Page 132 - 摩擦学学报2025年第5期

766 摩擦学学报（中英文） 第 45 卷

≈ 229 μm
≈286 μm
≈ 251 μ m

Rolling direction 200 μm Rolling direction 200 μm Rolling direction 200 μm

(a) Rail 1# welded zone (b) Rail 2# welded zone (c) Rail 3# welded zone

≈203 μm ≈217 μm
≈243 μm

Rolling direction 200 μm Rolling direction 200 μm Rolling direction 200 μm

(d) Rail 1# heat affected zone (e) Rail 2# heat affected zone (f) Rail 3# heat affected zone
Fig. 9 OM micrographs of plastic deformation layer of different rail welded joints
图 9 钢轨焊接接头塑性变形层的OM照片

Subsurface crack
Subsurface cracks
Surface material peeling off parallel to the surface

Internal crushing of the material Crack tip expands
inward bending

Rolling direction 50 μm Rolling direction 50 μm Rolling direction 50 μm
(a) Rail 1# welded zone (b) Rail 2# welded zone (c) Rail 3# welded zone

Rolling direction 100 μm Rolling direction 100 μm Rolling direction 100 μm
(d) Rail 1# heat affected zone (e) Rail 2# heat affected zone (f) Rail 3# heat affected zone

Fig. 10 SEM micrographs of cross-section cracks of rail welded joints
图 10 钢轨焊接接头剖面裂纹的SEM照片

裂纹角度随着珠光体片层间距的增加而减小，整体差 大，损伤程度却有所减轻. 片层间距的增大导致裂纹

异不大[图12(b)]. 1#钢轨的珠光体片层间距最小，损 在钢轨中的阻力减小，从而更容易扩展，同时也更容
伤程度也最小；3#钢轨比2#钢轨的珠光体片层间距 易断裂去除，因此磨损率增大的同时减轻了损伤.