Tungsten
Tungsten forms high-melting special carbides that increase the hot strength and wear resistance of tool steels.
Physical-Chemical Mechanism of Action
Tungsten reacts with carbon in the melt to form high-melting special carbides like WC (tungsten carbide). These carbides have high strength and remain stable at high temperatures.
Metallurgical Relevance & Welding Risks
The high melting point of tungsten carbides provides improved hot hardness, which is especially useful in harsh environments. However, too much tungsten can lead to increased toughness and reduced formability. Improper welding procedures can alter the microstructure, impairing tool performance.
Workshop Practice & Action Instructions
To benefit from tungsten, careful control of carbon content and melting temperatures is essential during production and welding of tool steels. Over-optimizing the tungsten content can increase toughness, which may lead to reduced formability.