Effect of Varying Heat Treatment Regimes on Microstructure and Mechanical Properties of P92 Steel Welds

DOI https://doi.org/10.15407/pmach2022.02.038
Journal Journal of Mechanical Engineering – Problemy Mashynobuduvannia
Publisher A. Pidhornyi Institute for Mechanical Engineering Problems
National Academy of Science of Ukraine
ISSN  2709-2984 (Print), 2709-2992 (Online)
Issue Vol. 25, no. 2, 2022 (June)
Pages 38-59
Cited by J. of Mech. Eng., 2022, vol. 25, no. 2, pp. 38-59

 

Authors

Vinay Kumar Pal, Department of Mechanical Engineering, Sam Higginbottom University of Agriculture, Technology and Sciences (Allahabad, 211 007, Uttar Pradesh, India), e-mail: gaurishankar.vinaypal@gmail.com, ORCID: 0000-0001-7830-570X

Lokendra Pal Singh, Department of Mechanical Engineering, Sam Higginbottom University of Agriculture, Technology and Sciences (Allahabad, 211 007, Uttar Pradesh, India), e-mail: ORCID: 0000-0002-6221-8174

 

Abstract

Cr-Mo steels are well-known for their high temperature application in thermal power plants. P91, P911 and P92 are most commonly used Cr-Mo steels for high temperature application. The steels de-rived their strength from tempered martensite and precipitates of MX and M23C6 type. The normalizing and tempering of the steels are performed before putting them in service condition. The present manuscript describes the effect of the varying heat treatment regimes on microstructure and mechanical properties of the P92 steel. The normalizing effect on microstructure and mechanical properties has been studied. The normalizing was performed in the range of 950–1150 ºC. The effect of the varying tempering time on mechanical behavior of the P92 steel has also been studied and effort to develop relation between microstructure and mechanical properties was made. Optical microscope and scanning electron microscope have been utilized for microstructure study. To characterize the mechanical behavior, tensile, hardness and Charpy impact toughness tests were performed.

 

Keywords: P92, microstructure, mechanical properties, normalizing, tempering.

 

