wear resistance.
1. Tungsten Carbide
2. Molybdenum Carbide
3. Chromium Carbide
4. Iron Carbide
8.1.3.2 Tungsten carbide is the hardest of the commercially available carbides within the price structure
feasible for hardfacing applications. It provides the maximum resistance to wear, although most hardfacing
alloy deposits contain mixtures of two or more of the carbide forming elements. This balanced combination of
carbides provides a tougher structure, resulting in a more wear resistant deposit.
8.1.4 Wear Factors
8.1.4.1 Impact and Corrosion - These two wear factors can be discussed jointly because the
requirements of a hardfacing alloy to combat them are similar.
8.1.4.1.1 Impact occurs when an object is struck by another object. Compression occurs in the form of weight
or pressure. The material is said to have good resistance to impact or compressive loads when the yield
strength of the material exceeds that of the opposing force.
8.1.4.1.2 Weld metals for hardsurfacing or buildup applications must have the following characteristics
to successfully combat wear being caused by impact or compression.
8.1.4.2 Buildup Alloys - When the force of a blow is less than the yield strength of the deposit weld
metal, the weld metal absorbs the force with no deformation. When the force of the blow exceeds the yield
strength of the deposited weld metal, the weld metal deforms, resulting in roll over or upset.
