Acicular ferrite formation during isothermal holding in HSLA steel
Source abstract
Abstract
Microstructural observation and high-resolution dilatometry were employed to investigate acicular ferrite formation during isothermal holding in the HSLA steel. A decrease in isothermal temperature suppresses formation of polygonal ferrite and promotes formation of acicular ferrite. Island-like martensite/austenite constituents are dispersed inside of the acicular ferrite grain. The displacive model assuming autocatalytic nucleation was developed to describe the incomplete transformation phenomenon well. Decrease of isothermal temperature lowers the activation energy, and thus enhances the formation of acicular ferrite. Increase of amount of polygonal ferrite and acicular ferrite both results in decrease of M s. Formation of polygonal ferrite causes diffusion of solute alloying atoms into the untransformed austenite, which lowers M s. Acicular ferrite transformation suppresses martensitic transformation by diffusion of solution atoms during isothermal holding, and introduction of internal stress resulting from volume expansion during FCC → BCC transformation.
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Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metal Alloys Wear and Properties · Metallurgy and Material Forming
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (34)
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1. Jun HJ, Kang J, Seo D, Kang K, Park C (2006) Effects of deformation and boron on microstructure and continuous cooling transformation in low carbon HSLA steels. Mater Sci Eng A 422:157–16210.1016/j.msea.2005.05.008 ↗
2. Rodrigues P, Pereloma E, Santos D (2000) Mechanical properities of an HSLA bainitic steel subjected to controlled rolling with accelerated cooling. Mater Sci Eng A 283:136–14310.1016/S0921-5093(99)00795-9 ↗
3. Wang C, Wu X, Xu N, Liu J (2006) Transmission electron microscopy of martensite/austenite islands in pipeline steel X70. Mater Sci Eng A 438–440:267–27110.1016/j.msea.2006.02.118 ↗
4. Zhao M-C, Yang K, Xiao F-R, Shan Y-Y (2003) Continuous cooling transformation of undeformed and deformed low carbon pipeline steels. Mater Sci Eng A 355:126–13610.1016/S0921-5093(03)00074-1 ↗
5. Xiao F-R, Liao B, Shan Y-Y, Qiao G-Y, Zhong Y, Zhang C et al (2006) Challenge of mechanical properties of an acicular ferrite pipeline steel. Mater Sci Eng A 431:41–5210.1016/j.msea.2006.05.029 ↗
6. Ricks R, Howell P, Barritte G (1982) The nature of acicular ferrite in HSLA steel weld metals. J Mater Sci 17:732–740. doi: 10.1007/BF0054036910.1007/BF00540369 ↗
7. Zhao YT, Shang CJ, Yang SW, Wang XM, He XL (2006) The metastable austenite transformation in Mo–Nb–Cu–B low carbon steel. Mater Sci Eng A 433:169–17410.1016/j.msea.2006.06.048 ↗
8. Kim YM, Lee H, Kim NJ (2008) Transformation behavior and microstructural characteristics of acicular ferrite in linepipe steels. Mater Sci Eng A 478:361–37010.1016/j.msea.2007.06.035 ↗
9. Díaz-Fuentes M, Gutiérrez I (2003) Analysis of different acicular ferrite microstructures generated in a medium-carbon molybdenum steel. Mater Sci Eng A 363:316–32410.1016/S0921-5093(03)00665-8 ↗
10. Wang J, Van der Wolk P, Van der Zwaag S (2000) On the influence of alloying elements on the bainite reaction in low alloy steels during continuous cooling. J Mater Sci 35:4393–4404. doi: 10.1023/A:100486520911610.1023/A:1004865209116 ↗
11. Wang W, Yan W, Zhu L, Hu P, Shan Y, Yang K (2009) Relation among rolling parameters, microstructures and mechanical properties in an acicular ferrite pipeline steel. Mater Des 30:3436–344310.1016/j.matdes.2009.03.026 ↗
