Hastelloy Stress Corrosion Cracking
Hastelloy stress corrosion cracking is a sudden, crack-like damage of Hastelloy structures under tensile stresses and chlorides. The high purity of the alloy minimizes this risk.
Physical-Chemical Mechanism of Action
Hastelloy stress corrosion cracking occurs when nickel-molybdenum-based alloys come into contact with tensile stresses and chlorides. The stresses can enlarge cracks in the material, which are then attacked by chloride ions. This leads to rapid, crack-like destruction of the structure.
Metallurgical Relevance & Welding Risks
This corrosion can lead to sudden cracks and failure of components, especially in chemical or marine environments. The high alloy purity of Hastelloy minimizes this risk because it absorbs fewer chloride ions and better distributes stresses in the material.
Workshop Practice & Instructions
To avoid Hastelloy stress corrosion cracking, the following should be considered:
• The weld should be guided as precisely as possible to minimize stresses.
• Chlorides in the vicinity of the component should be avoided or neutralized.
• When selecting materials, pay attention to the purity and proper composition of the Hastelloy alloy.