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References

  1. Klueh, R. L. (2005). Elevated temperature ferritic and martensitic steels and their application to future nuclear reactors. International Materials Reviews, vol. 50, iss. 5, pp. 287–310. https://doi.org/10.1179/174328005X41140.
  2. Mannan, S. L., Chetal, S. C., Raj, B., & Bhoje, S. B. (2003). Selection of materials for prototype fast breeder reactor. Transactions of the Indian Institute of Metals, pp. 1–35.
  3. Shrestha, T., Alsagabi, S. F., Charit, I., Potirniche, G. P., & Glazoff, M. V. (2015). Effect of heat treatment on microstructure and hardness of Grade 91 steel. Metals, vol. 5, iss. 1, pp. 131–149. https://doi.org/10.3390/met5010131.
  4. Golañski, G. (2010). Effect of the heat treatment on the structure and properties of GX12CrMoVNbN9-1 cast steel. Archives of Materials Science and Engineering, vol. 46, iss. 2, pp. 88–97.
  5. Golañski, G. & Słania, J. (2013). Effect of different heat treatments on microstructure and mechanical properties of the martensitic GX12CrMoVNbN9-1 cast steel. Archives of Metallurgy and Materials, vol. 58, iss. 1, pp. 25–30. https://doi.org/10.2478/v10172-012-0145-x.
  6. Jones, W. B., Hills, C. R., & Polonis, D. H. (1991). Microstructural evolution of modified 9Cr-lMo steel. Metallurgical Transactions A, vol. 22, pp. 1049–1058. https://doi.org/10.1007/BF02661098.
  7. Yoshino, M., Mishima, Y., Toda, Y., Kushima, H., Sawada, K., & Kimura, K. (2008). Influence of normalizing heat treatment on precipitation behavior in modified 9Cr-1Mo steel. Materials at High Temperatures, vol. 25, iss. 3, pp. 149–158. https://doi.org/10.3184/096034008X356349.
  8. Yoshino, M., Mishima, Y., Toda, Y., Kushima, H., Sawada, K., & Kimura, K. (2005). Phase equilibrium between austenite and MX carbonitride in a 9Cr-1Mo-V-Nb steel. ISIJ International, vol. 45, iss. 1, pp. 107–115. https://doi.org/10.2355/isijinternational.45.107.
  9. Hurtado-Noreña, C., Danón, C. A., Luppo, M. I., & Bruzzoni, P. (2015). Evolution of minor phases in a P91 steel normalized and tempered at different temperatures. Procedia Materials Science, vol. 8, pp. 1089–1098. https://doi.org/10.1016/j.mspro.2015.04.172.
  10. Chatterjee, A., Chakrabarti, D., Moitra, A., Mitra, R., & Bhaduri, A. K. (2014). Effect of normalization temperatures on ductile – brittle transition temperature of a modi fi ed 9Cr – 1Mo steel. Materials Science and Engineering: A, vol. 618, pp. 219–231. https://doi.org/10.1016/j.msea.2014.09.021.
  11. Karthikeyan, T., Dash, M. K., Ravikirana, Mythili, R., Selvi, S. P., Moitra, A., & Saroja, S. (2017) Effect of prior-austenite grain refinement on microstructure, mechanical properties and thermal embrittlement of 9Cr-1Mo-0.1C steel. Journal of Nuclear Materials, vol. 494, pp. 260–277. https://doi.org/10.1016/j.jnucmat.2017.07.019.
  12. Karthikeyan, T., Paul, V. T., Saroja, S., Moitra, A., Sasikala, G., & Vijayalakshmi, M. (2011). Grain refinement to improve impact toughness in 9Cr-1Mo steel through a double austenitization treatment. Journal of Nuclear Materials, vol. 419, iss. 1–3, pp. 256–262. https://doi.org/10.1016/j.jnucmat.2011.08.010.
  13. Homolova, V., Janovec, J., Zahumensky, P., & Vyrostkova, A. (2003). Influence of thermal-deformation history on evolution of secondary phases in P91 steel. Materials Science and Engineering: A, vol. 349, pp. 306–312. https://doi.org/10.1016/S0921-5093(02)00768-2.
  14. Kafexhiu, F., Vodopivec, F., & Tuma, J. V. (2012). Effect of tempering on the room-temperature mechanical properties of X20CrMoV121 and P91 steels. Materials and Technologies, vol. 46, iss. 5, pp. 459–464.
  15. Senior, B. A., Noble, F. W., & Eyres, B. L. (1988). The effect of ageing on the ductility of 9Cr-l Mo steel. Acta Metallurgica, vol. 36, iss. 7, pp. 1855–1862. https://doi.org/10.1016/0001-6160(88)90253-2.
