Critical Fracture Toughness
The critical fracture toughness indicates how much a material can deform under stress before it suddenly fractures. This is crucial for the safety of components.
Physical-Chemical Mechanism of Action
The critical crack toughness describes the point where a material can no longer deform under sustained stress and suddenly cracks. This is a plastic deformation phenomenon where the atomic structure is distorted so severely that it abruptly separates.
Metallurgical Relevance & Welding Risks
In the weld, excessive stress or insufficient hardness can overstress the material at its cracks. This leads to sudden failure and potential safety hazards, such as fractures or component destruction.
Shop Practice & Action Guidelines
To minimize critical crack toughness, it is important to maintain correct welding parameters such as stress and hardness. This requires careful selection of filler materials and processes, as well as precise control of temperatures and times during cooling.