Turnbull, A (2017) Corrosion issues associated with additive manufacturing with stainless steel - implications for testing. NPL Report. MAT 86

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Abstract

An introduction is given to additive manufacturing (AM) processes and the impact of such processes on the subsequent metallurgical, mechanical and corrosion properties of stainless steel (SS), with a particular focus on 316L SS as being the material most commonly studied. The main differences with respect to the traditional processing route include generation of pores, oriented and inhomogeneous microstructure, elemental segregation, residual stress, elevated yield stress, reduced fatigue resistance (in as-built condition) and poorer corrosion resistance. Thermal treatment to reduce residual stress and grinding, bead blasting or laser remelting to improve the surface condition can significantly recover properties of the as-built material to an extent. Annealing and hot isostatic pressing combined with an appropriate surface finishing procedure is the most effective method of optimising properties but even then there are remnants of oriented microstructure and residual pores, albeit of low density. It is essential to develop international guidelines for corrosion and environmentally assisted cracking testing of AM products to encourage confident application of such products in harsh environments. Research to support the development of these guidelines is required.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 86
Subjects:	Advanced Materials > Corrosion
Divisions:	Engineering, Materials & Electrical Science
Last Modified:	27 Feb 2018 14:55
URI:	http://eprintspublications.npl.co.uk/id/eprint/7730

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