Elucidation of mechanism wear carbon steel with structure of martensite

Authors

DOI:

https://doi.org/10.15802/stp2013/12244

Keywords:

carbon steel, railway wheel, hardness, martensite, degree of tetragonalness, crystalline lattice

Abstract

Purpose. The purpose of the paper is an estimation of degree of metal hardness change for the railway wheel with martensite structure during rolling. Methodology. As strength characteristic the Rockwell hardness is used. Wear tests were conducted in the conditions of normal loading with (10%) and without sliding on the test equipment SMTs-2. Parameters of the fine crystalline structure (tetragonality degree of the crystalline grid, dislocation density, scale of coherent scattering regions, and disturbance value of the crystalline grid of second kind) are determined by the methods of X-ray structural analysis. Findings. During operation of the railway wheels with different strength level, origin of defects on the wheel thread is caused by simultaneous action of both the friction forces and the cyclically changing loadings. Considering that formation of damage centers is largely determined by the state of metal volumes near the wheel thread, one should expect the differences in friction processes development at high contact stress for the wheels with different strength level and structural state. Originality. During the wear tests softening effect of carbon steel with martensite quenching structure is obtained. Softening effect equaled 3.5–7% from the level of quenched metal hardness. The softening effect is accompanied by the reduction of tetragonality degree of the crystalline structure of martensite, reduction of coherent scattering regions, dislocation density increase and crystalline grid disturbance of the second kind. Practical value. The results point out the necessity for further studies to clarify the resulted softening effect mechanism.

Author Biography

I. A. Vakulenko, Dep. “Materials Technology”, Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan

Lazaryan Str., 2, 49010, Dnipropetrovsk, Ukraine, tel. +38 (056) 373 15 56, e-mail dnyzt_texmat@ukr.net

References

Babich V.K., Gul Yu.P., Dolzhenkov I.Ye. Deformatsionnoe starenie stali [Strain aging of the steel]. Moscow, Metallurgiya Publ., 1972. – 320 s.

Vakulenko I.O., Anofriiev V.H., Hryshchenko M.A. Defekty zaliznychnykh kolis [Railway wheels faults]. Dnepropetrovsk, Makovetskyi Publ., 2009. 112 p.

Dzhugutov M.Ya. Plasticheskaya deformatsiya vysokolegirovannykh staley i splavov [Plastic deformation of the high–alloy steels and alloys]. Moscow, Metallurgiya Publ., 1978. 256 p.

Kurdyumov G.V., Utevskiy L.M., Entin R.I. Prevrashcheniya v zheleze i stali [Transformations in iron and steel]. Moscow, Nauka Publ., 1977. 236 p.

Kuslitskiy A.B. Nemetallicheskie vklyucheniya i ustalost stali [Non-metallic inclusions and steel fatigue]. Kyiv, Tekhnіka Publ., 1976. 128 p.

Larionov V.P., Kovalchuk V.A. Khladostoykost i iznos detaley mashin i svarnykh konstruktsiy [Cold resistance and wear of the machine parts and welded constructions]. Novosibirsk, Nauka Publ., 1976. 206 p.

Romaniv O.N., Yarema S.Ya., Nikiforchin G.N., Ponasyuk V.V. Mekhanika razrusheniya i prochnost materialov. T.4: Ustalost i tsiklicheskaya treshchinostoykost konstruktsionnykh materialov [Fracture mechanics. Vol. 4: Fatigue and cyclic crack resistance of structural materials]. Kyiv, Naukova dumka Publ., 1990. 680 p.

Dzh. F. Nott Osnovy mekhaniki razrusheniya [Foundations of the fracture mechanics]. Moscow, Metallurgiya Publ., 1978. 256 p.

Andreiko I.M., Ostash O.P., Kulyk V.V., Babachenko O.I., Vira V.V. Struktura ta opir ruinuvanniu stalei v riznykh zonakh zaliznychnykh kolis [Structure and resistance to steel destruction in different rail wheel zones]. Mashynoznavstvo – Machine Science, 2008, no. 5, pp.18-21.

Shadur L.A., Chelnokov I.I., Nikolskiy L.N. Vagony [Cars]. Moscow, Transport Publ., 1980. 439 p.

Shmykov A.A. Spravochnik termista [Guide of the heat–treater]. Moscow, GNTI Publ., 1952. 287 p.

Andrea G., Stefano C., Massimo C. Linea innovativa di trattamento termico di ruote ferroviarie. Risultati di processo e prodotto di esercizio. Ing. Ferrov, 2004, vol. 59, no. 9. pp.729-742.

Breyer N.N. The yield – point phenomenon in strain – aged martensite. Transactions of the Metallurgical Society of AIME, 1966, vol. 236, no. 8, рр. 1198-1202.

Paul B., Hashemi J. User’s Manual for Program CONTACT. Washington, 1977. 33 p.

Published

2013-04-25

How to Cite

Vakulenko, I. A. (2013). Elucidation of mechanism wear carbon steel with structure of martensite. Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, (2(44), 76–82. https://doi.org/10.15802/stp2013/12244

Issue

Section

MATERIAL SCIENCE