Nickel Alloy Stress Corrosion Cracking
Nickel alloy stress corrosion cracking is cracking in nickel materials under tensile stress and corrosive media. Nickel-chromium-iron alloys are resistant to this.
Physical-Chemical Mechanism of Action
Nickel alloy stress corrosion cracking occurs when mechanical tensile stresses in nickel materials act together with corrosive media. The stresses can enlarge cracks in the material, which are then further expanded by corrosive agents.
Metallurgical Relevance & Welding Risks
This corrosion can lead to significant cracking and loss of strength. Nickel-chromium-iron alloys, commonly used in severe applications, are particularly susceptible. Incorrect welding parameters or insufficient pre-treatment can increase the risk.
Workshop Practice & Action Points
To avoid this corrosion, careful alloy selection is crucial. During welding, maintain high stress rates and short heat durations. After welding, properly drain and treat the material for corrosion resistance.