Liquid Metal Embrittlement
Liquid metal embrittlement is a damage mechanism where molten metals under mechanical stress penetrate grain boundaries of the base material and cause cracks. This leads to deterioration of mechanical properties.
Physical-Chemical Mechanism of Action
Under mechanical stress, such as pressure or strain, molten metals can penetrate grain boundaries of the base material. This process is called embrittlement and leads to microcracks and cracks in the material.
Metallurgical Relevance & Welding Risks
Embrittlement can occur during welding processes, especially at high temperatures and mechanical loads. It leads to a deterioration of the mechanical properties of the material, increases susceptibility to cracking, and reduces strength. This can result in damage such as hot cracks or fracture in the weld pool or weld seam.
Workshop Practice & Action Instructions
To avoid embrittlement, it is important to carry out welding processes under optimal conditions. This includes correct selection of the welding process and materials, as well as adherence to temperature and stress limits. At high temperatures and mechanical loads, careful process control is essential. If necessary, use special protective measures such as damping or insulation to reduce mechanical stress.