Sulfur Inclusion Morphology
The shape and distribution of manganese sulfides in steel, influenced by controlled deoxidation and additives. This reduces the notching effect.
Physical-Chemical Mode of Action
Manganese sulfides form from the interaction of manganese and sulfur. They are usually found as small, angular crystals in the microstructure.
Metallurgical Relevance & Welding Risks
An uncontrolled sulfide inclusion morphology can lead to increased notch sensitivity and impair the toughness of the steel. Too many or too large manganese sulfides can also cause hot cracking and distortion.
Workshop Practice & Action Instructions
To achieve an optimal sulfide inclusion morphology, it's important to tightly control the sulfur content in the weld pool. A sulfur content of about 0.1 to 0.2 % is common. Additionally, targeted deoxidation steps should be carried out to avoid the formation of large sulfide crystals.