Effect of Tempering on Microstructure and Mechanical Properties of Ultra Low Carbon Heavy Steel Plate with Intercritical Quenching

Abstract:

The Effect of tempering on microstructure and mechanical properties of ultra low carbon heavy steel plate with intercritical quenching were studied by utilizing SEM, TEM, tensile and impact tests. Mobile dislocations decreased, plenty of carbides and secondary phase particles precipitated dispersedly in the matrix, and then some dislocations were pinned by these precipitations, which made the YS increase when tempered from 180 to 450 oC. However, the bainite islands, formed after intercritically quenched, were still existed, the boundaries of which were clear but just laths broadening in the interior, so the UTS had a slight variation. With increasing tempering temperature from 450 to 630 oC, carbides became coarse, the bainite islands were gradually polygonized, even the boundary of which became fuzzy, dislocations transferred and formed the cellular sub-grain, which caused synthetically both YS and UTS decreasing evidently, the low temperature toughness gradually increasing, and the mixed fracture of impact specimens converting into ductile fracture.

• Periodical: Advanced Materials Research (Volumes 152-153)
• Pages: 1276-1283
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.152-153.1276
• Online since: October 2010
• Authors: De Hui Zou, Zhi Fang Peng, Ruo Min Wang, Shan Wang
• Keywords: Intercritical Quenching, Mechanical Property, Microstructure, Tempering, Ultra Low Carbon Steel Heavy Plate

References

[1] Akbarpour MH, Ekrami A: Materials Science Engineering A Vol. 475(2008), p.293.

[2] Xuan Liang, Jun Li, Yinghong Peng: Materials Letters Vol. 62(2008), p.327.

[3] Kuang S, Kang Y, Yu H, Liu R: International Journal of Minerals, Metallurgy and Materials Vol. 16 (2009), p.159.

[4] M.H. Saleh，R. Priestner, Journal of Materials Processing Technology Vol. 113 (2001) p.587.

[5] Pijun Zhang, Xianghua Liu and Guodong Wang: Journal of Northeastern University (Natural Science) Vol. 28 (2007), p.57 (In Chinese).

[6] Juanjuan Luo, Wen Shi, Qunfei Huang and Lin Li: Iron and Steel Vol. 43 (2008), p.84 (In Chinese).

[7] Süleyman Gündüz: Materials Letters Vol. 63 (2009), p.2381.

[8] T. Waterschoot, K. Verbeken, B.C. Decooman: ISIJ International Vol. 46(2006), p.138.

[9] Bimal K. Jha, Nirmalendu S. Mishra: Materials Science and Engineering A Vol. 263 (1999), p.42.

[10] Shuang Kuang, Yonglin Kang, Hao Yu, Rendong Liu, Ling Yan: Iron and Steel. Vol. 43 (2008), p.77 (In Chinese).

[11] Junchang Shen, Caifu Yang, Yongquan Zhang: Iron and Steel. Vol. 42(2007), p.63 (In Chinese).

[12] A.K. De, K. De Blauwe，S. Vandeputte, B.C. De Cooman: Journal of Alloys and Compounds. Vol. 310(2000), pp.405-410.

DOI: 10.1016/s0925-8388(00)00973-7

[13] Han Dong: Advanced Steel (Science Press, China 2008) (In Chinese).

[14] Junyan Fu: Iron and Steel. Vol. 40(2005), p.1 (In Chinese).

[15] C. Zhang, D. Caia, B. Liao, T. Zhao, Y. Fan: Materials Characterization Vol. 55 (2005) p.378.

[16] C. Krempaszky, U. Liedla, E.A. Werner: Computational Materials Science Vol. 38 (2006) p.90.

[17] Süleyman Gündüz: Materials Science and Engineering A Vol. 486 (2008) p.71.