Structure and properties of high strength low alloyed cold-resistant steel after reheat and direct quenching with tempering

The paper shows comparative investigations of structure of rolled plates from low alloyed coldresistant steel 08CrNi2MoCuNb with guaranteed yield strength 750 MPa after traditional reheat quenching and quenching from rolling heat (direct quenching) with subsequent high temperature tempering. The research is carried out by means of optical metallography, SEM and TEM. The peculiarities of parameters of bainitemartensite structure, which influence the strength level in initial (quenched) state, are revealed. Also, the impact of tempering on structure and properties of rolled plates after reheat and direct quenching is shown. 

1. Pallaspuro , A.S., Kaija l a inen, A., Mehtonen , S., e t a l., Effect of microstructure on the impact toughness transition temperature of direct-quenched steels, Materials Science & Engineering A., 2018, January, V. 712, pp. 671–680.

2. J i a , T. , Zhou , Y. , Jia, X. , Wang , Z. , Effects of microstructure on CVN impact toughness in thermomechanically processed high strength microalloyed steel, Metall. Mater. Trans. A., (2016), 48, pp. 685– 696.

3. Hut chinson, B., Hagström, J., Karlsson , O . , e t a l ., Microstructures and hardness of asquenched martensites (0.1–0.5% C), Acta Mater., 2011, V. 59, pp. 5845–5858.

4. Termicheskaya obrabotka v mashinostroyenii [Heat treatment in mechanical engineering]: Handbook, Lakhtin, Yu.M., Rakhstadt, A.G., Moscow: Mashinostroenie, 1980.

5. Khlusova, E.I., Golosienko, S . A . , Motovilina, G.D., Pazilova, U.A., Vliyanie legirovaniya na strukturu i svoistva vysokoprochnoy khladostoykoy stali posle termicheskoy i termomekhanicheskoy obrabotki [The effect of alloying on the structure and properties of high-strength cold-resistant steel after thermal and thermomechanical processing], Voprosy Materialovedeniya, 2007, No 1(49), pp. 20–31.

6. Sych , O.V. , Golubeva, M.V. , Khlusova, E. I ., Razrabotka khladostoikoy svarivayemoy stali kategorii prochnosti 690 MPa dlia tyazhelonagruzhennoy tekhniki, rabotaiushchey v arkticheskikh usloviyakh [Development of cold-resistant weldable steel of strength category 690 MPa for heavy-duty equipment operating in arctic conditions], Tiazheloe mashinostroenie, 2018, No 4, pp. 17–25.

7. Golosienko, S.A. , Soshina, T .V. , Khlusova , E . I ., Novye vysokoprochnye khladostoykie stali dlia arkticheskogo primeneniya [New high-strength cold-resistant steels for arctic use], Proizvodstvo prokata, 2014, No 2, pp. 17–24.

8. Khlusova, E. I . , Golosienko, S.A. , Motovilina, G.D., Vozmozhnosti povysheniya prochnostnykh kharakteristik ekonomnolegirovannykh vysokoprochnykh staley za schet obrazovaniya nanorazmernykh karbidov [Possibilities of increasing the strength characteristics of economically alloyed highstrength steels due to the formation of nanosized carbides], Voprosy Materialovedeniya, 2010, No 3(59), pp. 52–64.

9. Schastlivtsev, V.M., Tabatchikova, T.I., Yakovleva , I.L., Egorova, L.Yu. , Vatunin, K.A., Golosienko, S.A., Kruglova, A.A., Khlusova, E . I . , Vliyanie termomekhanicheskoy obrabotki na strukturu i mekhanicheskie svoistva sudostroitelnoy stali tipa 09KhN2MDF [The influence of thermomechanical processing on the structure and mechanical properties of shipbuilding steel type 09KhN2MDF], Voprosy Materialovedeniya, 2008, No 1, pp. 20–32.

10. Akihide , N. , Takayuki , I . , Tadashi O., Development of YP 960 and 1100 MPa Class Ultra High Strength Steel Plates with Excellent Toughness and High Resistance to Delayed Fracture for Construction and Industrial Machinery, JFE Technical Report, 2008, June, No 11.

11. Muckelroy, N.C. , Findley, K.O. , Bodnar , R.L., Microstructure and Mechanical Properties of Direct Quenched Versus Conventional Reaustenitized and Quenched Plate, Journal of Materials Engineering and Performance, 2013, V. 22(2), pp. 512–522.

12. Gorynin, I.V., Rybin, V.V., Malyshevsky, V.A., Khlusova, E . I . , Nesterov a , E.V. , Orlov , V.V. , Kalini n , G.Yu . , Ekonomnolegirovannye stali s nanomodifitsirovannoy strukturoy dlia ekspluatatsii v ekstremalnykh usloviyakh [Economically alloyed steels with nanomodified structure for operation in extreme conditions], Voprosy Materialovedeniya, 2008, No 2(54), pp. 7–19.

13. Golosienko, S.A. , I lyin , A.V. , Lavrentiev , A.A. , e t a l . , Soprotivlenie khrupkomu razrusheniyu vysokoprochnoy srednelegirovannoy stali i ego svyaz s parametrami strukturnogo sostoyaniya [Resistance to brittle fracture of high-strength medium alloy steel and its relationship with structural state parameters], Voprosy Materialovedeniya, 2019, No 3 (99), pp. 128–147.

14. Takayama , N. , Miyamoto , G. , Furuhara , T. , Effects of transformation temperature on variant pairing of bainitic ferrite in low carbon steel, Acta Materialia, 2012, V. 60, pp. 2387–2396.

15. Zolotorevsky, N.Yu. , Z isman, A.A., Panpurin, S . N . , Titovets, Yu.F., Vliyanie razmera zerna i deformatsionnoy substruktury austenita na kristallogeometricheskie osobennosti beynita i martensita nizkouglerodistykh staley [The effect of grain size and deformation substructure of austenite on the crystallo-geometric features of bainite and martensite of low-carbon steels], Metallovedenie i termicheskaya obrabotka metallov, 2013, No 10, pp. 39–48.

16. Sych, O.V., Orlov, V.V., Kruglova, A.A. , Khlusova , E. I . , Izmenenie struktury vysokoprochnoy trubnoy stali klassa prochnosti K70-K80 pri varyirovanii rezhimov vysokotemperaturnogo otpuska posle termomekhanicheskoy obrabotki [Changing the structure of high-strength pipe steel of strength class K70-K80 with varying modes of high-temperature tempering after thermomechanical processing[, Voprosy Materialovedeniya, 2011, No 1(65), pp. 89–99.

17. Zisman, A.A., Zoloto revsky, N.Yu. , Petrov, S.N., Khlusova, E.I., Yashina , E.A., Panoramny kristallografichesky analiz evoliutsii struktury pri otpuske nizkouglerodistoy martensitnoy stali [Panoramic crystallographic analysis of the evolution of the structure during tempering of low-carbon martensitic steel], Metallovedenie i termicheskaya obrabotka metallov, 2018, No 3, pp. 10–17.

18. Zisman, A.A., Petrov, S .N., Ptashnik, A.V., Kolichestvennaya attestatsiya beynitnomartensitnykh struktur vysokoprochnykh legirovannykh staley metodami skaniruyushchey elektronnoy mikroskopii [Quantitative certification of bainitic-martensitic structures of high-strength alloy steels by scanning electron microscopy], Metallurg, 2014, No 11, pp. 91–95.