Structure-phase states and properties of rail tread surface at long-term operation
Using the methods of modern physical material science the investigations of structure-phase states and properties at different depth from tread surface of differentially quenched rails at extremely long-term operation (passed tonnage 1411 mln t) are carried out. The hardness decrease from 37.1 to 35.8 HRC at the depth 2 and 10 mm and microhardness from 1481 to 1210 MPa, respectively is revealed. The established multiple transformation of tread surface structure concludes in: fracture of lamellar pearlite structure and subgrain structure formation of submicronsizes (100-150 nm); precipitation of carbide phase nanoparticles (30-55 nm)along the boundaries and in the volume ofsubgrains; growth of microdistorsions and α-Fe crystal lattice parameter; growth of scalar and excess dislocation density. The suggestions about the possible reasons of observable regularities are made.
Keywords
rail tread surface,
structure,
properties,
dislocations,
long-termoperationAuthors
| Ivanov Yu.F. | Institute of High Current Electronics SB RAS | yufi55@mail.ru |
| Kormyshev V.E. | Siberian State Industrial University | gromov@physics.sibsiu.ru |
| Gromov V.E. | Siberian State Industrial University | gromov@physics.sibsiu.ru |
| Yuriev A.A. | JSC «Evraz West-Siberian Metallurgical Combine» | ant-yurev@yandex.ru |
Всего: 4
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