Residual Stress Relaxation
Relaxation of residual stress is the process by which introduced compressive residual stresses in metals are reduced under thermal or mechanical loading. This is critical for the long-term stability of components.
Physical-Chemical Mechanism of Action
Residual stress relaxation occurs when metals are loaded under stress and these stresses are not fully balanced. At elevated temperatures or under mechanical loading, these stresses can slowly be relieved.
Metallurgical Relevance & Welding Risks
Improper handling during welding can lead to residual stresses that may cause cracking or distortion over time. It is important to minimize these stresses to ensure the service life and safety of the components.
Shop Practice & Action Items
To avoid residual stresses, take the following measures during welding:
• Use even heating and cooling of the component.
• Make sure the weld is not overstressed.
• Use suitable welding processes and materials that allow low stress buildup.