Wear resistance and thermal fatigue resistance of cr12 die steel

Abrasion resistance.

The main factor affecting the life of a mold is usually the wear resistance of the mold material. Since the mold is subjected to a large compressive stress and friction in operation, it is necessary for the mold to maintain dimensional accuracy under strong friction. The main forms of wear are mechanical wear, oxidation wear and melt wear. h13 mold steel processing In order to improve the wear resistance of mold steel, it is necessary to make the mold steel have both high hardness and good composition, morphology and distribution of carbide or other hardening phases. For dies used under heavy load and high speed wear conditions, it is required to form a thin, dense, well adhered oxide film on the surface of the die steel to maintain lubrication, reduce melt wear, cause bonding and welding between the die and workpiece, and also reduce oxidation wear on the die surface caused by oxidation. Therefore, the working conditions of die steel have a great influence on steel wear.

Using simulation test methods, it is possible to measure the wear resistance index at different chemical compositions and microstructures as a parameter to characterize the level of wear resistance. Shows the life before a specified burr height to reflect the level of wear resistance of various steel grades; the test is based on steel.

Thermal fatigue resistance.

Under service conditions, hot work tool steels are affected not only by cyclic load variations, but also by high temperatures and cyclic rapid cooling heating. Therefore, attention should be paid to the evaluation of the thermomechanical fatigue fracture performance of the material. Thermomechanical fatigue comprehensive performance indicators include thermomechanical fatigue performance, mechanical fatigue crack expansion rate and fracture toughness.

Thermal fatigue performance reflects the working life of the material before the sprouting of thermal fatigue cracks. Materials with high thermal fatigue resistance have more thermal cycles of thermal fatigue crack sprouting; mechanical fatigue crack expansion rate reflects the growth of each stress cycle when the crack expands internally under the action of forging after thermal fatigue crack sprouting, and fracture toughness reflects the resistance of the material in the process of crack destabilization expansion.