  16. Sathyanarayanan, S., Basu, J., Moitra, A., Sasikala, G., & Singh, V. (2013). Effect of thermal aging on ductile-brittle transition temperature of modified 9Cr-1Mo steel evaluated with reference temperature approach under dynamic loading condition. Metallurgical and Materials Transactions A, vol. 44, pp. 2141–2155. https://doi.org/10.1007/s11661-012-1510-0.
  17. Golañski, G. & Kepa, J. (2012). The effect of ageing temperatures on microstructure and mechanical properties of GX12CrMoVNbN9-1 (GP91) cast steel. Archives of Metallurgy and Materials, vol. 57, iss. 2, pp. 575–582. https://doi.org/10.2478/v10172-012-0061-0.
  18. (2014). ASTM A370-14. Standard test methods and definitions for mechanical testing of steel products. ASTM Int. West Conshohocken, PA. https://doi.org/10.1520/A0370-14.2.
  19. Choudhary, B. K., Christopher, J., Palaparti, D. P. R., Samuel, E. I., & Mathew, M. D. (2013). Influence of temperature and post weld heat treatment on tensile stress-strain and work hardening behaviour of modified 9Cr-1Mo steel. Materials & Design, vol. 52, pp. 58–66. https://doi.org/10.1016/j.matdes.2013.05.020.
  20. Panait, C. G., Zielińska-Lipiec, A., Koziel, T., Czyrska-Filemonowicz, A., Gourgues-Lorenzon, A.-F., & Bendick, W. (2010). Evolution of dislocation density, size of subgrains and MX-type precipitates in a P91 steel during creep and during thermal ageing at 600C for more than 100,000h. Materials Science and Engineering: A, vol. 527, iss. 16–17, pp. 4062–4069. https://doi.org/10.1016/j.msea.2010.03.010.
  21. Arivazhagan, B. & Kamaraj, M. (2013). Metal-cored arc welding process for joining of modified 9Cr-1Mo. Journal of Manufacturing Processes, vol. 15, iss. 4, pp. 542–548. https://doi.org/10.1016/j.jmapro.2013.07.001.
  22. Wang, Y., Kannan, R., & Li, L. (2016). Characterization of as-welded microstructure of heat-affected zone in modified 9Cr-1Mo-V-Nb steel weldment. Materials Characterization, vol. 118, pp. 225–234. https://doi.org/10.1016/j.matchar.2016.05.024.
  23. Baltusnikas, A., Levinskas, R., & Lukošiute, I. (2007). Kinetics of carbide formation during ageing of pearlitic 12X1M phi Steel. Materials Science, vol. 13, pp. 286–292.
  24. Hurtado-Noren, C., Danon, C. A., Luppo, M. I., & Bruzzoni, P. (2015). Evolution of minor phases in a 9PctCr steel : Effect of tempering temperature and relation with hydrogen trapping. Metallurgical and Materials Transactions A, vol. 46, pp. 3972–3988. https://doi.org/10.1007/s11661-015-3045-7.
  25. Maruyama, K., Sawada, K., & Koike, J. (2001) Strengthening mechanisms of creep resistant tempered martensitic steel. ISIJ International, vol. 41, iss. 6, pp. 641–653. https://doi.org/10.2355/isijinternational.41.641.
  26. Paul, V. T., Saroja, S., & Vijayalakshmi, M. (2008). Microstructural stability of modified 9Cr–1Mo steel during long term exposures at elevated temperatures. Journal of Nuclear Materials, vol. 378, iss. 3, pp. 273–281. https://doi.org/10.1016/j.jnucmat.2008.06.033.
  27. Yan, W., Wang, W., Shan, Y. Y., & Yang, K. (2013). Microstructural stability of 9-12%Cr ferrite/martensite heat-resistant steels. Frontiers of Materials Science, vol. 7, pp. 1–27. https://doi.org/10.1007/s11706-013-0189-5.
  28. Vodopivec, F., Kmetic, D., Vojvodi-Tuma, J., & Skobir, D. A. (2004). Effect of operating temperature on microstructure and creep resistance of X20CrMoV121 steel. Materiali in Tehnologije, vol. 38, iss. 5, pp. 233–239.
  29. Thakur, S. K. & Dhindaw, B. K. (2001). Influence of interfacial characteristics between SiCp and Mg/Al metal matrix on wear, coefficient of friction and microhardness. Wear, vol. 247, pp. 191–201. https://doi.org/10.1016/S0043-1648(00)00536-6.
  30. Thakur, S. K. & Gupta, M. (2007). Improving mechanical performance of Al by using Ti as reinforcement. Composites Part A: Applied Science and Manufacturing, vol. 38, iss. 3, pp. 1010–1018. https://doi.org/10.1016/j.compositesa.2006.06.014.
  31. Vivas, J., Capdevila, C., Jimenez, J. A., Benito-Alfonso, M., & San-Martin, D. (2017). Effect of ausforming temperature on the microstructure of G91 steel. Metals, vol. 7, iss. 7, pp. 1–11. https://doi.org/10.3390/met7070236.

 

Received 05 May 2022

Published 30 March 2022