Microstructural Alignment
Microstructural alignment is the directional arrangement of crystals in a metal via heat flow or deformation. This affects mechanical properties and can lead to different hardness levels.
Physical-Chemical Mechanism of Action
Microstructural alignment occurs due to directed heat flow or plastic deformation during the welding process. These processes lead to an arrangement of crystals in the direction of heat conduction or strain.
Metallurgical Relevance & Welding Risks
Non-uniform alignment can cause different hardness levels and mechanical properties within a material. This can lead to cracks, wear, or uneven load capacity of the weld. An example is the development of glass-hard martensite in cooler areas, leading to hot cracks.
Workshop Practice & Action Guidelines
To ensure homogeneous alignment, take the following steps:
• Use a uniform heat treatment concept (e.g., austenitizing before final welding).
• Ensure the weld cools uniformly and continuously.
• Avoid rapid cooling by using cooling water or cooling gases.