Retained austenite regulated flexible gear special steel and preparation method thereof
A technology of retained austenite and special steel, which is applied in the field of special steel for flex wheel with adjustment of retained austenite and its preparation field, can solve the problems of restricting the level of domestic harmonic reducers and strict performance requirements of flex wheel materials, etc. Satisfy long-term stable performance, highlight fatigue resistance, and improve fatigue performance
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[0036] In particular, the preparation method specifically includes the following steps:
[0037] (1) Solution heat treatment: first heat the billet of the special steel for the flexwheel to 1140-1180°C, and then keep it warm for 2 hours;
[0038] (2) Two-stage hot rolling: the starting temperature of the first stage of hot rolling is 1100±10°C, and the finishing temperature is controlled above 960°C; the starting temperature of the second stage of hot rolling is 820±10°C, and the finishing temperature is controlled at Above 780°C, the metal plate for flexible splines can be obtained;
[0039] (3) One-time normalizing treatment: Inductively heat the metal plate for the flexible spline to 830°C±10°C, heat and hold for 60 minutes and then air-cool;
[0040] (4) Two critical heat treatments:
[0041] The first critical heat treatment: Inductively heat the air-cooled flexible wheel metal plate, adjust the induction heating temperature to 730°C±10°C, heat and keep it for 10 minute...
Embodiment 1
[0047] Specific composition of experimental steel:
[0048] C:0.46%, Nb:0.039%, Cr:2.01%, Si:0.16%, Mn:1.03%, Ni:2.54%, Mo:0.21%, Cu:0.39%, S:≤0.005%, P:≤0.008 %, the rest is Fe and unavoidable impurities.
[0049] Preparation process:
[0050] (1) Heat the vacuum-melted steel ingot to 1150°C for 2 hours to homogenize the composition of the steel ingot;
[0051] (2) Carry out the rolling of the steel ingot after the homogenization treatment in the first stage, the starting rolling temperature is 1106°C, the finishing rolling temperature is 987°C, and the three-pass rolling reductions are respectively 22.4%, 23.3%, and 24.8%; The rolling temperature in the second stage is 816°C, the final rolling temperature is controlled at 790°C, the rolling reductions in the six passes are 23.4%, 22.5%, 21.0%, 18.6%, 15.2%, and 12.3%, and the rolling is accelerated to room temperature;
[0052] (3) The rolled sample is subjected to the first normalizing treatment: induction heating of the...
Embodiment 2
[0060] Specific composition of experimental steel:
[0061] C:0.48%, Nb:0.036%, Cr:1.91%, Si:0.17%, Mn:1.03%, Ni:2.58%, Mo:0.23%, Cu:0.37%, S:≤0.004%, P:≤0.006 %, the rest is Fe and unavoidable impurities.
[0062] Preparation process:
[0063] (1) Heat the vacuum-melted steel ingot to 1150°C for 2 hours to homogenize the composition of the steel ingot;
[0064] (2) Carry out the first-stage rolling of the steel ingot after the homogenization treatment, the starting rolling temperature is 1104°C, the finishing rolling temperature is 987°C, and the three-pass rolling reductions are respectively 21.4%, 23.0%, and 24.5%; The rolling temperature of the second stage is 790°C, the final rolling temperature is controlled at 745°C, the rolling reductions of the six passes are 23.5%, 22.0%, 19.6%, 18.0%, 15.2%, and 12.5%, and the rolling is accelerated to room temperature;
[0065] (3) The rolled sample is subjected to the first normalizing treatment: induction heating of the metal ...
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