Zhang, Y (2021) Review: Corrosion and stress corrosion cracking of wrought and additively manufactured 17-4 PH stainless steel. NPL Report. MAT 100

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Abstract

In the context of future use of additively manufactured (AM) 17-4 PH stainless steel (SS) for steam turbine blades, the present review evaluates corrosion resistance and stress corrosion cracking (SCC) behaviour of wrought and AM 17-4 PH SS. The threshold of chloride for pitting corrosion is reviewed for the wrought steel, and the impact of cyclic stress on corrosion potential and pitting initiation is also assessed. Only a limited number of studies concerning SCC testing of wrought 17‑4 PH SS are available in the literature. A few failure cases analyses from centrifugal compressor impellers and sailboat propeller shaft suggested the association of crack initiations with corrosion pits. An overview of the variations of AM processes and its impact on microstructure complexity and inhomogeneity are summarised. These impactful factors from AM process on corrosion and fatigue behaviour of 17-4 PH SS are discussed to provide implications for future testing.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 100
Subjects:	Advanced Materials > Corrosion
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.47120/npl.MAT100
Last Modified:	01 Feb 2022 15:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/9332

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