Forging primarily improves the wear resistance of metals by altering their microstructure and improving mechanical properties, without changing their basic chemical composition.

1. Grain Refinement

Plastic deformation under high temperature and pressure triggers dynamic recrystallization, forming a fine-grained structure. Finer grains increase the material's hardness and strength, directly improving wear resistance.

2. Optimized Grain Flow (Fiber-like) Structure

Forging creates continuous, oriented metal flow lines aligned with the part's shape. This optimized flow line distribution avoids the formation of truncated fibrous textures, thus improving surface toughness and resistance to wear and fatigue wear.

3. Elimination of Casting Defects

Forging compresses and seals voids, pores, and shrinkage cavities within the casting process. A denser, more uniform internal structure reduces wear-prone defects, thus lowering the risk of surface damage.

4. Improved Mechanical Properties (Hardness and Toughness Balance)

Forging improves tensile strength, yield strength, and surface hardness. Higher hardness helps resist abrasive scratches; good toughness prevents spalling or cracking under repeated frictional loads.

5. Reduced Internal Segregation

Reforging deformation results in a more uniform distribution of alloying elements. Reduced chemical segregation avoids the formation of localized softening zones, thus preventing rapid wear.

Common Applications

Due to its excellent wear resistance, forging is the preferred manufacturing method for high-stress, high-friction components, including:

Automotive: Crankshafts, gearbox gears, and constant velocity joints.

Industrial Tools: Dies, hammers, cutting blades, and drill bits.

Aerospace: Turbine disks, landing gear components, and rotor shafts.

Final Summary:

Forging improves wear resistance by refining grains, creating optimal metal flow lines, eliminating casting defects, homogenizing the microstructure, and enhancing a combination of hardness and toughness.