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Heat treatment of shaft parts

Heat treatment of shaft parts

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  • Time of issue:2021-06-16 10:06
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(Summary description)Heat treatment of shaft parts.

Heat treatment of shaft parts

(Summary description)Heat treatment of shaft parts.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2021-06-16 10:06
  • Views:
Information

 

The performance of shaft parts is related to the type of steel selected and the heat treatment adopted.Before the forging blank is processed, normalizing or annealing treatment should be arranged (carbon steel and alloy steel with carbon greater than WC =0.7%) to refine the internal grains of the steel and eliminate the forging stress.Reduce material hardness and improve machining performance.

 

In order to obtain better comprehensive mechanical properties, shaft parts often require tempering and tempering treatment.When the blank allowance is large, the conditioning is arranged after the rough car and before the half rough car, so as to eliminate the residual stress produced when the rough car;When the blank allowance is small, the conditioning can be arranged before the rough car.Surface quenching is generally arranged before finishing, which can correct the high deformation caused by quenching. For the shaft with high precision requirements, it is necessary to carry out low temperature aging treatment (long time low temperature effect in 160℃ oil) after local quenching or rough grinding to ensure the stability of the size.

 

For nitride steels (e.g., 38GrMoAl), quenching and low temperature aging should be performed before nitriding.The quality of the quenching and tempering is also very strict, not only requires that the soxenite structure after quenching and tempering should be evenly refined.In addition, the maximum fraction of ferrite carbon in the layer 8 ~ 10mm from the surface should not exceed WC =5%, otherwise it will cause nitride brittleness and affect the quality of ferrite.

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