12. Bhadeshia H, Christian J (1990) Bainite in steels. Metall Trans A 21:767–79710.1007/BF02656561 ↗
13. Mittemeijer EJ (2010) Fundamentals of materials science. Springer, Heidelberg
14. Shi L, Yan Z-S, Liu YC, Yang X, Zhang C, Li HJ (2014) Effect of acicular ferrite on banded structures in low-carbon microalloyed steel. Int J Miner Metall Mater 21:1167–117410.1007/s12613-014-1024-4 ↗
15. Shi L, Yan ZS, Liu YC, Yang X, Qiao ZQ, Ning BQ, Li HJ (2014) Development of ferrite/bainite bands and study of bainite transformation retardation in HSLA steel during continuous cooling. Met Mater Int 20:19–2510.1007/s12540-014-1006-0 ↗
16. Chen H, Zhu K, Zhao L, van der Zwaag S (2013) Analysis of transformation stasis during the isothermal bainitic ferrite formation in Fe–C–Mn and Fe–C–Mn–Si alloys. Acta Mater 61:5458–546810.1016/j.actamat.2013.05.034 ↗
17. Chen H, Borgenstam A, Odqvist J, Zuazo I, Agren J, van der Zwaag S (2013) Application of interrupted cooling experiments to study the mechanism of bainitic ferrite formation in steels. Acta Mater 61:4512–452310.1016/j.actamat.2013.04.020 ↗
18. Mishra SK, Das S, Ranganathan S (2002) Precipitation in high strength low alloy (HSLA) steel: a TEM study. Mater Sci Eng A 323:285–29210.1016/S0921-5093(01)01382-X ↗
19. Babu SS (2004) The mechanism of acicular ferrite in weld deposits. Curr Opin Solid State Mater Sci 8:267–27810.1016/j.cossms.2004.10.001 ↗
20. Ohmori Y, Maki T (1991) Bainitic transformation in view of displacive mechanism. Mater Trans JIM 32:631–64110.2320/matertrans1989.32.631 ↗
21. Takahashi M (2004) Recent progress: kinetics of the bainite transformation in steels. Curr Opin Solid State Mater Sci 8:213–21710.1016/j.cossms.2004.08.003 ↗
22. Rees G, Bhadeshia H (1992) Bainite transformation kinetics part 2 non-uniform distribution of carbon. Mater Sci Technol 8:994–100310.1179/mst.1992.8.11.994 ↗
23. Quidort D, Brechet Y (2001) Isothermal growth kinetics of bainite in 0.5% C steels. Acta Mater 49:4161–417010.1016/S1359-6454(01)00316-0 ↗
24. Koistinen D, Marburger R (1959) A general equation prescribing the extent of the austenite-martensite transformation in pure iron-carbon alloys and plain carbon steels. Acta Metall 7:59–6010.1016/0001-6160(59)90170-1 ↗
25. Van Bohemen SM, Sietsma J (2008) Modeling of isothermal bainite formation based on the nucleation kinetics. Int J Mater Res 99:739–74710.3139/146.101695 ↗
26. Liu C, Liu Y, Zhang D, Gao Z, Yan Z (2013) Bainite formation kinetics during isothermal holding in modified high Cr ferritic steel. Metall Mater Trans A. 44:5447–545510.1007/s11661-013-1884-7 ↗
27. Pati S, Cohen M (1969) Nucleation of the isothermal martensitic transformation. Acta Metall 17:189–19910.1016/0001-6160(69)90058-3 ↗
28. Sidhu G, Bhole S, Chen D, Essadiqi E (2011) An improved model for bainite formation at isothermal temperatures. Scr Mater 64:73–7610.1016/j.scriptamat.2010.09.009 ↗
29. Van Bohemen S (2010) Modeling start curves of bainite formation. Metall Mater Trans A. 41:285–29610.1007/s11661-009-0106-9 ↗
30. Bhadeshia H (1981) Driving force for martensitic transformation in steels. Metal Sci 15:175–17710.1179/030634581790426714 ↗
31. Chester N, Bhadeshia H (1997) Mathematical modelling of bainite transformation kinetics. J Phys IV 7:C541–C546
32. Van Bohemen SMC (2012) Bainite and martensite start temperature calculated with exponential carbon dependence. Mater Sci Technol 28:487–49510.1179/1743284711Y.0000000097 ↗
33. Andrews K (1965) Empirical formulae for the calculation of some transformation temperatures. J Iron Steel Inst. 203:721–727
34. Patel J, Cohen M (1953) Criterion for the action of applied stress in the martensitic transformation. Acta Metall 1:531–53810.1016/0001-6160(53)90083-2 ↗