A critical review on susceptibility of stress corrosion cracking in maraging steel weldments

Stress corrosion cracking is the decay of mechanical characteristics of sensitive material under the mixed effects of stress and corrosive atmosphere. Because of their high strength and extremely good fracture toughness 18 Ni maraging steel (250 grade) is suitable for aerospace application such as rocket engines as these steel materials can be welded without much hassles over a broad range of thickness. The maraging steel weldment causes catastrophic failure during service owing to stress corrosion cracking. It is a challenge to comprehend the SCC behaviour for the weldment of this material. The attempts of this review paper are to analyse the mechanical and microstructural changes related to SCC due to some post weld heat treatment or surface modifications. Further, review was made to intuit the effect of different welding processes on SCC behaviour of this material. Apart from a brief review of 18 Ni maraging steel, this paper presents the impact of different corrosive environments on SCC activity. The effect of different filler materials and composition of the filler material were also investigated. (C) 2019 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International conference on Materials and Manufacturing Methods.