On capabilities of thermomechanical treatment in increasing durability of short service life elements of mining аnd processing equipment
- 1 — Ph.D., Dr.Sci. professor Saint-Petersburg Mining University
- 2 — Ph.D. assistant lecture Saint-Petersburg Mining University
Abstract
Hadfield steel (110G13L) is the basic material for fast wornout items of mining equipment: beaters, hammers, liners, refractory plates of crushers and mills. By way of example, the effect of cold hardening was specifically analyzed on the rate of wear of mining equipment parts for various types of wear by hard (more than 1100 HV) and soft rock. A unique ability of that steel to resist shock wear is noted. It is shown that this steel exhibits low resistance to abrasive rock wear. Meanwhile wear by rock of hardness lower than steel (less than 1100 HV), may be substantially increased by pre-hardening of samples (up to 10-fold). In case of wear by high hardness rocks, shock impact that should contribute to hardening of the material, fails to increase abrasive wear resistance of Hadfield steel, and in that parameter it does not differ from the conventional medium carbon steel 45. Also, the authors of this article describe a technique they developed of high-temperature thermomechanical treatment of specimen of Hadfield steel (free forging at 1150-950ºC and subsequent quenching in water) and experiments in their abrasion. The results of tests show that hardness and wear resistance of Hadfield steel to hard abrasive (corundum 25A with aggregate hardness of ~2500 HV) increases with plastic deformation at HTMT. For maximum plastic deformation intensity (deformation magnitude of α = 2.25), reached in the experiments by the authors, wear resistance grew by 70% as compared to undeformed steel. The dependence is presented of wear resistance of steel on hardness, HV, achieved in the result of plastic deformation. Since a similar positive effect was obtained earlier by the authors for 35HGSA steel, also used in mining machinery, they conclude that the HTMT technique may be recommended for treating short lived parts of the mining and mineral processing equipment to increase their service life.
References
- Bogachev I.N., Egolaev V.F. Structure and properties of ferromanganese alloys. Moscow: Metallurgija, 1973, p.296 [in Russian].
- Bolobov V.I., Chupin S.A. The effect of type of strengthening treatment on wear resistance of material for mining machinery. Zapiski Gornogo instituta. 2015. Vol.216, p.44-49 [in Russian].
- Bolobov V.I. Hadfield steel wear resistance at high specific loads. Gornoe oborudovanie i jelektromehanika. 2012. N 10, p.12-14 [in Russian].
- Blyukher V.V., Parfenov L.I., Volchok I.P. Properties of plastically deformed high manganese steel. Metallovedenie i termicheskaya obrabotka metallov. 1970. N 12, p.32-33 [in Russian].
- Smirnov M.A., Pyshmintsev I.Yu., Laev K.A., Akhmed'yanov A.M. Effevt of high temperature thermomechanical treatment on the properties of high chromium steel. Vestnik Yuzhno-Ural'skogo gosudarstvennogo universiteta. Seriya: Metallurgiya. 2012. N 39 (298), p.85-88 [in Russian].
- Gulyaev A.P. Metal Science. Moscow: Metallurgija, 1986, p.544 [in Russian].
- Davydov N.G. High manganese steel. Moscow: Metallurgiya, 1979, p.176 [in Russian].
- Zasypkin A.D., Dement'ev V.B. Hardening of caterpillar machinery track fingers by HTMT screw compression. Traktory i sel'khozmashiny. 2012. N 4, p.37-39 [in Russian].
- Bolobov V.I., Batalov A.P., Bochkov V.S., Chupin S.A. Wear resistance of steel 110G13L in different abrasive media. Zapiski Gornogo instituta. 2014. Vol.209, p.17-22 [in Russian].
- Gur'yanov D.A., Tesker E.I., Zamotaev B.N., Rubezhanskaya I.V. Studying the effects of deformation parameters of meral rolling during repeated HTMT on the mechanical properties of steel. Izvestiya Volgogradskogo gosudarstvennogo tekhnicheskogo universiteta. 2009. Vol.3. N 11, p.134-137 [in Russian].
- Zamotaev B.N., Eremin M.P., Chechin S.V., Kandaurov A.S. Studying the effects of thermal and deformation rolling parameters during repeated HTMT with interim tempering on the mechanical properties of steel. Izvestiya Volgogradskogo gosudarstvennogo tekhnicheskogo universiteta. 2013. Vol.8. N 15, p.96-99 [in Russian].
- Lahtin Ju.M., Leont'eva V.P. Material Science. Moscow: Mashinostroenie, 1990, p.528 [in Russian].
- Parfenov P.I., Sorokin G.A. Structure and wear resistance of steel G13L. Metallovedenie i termicheskaya obrabotka metallov. 1969. N 1, p.67-68 [in Russian].
- Smirnov M.A., Pyshmintsev I.Yu., Laev K.A., Khramkov E.V., Alyutin D.M. Effevt of high temperature thermomechanical treatment on the properties of high chromium steel. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta im. G.I.Nosova. 2015. N 3 (51), p.78-82 [in Russian].
- Tenenbaum M.M. Wear resistance of parts and longevity of mining machinery. Moscow: Gosgortekhizdat, 1960, p.238 [in Russian].
- Khrushchov M.M., Babichev M.A. Studies of metal wear. Moscow: Izd-vo AN SSSR, 1960, p.351 [in Russian].
- Shavrin O.I., Dement'ev V.B. Experience in applying the HTMT process of screw compression to manufacture axially symmetric parts. Metallovedenie i termicheskaya obrabotka metallov. 2002. N 8, p.27-29 [in Russian].
- Barroqueiro B., Dias-De-Oliveira J., Pinho-Da-Cruz J., Andrade-Campos A. Multiscale analysis of heat treatments in steels: Theory and practice. Finite Elements in Analysis and Design. 2016. Vol.114, p.39-56. DOI: 10.1016/j.finel.2016.02.004
- Dobrzański L.A., Czaja M., Borek W., Labisz K. & Tański T. Influence of hot-working conditions on a structure of X11MnSiAl17-1-3 steel for automotive industry. International Journal of Materials and Product Technology, 2015, N 51(3), p.264-280. DOI:10.1504/IJMPT.2015.072246
- Krishna S.C., Tharian K.T., Chakravarthi K.V.A., Jha A.K. & Pant B. Heat treatment and thermo-mechanical treatment to modify carbide banding in AISI 440C steel: A case study. Metallography, Microstructure, and Analysis, 2016, N 5(2), p.108-115. DOI:10.1007/s13632-016-0266-0