
DOIs	https://doi.org/10.1016/j.scriptamat.2016.05.002
Publication status	Published - Sept 2016

Keywords

Additive Manufacture; Selective Electron Beam Melting; Pores; Heat treatment; Hot isostatic pressing

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.scriptamat.2016.05.002Licence: CC BY

Next Generation Multi-Dimensional X-ray Imaging
Withers, P. (PI), Burke, G. (CoI), Cernik, R. (CoI), Haigh, S. (CoI), Lee, P. (CoI) & Lionheart, W. (CoI)
1/02/15 → 31/01/20
Project: Research

Cite this

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title = "Porosity Regrowth During Heat Treatment of Hot Isostatically Pressed Additively Manufactured Titanium Components",

abstract = "X-ray computed tomography has been used to track the behaviour of individual pores found in selective electron beam melted additive manufactured titanium. Porosity was found to shrink below the detection limit of X-ray microtomography (<5 µm) upon hot isostatic pressing. Spherical argon containing gas pores, which have a high internal gas pressure following hot isostatic pressing, have been found to progressively reappear and grow in proportion to their original as-built size during high temperature (β-anneal) treatments, whereas larger irregular low pressure pores did not reappear. The implications of these observations in terms of additive manufacturing are discussed.",

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author = "Samuel Tammas-Williams and Philip Withers and Iain Todd and Philip Prangnell",

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doi = "10.1016/j.scriptamat.2016.05.002",

language = "English",

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journal = "Scripta Materialia",

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T1 - Porosity Regrowth During Heat Treatment of Hot Isostatically Pressed Additively Manufactured Titanium Components

AU - Tammas-Williams, Samuel

AU - Withers, Philip

AU - Todd, Iain

AU - Prangnell, Philip

PY - 2016/9

Y1 - 2016/9

N2 - X-ray computed tomography has been used to track the behaviour of individual pores found in selective electron beam melted additive manufactured titanium. Porosity was found to shrink below the detection limit of X-ray microtomography (<5 µm) upon hot isostatic pressing. Spherical argon containing gas pores, which have a high internal gas pressure following hot isostatic pressing, have been found to progressively reappear and grow in proportion to their original as-built size during high temperature (β-anneal) treatments, whereas larger irregular low pressure pores did not reappear. The implications of these observations in terms of additive manufacturing are discussed.

AB - X-ray computed tomography has been used to track the behaviour of individual pores found in selective electron beam melted additive manufactured titanium. Porosity was found to shrink below the detection limit of X-ray microtomography (<5 µm) upon hot isostatic pressing. Spherical argon containing gas pores, which have a high internal gas pressure following hot isostatic pressing, have been found to progressively reappear and grow in proportion to their original as-built size during high temperature (β-anneal) treatments, whereas larger irregular low pressure pores did not reappear. The implications of these observations in terms of additive manufacturing are discussed.

KW - Additive Manufacture; Selective Electron Beam Melting; Pores; Heat treatment; Hot isostatic pressing

U2 - 10.1016/j.scriptamat.2016.05.002

DO - 10.1016/j.scriptamat.2016.05.002

M3 - Article

SN - 1359-6462

VL - 122

SP - 72

EP - 76

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Porosity Regrowth During Heat Treatment of Hot Isostatically Pressed Additively Manufactured Titanium Components

Abstract

Keywords

UN SDGs

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Next Generation Multi-Dimensional X-ray Imaging

Cite this