Combined Research of Dispersed Precipitates in High-Strength Steel
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Disperse precipitates in high-strength high-chromium martensite-ferrite steel of 0.15C–12Cr–Ni–Mo–W–V composition after various modes simulating the after-forging annealing were investigated. The investigated metal after holding at 1050°С for 1 h and quenching in oil was heat treated (HT) in two modes: HT 1—the after-forging annealing at 700°С for 6 h to relieve stresses; HT 2—HT 1 with the following isothermal annealing, heating to 1000°С, short holding, cooling to 700°С, and holding for 16 h. On the basis of the combined research, including optical metallography, X-ray phase analysis, transmission electron microscopy, and small-angle X-ray scattering, it was found that the tempered martensite structure with the ferrite phase of less than 1% was formed in the steel after HT 1; and after HT 2, transition from the martensiteferrite to ferrite-pearlite state took place; significant growth of carbides of the (Fe Cr)23C6 type and substructural components (coherent scattering areas, electron density inhomogeneity) was found; and finely dispersed particles of vanadium carbide V2C about 30 nm in size were formed.
Keywordssteel dispersed precipitates carbides heat treatment TEM XRD SAXS
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- 1.Yagodkin, Yu.D. and Dobatkin, S.V., Application of electron microscopy and X-ray diffraction analysis for determination of nanocrystal materials structure elements sizes (review), Zavod. Lab., Diagn. Mater., 2007, vol. 73, no. 1, pp. 38–48.Google Scholar
- 2.Sommariva, M., Gateshki, M., Gertenbach, J.A., Bolze, J., König, U., Vasile, B.S., and Surdu, V.A., Characterizing nanoparticles with a laboratory diffractometer: From small-angle to total X-ray scattering, Powder Diffr., 2014, vol. 29, pp. S47–S53. doi 10.1017/S0885715614001043CrossRefGoogle Scholar
- 3.Pauw, B.R., Everything SAXS: Small-angle scattering pattern collection and correction, J. Phys.: Condens. Matter., 2013, vol. 25. 383201. doi 10.1088/0953-8984/25/38/383201Google Scholar
- 5.Oba, J., Koppoju, S., Ohnuma, M., Murakami, T., Hatano, H., Sasakawa, K., Kitahara, A., and Susuki, J., Quantitative analysis of precipitate in vanadium-microalloyed medium carbon steels using smallangle X-ray and neutron scattering methods, ISIJ Int., 2011, vol. 51, no. 11, pp. 1852–1858.CrossRefGoogle Scholar
- 6.Lanskaya, K.A., Vysokokhromistye zharoprochnye stali (High-Chromium Heat-Resistant Steels), Moscow: Metallurgiya, 1976.Google Scholar
- 7.Kheiker, D.M. and Zevin, L.S., Rentgenovskaya difraktometriya (X-ray Diffractometry), Moscow: Fizmatgiz, 1963.Google Scholar
- 8.Bekrenev, A.N. and Mirkin, L.I., Malouglovaya rentgenografiya deformatsii i razrusheniya materialov (Small Angle X-ray Scattering of Deformation and Fracture of Materials), Moscow: Mosk. Gos. Univ., 1991.Google Scholar
- 9.Shchurov, A.F., Gracheva, T.A., and Malygin, N.D., Fizika tverdogo tela. Malouglovaya rentgenografiya kristallicheskikh i amorfnykh materialov (Solid State Physics. Small Angle X-ray Scattering of Crystalline and Amorphous Materials), Moscow: Vysshaya Shkola, 2001.Google Scholar
- 11.Rybin, V.V., Rubtsov, A.S., and Nesterova, E.V., The method of single reflexes (SR) and its application in electron microscopy analysis of disperse phases, Zavod. Lab., Diagn. Mater., 1982, no. 5, pp. 21–26.Google Scholar
- 12.Markova, Yu.M., Analysis of the transformations in the bainite-martensitic steel of the Cr–Ni–Mo–V composition under isothermal exposition and continuous cooling, Trudy IV mezhdunarodnoi nauchno-prakticheskoi konferentsii “Innovatsii na transporte i v mashinostroenii” (Proc. IV Int. Sci.-Pract. Conf. “Innovations in Transport and Mechanical Engineering”), St. Petersburg, 2016, pp. 97–100.Google Scholar
- 13.Frank-Kamenetskii, V.A., Rukovodstvo po rentgenovskomu issledovaniyu mineralov (Manual on X-ray Analysis of Minerals), Leningrad: Nedra, 1975.Google Scholar