Effect of Welding Heat Circulation on the Microstructure and Mechanical Properties of 500MPa Ultra Fine Grained Steel in HAZ

Abstract:

Focusing on the need of actual production, physical analogue experiments were done on the 400MPa ultra fine grained steel under different welding heat circulations. The experiment results showed that grains growing up and performance dropping was inevitable, the coarsening temperature range was 1000~1200 ; where the heating temperature was 800 in the Heat Affected Zone, the soften was the most obvious, but when the cooling rate t_8/5<10s, the soften disappeared; speeding up the cooling rate could improve the microstructure of the Heat-affected Zone effectively and made the mechanical properties of the joint better than that of the base metal.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 3377-3382
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.3377
• Online since: February 2011
• Authors: Hong Yun Zhao, Bo Chen, Li Zhou, Guo Dong Wang
• Keywords: Physical Analogue, Softening, Ultra-Fine Grained Steel, Welding Heat Circulation

References

[1] Z. Qu, Z. Tian, C. He, X. Zhang, B. Yang, et al.: Iron and steel Vol. 35(2000), p.70.

[2] H. Dong: China metallugy (2003), p.26.

[3] J. Zrnik, I. Mamuzic, and S. V. Dobatkin: Metalurgija Vol. 45(2006), p.323.

[4] Z. Tian, C. He, X. Zhang, G. Zou, and Z. Qu: Transactions of the China Welding Institution Vol. 22(2004), p.1.

[5] D. Chen, Computer Simulation of Austenite Grain Growth in HAZ of Ultra-Fine Grain Steel. 2002, Beijing university of technology: Beijing.

[6] H. Zhao, G. Wang, X. Liu, and L. Du: Heat Treatment of Metals Vol. 30(2005), p.41.