In Situ Observation on Fracture Behavior of 800MPa Grade Dual-Phase Steel

Abstract:

The tensile process of 800MPa grade dual-phase steel was observed in-situ by SEM. The initiation and propagation of crack in dual-phase steel, the initiation of micro-pores, the deformation behavior of ferrite and martensite were analyzed in this paper. The results show that the main crack goes across the soft ferrite and around the hard martensite during its propagation in the beginning. When the applied stress is small, the micro-pores are easy to form inside the ferrite grain or on the interface of ferrite and martensite. The micro-pores can also form in the fracture site of martensite with the increase of applied stress. The fracture morphology of the dual-phase steel is dimple and the formation of fracture belongs to plastic fracture.

• Periodical: Advanced Materials Research (Volumes 299-300)
• Pages: 385-389
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.299-300.385
• Online since: July 2011
• Authors: Guang Can Jin, Shu Ying Chen, Mei Zhao, Qing Chun Li, Xu Dong Yue, Guo Wei Chang
• Keywords: Crack, Dual Phase Steel, Micro-Pore, Plastic Fracture

References

[1] Su K, Yu J X, Xu J B: Iron Steel Vanadium Titanium Vol. 27 (2006), p.53.

[2] Ma M T, Wu B R: Dual Phase Steel-Physics and Mechanical metallurgy [M]. (Metallurgical Industry Press T, Beijing 2009).

[3] Kang Y L, Kuang S, Yin X D, et al: Automobile Technology & Material (2006), p.1.

[4] Ma M T, Shi M F: Iron & Steel Vol. 39 (2004), p.68.

[5] Jiao S J, Zhang H, Zheng J: Baosteel Technology Vol. 5 (2003), p.43.

[6] N. Peranio, Y.J. Li, F. Roters, D. Raabe: Materials Science and Engineering A Vol. 527 (2010), p.4161.

[7] Dong yi, Shi xiaoguang, Han bin, et al. Journal of Plasticity Engineering Vol. 18 (2011), p.81.

[8] ZUO Xiu-rong, CHEN Yun-bo, WANG Miao-hui, et al: Transactions of Materials and Heat Treatment Vol. 31 (2010), p.29.

[9] Su Y, Fu R Y, Li L, et al: Journal of Shanghai University (Natural Science Edition) Vol. 12 (2006), p.423.