Brake disc material for forging high-speed train

Abstract

The invention discloses a brake disc material for forging a high-speed train. The brake disc material comprises the following components by mass percent: 0.16%-0.25% of C, 0.25%-0.60% of Si, 0.80%-1.30% of Mn, 0.70%-1.20% of Cr, 0.01%-0.03% of W, 0.80%-1.30% of Ni, 0.40%-0.70% of Mo, 0.05%-0.20% of Cu, 0.18%-0.25% of SiC, 0.20%-0.30% of Al2O3, 0.03%-0.15% of V, 0.0050%-0.025% of N, 0.005%-0.20% of Re, not more than 0.015% of P, not more than 0.010% of S and the balance of Fe. The brake disc material is high in wear resistance and good in thermal cracking resistance, the high-speed train can be safely and reliably braked, and the use and repair costs of the high-speed train are reduced.

Description

technical field [0001] The invention relates to a high-speed train braking device, in particular to the material of the brake disc in the high-speed train braking device. Background technique [0002] The material performance of the brake disc body of high-speed train is one of the most critical technical issues in the brake device. Under the braking conditions of high-speed trains and harsh operating conditions, the huge braking thermal load and thermal shock will bring high thermal stress and temperature gradient. Therefore, the brake disc material must have good high-temperature mechanical properties and thermal conductivity, as well as low elastic modulus and low thermal expansion coefficient, so that the braking heat can be dissipated quickly. The brake disc material should also have high thermal fatigue strength and manufacturing dynamic life. Specifically, high-speed train brake discs should have the following properties: first, stable and uniform friction performan...

AI Technical Summary

Problems solved by technology

As far as the structure of the brake disc is concerned, since the brake disc has a disc-shaped structure, the braking speed on different circumferences of the friction surface of the brake disc varies greatly, thus forming uneven thermal stress. The temperature is much lower than that of the outer side of the disc, and the brake disc made of homogeneous material has the same heat resistance and wear resistance of each part. This consistency just brings about the inconsistency of fatigue and wear. Accelerates the occurrence probability and expansion speed of thermal cracks, which is not conducive to the improvement of the service life of the brake disc

Therefore, as the train continues to increase in speed, when its speed reaches or even exceeds 300Km / h, the existing brake disc materials and structural design cannot well meet the braking requirements of high-speed trains.

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