The Effect of Bainitic Transformation Microstructure under Applied Stress on Corrosion Resistance of HQ785 Steel

Abstract:

In this thesis, based on the low-carbon bainitic steel HQ785, isothermal transformation tests are carried out on the Gleeble-3500 thermo-mechanical simulator under uniaxial external tensile stress state. The fully immersed accelerated corrosion tests for the specimens, with different microstructure after phase transformation are carried out. The corrosion behavior of experimental steel is evaluated, combing with OM, SEM, weight loss method and electrochemical method. The results show that the shape of phase transformation microstructrue varies from granular to lath with the increase of external tensile stress. The corrosion resistance of which is better than that of granular bainite without stress. The sample with rusty layer after full immersion seawater corrosion shows good protectiveness.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 1591-1596
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.1591
• Online since: May 2011
• Authors: Yu Hong Wang, Wei Juan Li, Lan Jin
• Keywords: Applied Tensile Stress, Corrosion Resistance, Hq785 Steel, Microstructure

References

[1] T.FURUHARA, H.KAWATA and S.MORITO: Metallurgical and Materials Transactions A. Vol. 39(2008), p.1003~1012

[2] Jia Guo, Shanwu Yang, Chengjia Shang, etal: Iron and Steel. Vol. 43(2008), p.58~62. In Chinese

[3] Jie Dong, Wenfang Cui, Sixun Zhang, etal: Journal of Northeastern University(Natural Science).Vol. 28(2007), p.1293~1296. In Chinese

[4] A Di Schino, J M Kenny: Journal of Materials Science Letters. Vol.21(2002), p.1631~1634

[5] Melchers R E: Corrosion. Vol. 59 (2003), p.319 ~334

[6] Zongchang Liu, Huiping Ren: Diffusion phase transformation of undercooled austenite (Science Press, China 2007)

[7] 《Color Metallography Technique》writing Group: Color Metallography Technique,National (Defence Industry Press, China 1991)

[8] Yuqing Weng : The Collection of Microstructural Morphology of Steels(Metallurgical Industry Press, China 2009)

[9] Fengping Wang, Wanli Kang, Heming Jing, etal: Corrosion Electrochemistry Principles, Methods and Applications(Chemical Industry Press, China 2008)