The front drive shaft is an important part of the car. During the operation of the car, it inevitably has to bear huge friction. Therefore, it wears out relatively quickly. For this reason, it is very effective to use medium frequency induction quenching equipment to quench and heat treat it. necessary. Today, we are not going to talk about the induction quenching process of the front drive shaft. Let’s talk about the metallographic inspection after quenching.
The parts quenched by the medium frequency induction quenching equipment were inspected by magnetic particle inspection, and no defective magnetic marks were found. Cut the continuously quenched 42CrMo steel power output driven shaft parts along the longitudinal diameter line, use a grinder to remove the affected layer of the line cutting, and then put it into a 50% hydrochloric acid aqueous solution for hot acid etching at a heating temperature of 65-80 ℃, heating time 20-30min, finally neutralize with alkaline water, clean, and then blow dry with compressed air. After drying, the depth of the induction quenching hardened layer is clearly visible. The metallographic results after quenching of the front drive shaft are that the depth of the hardened layer of the optical axis is 5.37mm, the microstructure grade is 5-6, the surface hardness is 53-55HRC, and the depth of the hardened layer of the splines is 7.8mm, showing that The microstructure level is level 6 and the surface hardness is 53-55HRC.
The junction of multi-step shaft parts is a weak point strengthened by induction quenching. The hardened layer is continuous after being strengthened by induction quenching with medium-frequency induction quenching equipment, so that the hardness, strength and residual compressive stress at the step can be continued, thereby improving the stress concentration at the sharp corner of the step. Fatigue strength at 10°C to meet technical and usage requirements.
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GS-ZP-1200
