Post-welding heat treatment method for bainite steel rails
A post-weld heat treatment and bainite technology, which is applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of low longitudinal hardness and insufficient fatigue life, and achieve extended fatigue life, high fatigue life, improved wear and resistance The effect of grinding performance
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Embodiment 1
[0046] The bainitic rail welded joint obtained by flash welding at a temperature of 1300°C is subjected to the first-stage cooling, and the first-stage cooling is performed at a first cooling rate of 6.0°C / s to cool the rail head surface temperature of the rail joint to Air cooling was carried out at 280°C. Then, the medium-frequency induction profiling electric heating coil is used to heat the entire cross-section of the welded joint area of the rail. When the tread temperature of the rail reaches 850°C, the heating is stopped, and then the second stage cooling is carried out at the second cooling rate of 3.0°C / s to cool the rail joint to 480°C, and finally the third cooling rate is carried out at the third cooling rate of 0.6°C / s. The three-stage cooling is used to reduce the surface temperature of the rail head of the rail joint to room temperature (25° C.), so as to obtain the bainite rail welded joint of the present invention after post-weld heat treatment.
[0047] In...
Embodiment 2
[0054]The bainite rail welded joint obtained by gas pressure welding at a temperature of 1150°C is subjected to the first-stage cooling, and the first-stage cooling is performed at a first cooling rate of 7.0°C / s to cool the surface temperature of the rail head of the rail joint to 330°C. Then, an oxy-acetylene flame profiling heater is used to heat the entire section of the rail welded joint area. When the tread temperature of the rail reaches 830 °C, the heating is stopped, and then the water mist mixture is used to cool the rail joint to 500 °C at the second cooling rate of 3.5 °C / s, and finally the second cooling rate is 0.40 °C / s. The third stage of cooling is carried out at three cooling speeds to reduce the surface temperature of the rail head of the rail joint to room temperature (25° C.), thereby obtaining the bainite rail welded joint of the present invention after post-weld heat treatment.
[0055] In the post-weld heat treatment process, the first cooling is natur...
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