Powiadomienia systemowe
- Sesja wygasła!
Tytuł artykułu
Treść / Zawartość
Pełne teksty:
Identyfikatory
Warianty tytułu
Mikrostrukturalne aspekty długotrwałego starzenia stali martenzytycznych typu 9% Cr z dodatkiem i bez dodatku boru
Języki publikacji
Abstrakty
The study covered 9% Cr martensitic steels - X10CrMoVNb9-1 (P91) and X13CrMoCoVNbNB9-2-1 (PB2) after long-term ageing at the temperature of 620°C and soaking time up to 50,000 hours. The microstructural investigations of the tested steels were carried out using a TITAN 80-300 transmission electron microscope. The analysis of the changes in the microstructure included the identification of precipitates and computer image analysis: the measurement of dislocation density and mean diameter of the precipitates. The tests showed that the analysed steels still retained the lath martensitic microstructure, but also the processes of matrix softening were observed. The microstructure of the examined steels also showed numerous precipitates with various morphologies. The micro-addition of boron in the PB2 steel, compared with the P91 steel, influenced the retardation of the microstructure degradation processes through the limitation of the growth of M23C6 precipitates and Laves phase. This resulted in a slowdown in the processes of recovery and polygonisation of the matrix of the tested steel.
Badaniu poddano martenzytyczne stale typu 9% Cr - X10CrMoVNb9-1 (P91) oraz X13CrMoCoVNbNB9-2-1 (PB2) po długotrwałym starzeniu w temperaturze 620°C i czasie wygrzewania do 50 000 godzin. Badania mikrostrukturalne badanych stali przeprowadzono za pomocą transmisyjnego mikroskopu elektronowego TITAN 80–300. Analiza zmian w mikrostrukturze obejmowała identyfikację wydzieleń oraz komputerową analizę obrazu: pomiar gęstości dyslokacji i średniej średnicy wydzieleń. Przeprowadzone badania wykazały, że analizowane stale posiadały nadal zachowaną listwową mikrostrukturę martenzytyczną, ale także obserwowano procesy mięknięcia osnowy. W mikrostrukturze badanych stali widoczne były również liczne wydzielenia o różnej morfologii. Mikrododatek boru w stali PB2 w porównaniu do stali P91 wpłynął na spowolnienie procesów degradacji mikrostruktury poprzez ograniczenie wzrostu wydzieleń M23C6 i fazy Lavesa. Wpłynęło to na spowolnienie procesów zdrowienia i poligonizacji osnowy badanej stali.
Czasopismo
Rocznik
Tom
Strony
27--33
Opis fizyczny
Bibliogr. 18 poz., rys., tab.
Twórcy
autor
- Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology Institute of Materials Engineering
autor
- Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology Institute of Materials Engineering
autor
- Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology Institute of Materials Engineering
Bibliografia
- [1] R. Mishnev, N. Dudova, A. Fedoseeva, R. Kaibyshev. Microstructural aspect of superior creep resistance of a 10% Cr martensitic steel. Materials Science and Engineering: A, 2016, 678, p. 178-189.
- [2] C.G. Panait, W. Bendick, A. Fuchsmann, A.F. Gourgues-Lorenzon, J. Besson. Study of the microstructure of the Grade 91 steel after more than 100,000 h of creep exposure at 600°C. Int. J. of Pressure Vessels and Piping, 2010, 87 (6), p. 326-335.
- [3] H. Wang, W. Yan, S. Zwaag, Q. Shi, W. Wang, K. Yang, Y. Shan. On the 650o C thermostability of 9-12Cr heat resistant steels containing different precipitates. Acta Materialia, 2017, 134, p. 143-154.
- [4] W. Zhong, W. Wang, X. Yang, W. Li, W. Yan, W. Sha, W. Wang, Y. Shan, K. Yang. Relationship between Laves phase and impact brittleness of P91 steel reevaluated. Materials Science and Engineering: A, 2015, 639, p. 252-258.
- [5] M. Yoshizawa, M. Igarashi, K. Moriguchi, A. Iseda, H.G. Armaki, K. Maruyama. Effect of precipitates on long-term creep deformation properties of P92 and P122 type advanced ferritic steels for USC power plants. Materials Science and Engineering A, 2009, 510-511, p. 162-168.
- [6] A. Kostka, K.G. Tak, R.J. Hellmig, Y. Estrin, G. Eggeler. On the contribution of carbides and micrograin boundaries to the creep strength of tempered martensite ferritic steels. Acta Materialia, 2007, 55 (2), p. 539-550.
- [7] M. Hättestrand, H.O. Andrén. Boron distribution in 9-12% chromium steels. Materials Science and Engineering: A, 1999, 270, p. 33-37.
- [8] J.G. Zhang, F.W. Noble, B.L. Eyre. Comparison of effects of aging on fracture of 9Cr-1Mo and 2•25Cr-1Mo steel Part 1 Quenched and tempered material, Materials Science and Technology, 1991, 7 (3), p. 218-223.
- [9] H.G. Armaki, R.P. Chen, K. Maruyam, M. Yoshizawa, M. Igarashi. Static recovery of tempered lath martensite microstructures during long-term aging in 9-12% Cr heat resistant steels. Materials Letters, 2009, 63 (28), p. 2423-2425.
- [10] G. Golański. Effect of the heat treatment on the structure and properties of GX12CrMoVNbN9-1 cast steel. Archives of Materials Science and Engineering, 2010, 46 (2), p. 88-97.
- [11] F. Abe. Coarsening behavior of lath and its effect on creep rates in tempered martensitic 9Cr-W steels. Materials Science and Engineering: A, 2004, 387–389, p. 565-569.
- [12] F. Abe. New martensitic steels. In: A. Di Gianfrancesco, Materials for Ultra-Supercritical and Advanced Ultra-Supercritical Power Plants, series: Woodhead Publishing in energy, no. 104. Duxford, UK, Cambridge, MA: Woodhead Publishing 2017, p. 323-374.
- [13] J.S. Lee, H.G. Armaki, K. Maruyama, T. Muraki, H. Asahi. Causes of breakdown of creep strength in 9Cr-1.8W-0.5Mo-VNb steel. Materials Science and Engineering: A, 2006, 428 (1-2), p. 270-275.
- [14] X. Guo, J. Gong, Y. Jiang, D. Rong. The influence of long-term aging on microstructures and static mechanical properties of P92 steel at room temperature. Materials Science and Engineering: A, 2013, 564, p. 199-205.
- [15] G. Golański, A. Zielińska-Lipiec, S. Mroziński, C. Kolan. Microstructural evolution of aged heat-resistant cast steel following strain controlled fatigue. Materials Science and Engineering: A, 2015, 627, p. 106-110.
- [16] H.K. Danielsen, J. Hald. Infuence of Z-phase on long-term creep stability of martensitic 9 to 12% Cr steels. VGB PowerTech Journal, 2009, (5), p. 68-73.
- [17] H.K. Danielsen, J. Hald. Behaviour of Z phase in 9–12% Cr steels. Energy Materials Materials Science and Engineering for Energy Systems, 2006, 1 (1), p. 49-57.
- [18] G. Golański, A. Zielińska-Lipiec, A. Zieliński, M. Sroka. Effect of long-term service on microstructure and mechanical properties of martensitic 9% Cr steel. J. of Materials Engineering and Performance, 2017, 26 (3), p. 1101-1107.
Uwagi
Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-fdbb489a-0c1d-4cec-866e-03359c477696