Elastic pin coupling overheating and overheating: Overheating refers to the coarse grain length after the steel exceeds the allowable temperature during heating.
Elastic pin coupling overheating and overheating: Overheating refers to the coarse grain length after the steel exceeds the allowable temperature during heating. Stress occurs: due to the difference in heat inside and outside the metal, the expansion is uneven, and internal stress is generated, which is called thermal stress. If the temperature is too high during annealing to cause a graphite cross section, it will be difficult to cut and overheat and deform during quenching. Decarburization causes soft spots on the surface of the workpiece, reducing the hardness, wear resistance and fatigue strength of the surface.
The presence of banded carbide on the surface of the elastic pin coupling will make the hardness and microstructure after quenching and tempering uneven and easy to deform. This is also a kind of banded structure in which pearlite and ferrite appear along the direction of processing deformation. defect. However, if the temperature is low or the temperature is low during annealing, the pearlite is not completely globalized, and it is not conducive to cutting and subsequent heat treatment. Over-burning can not be remedied: Elastic pin coupling bismuth oxide: yttrium oxide not only loses a lot of steel, but also reduces the surface quality of the forging and the service life of the forging die. If pressed into the metal, it will cause the forging to be scrapped.
Fractures occur in the cross section of the elastic pin coupling: this defect destroys the chemical composition and uniformity of the steel, reduces the quenching hardness, and deteriorates the mechanical properties. At the same time, it will also reduce the plasticity of steel.
Elastic pin coupling A hard and brittle reticular carbide: it weakens the bond between the crystals, significantly degrading the mechanical properties, especially the impact toughness, but can be improved or eliminated by normalizing. Decarburization: Decarburization refers to the phenomenon that all or part of the carbon on the steel surface is burned off.
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