Page 43 - 《摩擦学学报》2020年第3期

第 3 期 刘颍宾, 等: 列车车轮滚动接触疲劳裂纹评价研究 309

(a) (b)

50 μm 10 μm

(c) (d)

1 mm 100 μm

(e)

20 μm

Fig. 5 Micro-morphology of the surface of the standard rolling contact fatigue sample (a) (b) without spalling
and (c) (d) (e) spalling pit
图 5 标准接触疲劳样品表面未剥离(a) (b)及剥离坑(c) (d) (e)的微观形貌

500 550
(a) Left (b) Left
Spalling depth Middle 500 Spalling depth Middle
Microhardness/HV 400 Microhardness/HV 450
450
Right
Right
400
350
300
250 350
300
0.0 0.5 1.0 1.5 2.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0
Distance from surface/mm Distance from surface/mm

Fig. 6 Gradient microhardness of the left，middle and right sides of the spalling pit on (a) the standard rolling
contact fatigue sample and (b) service wheel
图 6 标准接触疲劳样品(a)和实际服役车轮(b)剥离坑左侧、中间和右侧近表层显微硬度梯度