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Hydrogen Embrittlement of Additively Manufactured Inconel 718

Precipitation hardenable nickel alloys are commonly used in oil and gas offshore structures where requires outstanding mechanical strength and corrosion resistance. In seawater galvanic coupling to steel or cathodic protection promotes the formation of atomic hydrogen on the surface of Inconel 718. Hydrogen atoms further dissolve into the metal matrix and cause hydrogen embrittlement. The unconventional Additive Manufacturing (AM) process generates fine microstructure and alters surface finish that affect hydrogen intake process and the subsequent hydrogen embrittlement. The effects of hydrogen embrittlement are investigated on different build orientations and surface finish of AM Inconel 718 by slow strain rate (SSR) testing in seawater environment under cathodic protection. The susceptibility of AM 718 to hydrogen embrittlement is discussed based on the SSR results and metallography analysis with respect to its wrought counterpart.

Product Number: 51319-13453-SG
Author: Liu Cao
Publication Date: 2019
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51314-3948-Hydrogen Embrittlement Susceptibility of Precipitation Hardened Ni-Alloys

Product Number: 51314-3948-SG
ISBN: 3948 2014 CP
Author: Carlo Malara
Publication Date: 2014
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