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Treatment of full-length tracks and then

Consumption generated. 3.2 Under arrest quenching on hardness obtained from the metallographic observation. Less-speed rail through the fine pearlite obtained after quenching, while improved strength and toughness, hardness also increased. Research shows that in the case of uniform pearlite. The higher the hardness of the rail. Wear better. In the past, a traditional view that the wear and peel is a contradiction, people were worried that hardness will speed up the rail surface of the strip, so I hope not too high hardness,[link widoczny dla zalogowanych], J. In fact, the research shows that stripping is a form of contact fatigue damage, which produced the first is due to wheel-rail contact stress reaches a certain value I from the surface of the plastic deformation of rail,[link widoczny dla zalogowanych], and then form a scaly surface cracks, leading to peeling -6J. After a less-speed rail after quenching, the yield strength and hardness increase, which effectively inhibited the production of plastic deformation. Thereby improving the contact fatigue performance of rail, rail will improve the performance of the anti-stripping. 3.3 tip catch on residual stress in quenching experiments show that the surface residual stress fatigue strength and the size and nature of a certain amount of tensile and compressive residual stress has a good effect against contact fatigue, residual stress fatigue fracture extended time. Residual tensile stress and vice versa. The results of residual stress (see Table 4) showed that after quenching by less speed rail head surface residual stress, which can improve the rail surface fatigue strength. On the other hand, the rail section to obtain a more reasonable distribution of residual stress. Tread rail head, the rounded corners, sides and chin are the amount of residual stress, central to a smaller waist rail residual stress (or tensile stress),[link widoczny dla zalogowanych], Center for the smaller rail base residual tensile stress, thereby increasing then track the use of poison life. f the next turn 76 J of Northern Jiaotong University Vol 22 pieces under the resonant current waveform, the width of which corresponds to slightly wider in the original irregular pulse current pulse 020408080100l20 prince Yu 6 irregular harmonic cut photo electricity. 7 straight pulse peak current inhibition ring current resonant converter as the device switches at zero current conditions, can effectively improve the switching frequency, reduce losses, but the resulting increase in current rating can not be ignored. In this paper, caused when the inverter commutation high pulse peak resonant current problem, a circuit topology. The simulation study shows. This circuit topology can effectively suppress the peak current pulse, and maintain a stable resonant current for the switching device to create zero-current switching conditions.
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