Hot Ductility Behavior of 9SiCr Alloy Tool Steel by Thin Slab Casting

Abstract:

In order to evaluate the feasibility of 9SiCr alloy tool steel produced by thin slab casting, the high temperature mechanical properties of 9SiCr alloy tool steel were investigated by Gleeb-1500 thermal simulator. The morphologies of the tensile fracture at different temperatures were observed by scanning electron microscope (SEM), together with analysis of fracture mechanisms in different regions. The results showed that there were two brittle zones in the temperature range from 600 °C to 1200 °C. A melting fracture was characterized in the high temperature brittle zone of above 1170 °C, whereas a typical cleavage fracture was exhibited in the low temperature brittle zone from 820 °C to 600 °C, Meanwhile, a good hot ductility behavior characterized by typical dimple fracture was demonstrate at the temperature range from 1170 °C to 820 °C.Thus, the 9SiCr alloy tool steel with the final gauge of 1.5mm was produced by CSP, based on the optimal process parameters.

• Periodical: Materials Science Forum (Volume 944)
• Pages: 259-264
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.259
• Online since: January 2019
• Authors: Wan Jun Zhu*, Chun Feng Wang, Jiang Hua Qi, Yi Qang Sun, Cai Zhen, Chen Qiu
• Keywords: 9SiCr Alloy Tool Steel, Fracture Mechanism, Hot Ductility, Thin Slab Casting

References

[1] X. P. Mao, Q. L. Chen, C. Y. LI. Manufacturing Technique of High-Medium Carbon Steel for Thin Slab Casting and Direct Rolling Process, Iron and Steel. 4 (2012) 93-97.

[2] X. P. Mao. Microalloying Technology in Thin Slab Casting and Rolling Process, Metallurgical Industry Press, Bejing, (2008).

[3] G. H. Jiao, C. Q. Zhou, L.Z. Zhang, et al, Practice on High Carbon High Strength Steel Strip Produced by Compact Strip Production, Word Metals. 1937 (2009) 1.

[4] J. Kong, H. F. Xu. Application Research on A New Heat Treatment Process of 9SiCr Die Steel, Hot Working Technology. 16 (2003) 196-198.

[5] Q. Fang, G. Chen, S. W. Wan, et al. Effect of Austempering Heat Treatment on Microstruture and Mechanical Properties of 9SiCr Steel, Foundry Technology. 7 (2017) 1588-1590.

[6] D. S. Lan, Y. R. Zhou. Study on the Relationship between the Factors of Casting Process and the Slab Surface Quality of 9SiCr Steel, Jiangxi Metallurgy. 2 (1982) 78-81.

[7] M. Q. Hu, M. S. Hu. Study on High Temperature Ductility of Continuously Cast Slab, Iron and Steel. 3 (2008) 38-40.

[8] R. C. Li, T. M. Li, D. H. Lu, et al. Influence of the content of steel on high - temperature mechanical property of steel and longitudinal surface cracks of CSP slab, Continuous Casting. 5 (2005) 24-26.

[9] Z. Z. Wang. Analysis of Internal Cracking during Straightening Continuously Cast Steel Slab with Liquid Core, Journal of Iron and Steel Research, 2 (1990) 9-13.

[10] H.Suzuki, N. Satoshi, N. Yasushi. Improvement of Hot Ductility of Continuously Cast Carbon Steels, ISIJ International. 55 (1984) 54-59.

DOI: 10.2355/isijinternational1966.24.54

[11] B. Mintz, Z. Mohamed, R. Abushosha. Influence of Calcium on Hot Ductility of Steels, Material science & Technology. 7 (1989) 682-688.

DOI: 10.1179/mst.1989.5.7.682

[12] B. Mintz, R. Abu-Shosha, M. Shaker. Influence of Deformation Induced Ferrite, Grain Boundary Sliding, and Dynamic Recrystallization on Hot Ductility of 0.1-0.75%C Steels, Materials Science & Technology. 10 (1993) 907-914.

DOI: 10.1179/mst.1993.9.10.907

[13] K. K. Cai, Z. J. Dang, Y. Zhang, et al, High Temperature Mechanical Properties of Continuously cast blooms, Journal of University of Science and Technology Beijing. Suppl. (1993) 69.

[14] D. Q. Luo, F. M. Xie, Z. G. Wang, et al. Hot Ductility Behavior of High-quality 51CrV4 Spring Steels, Materials Review. 12 (2016) 90-94.

[15] C. Su, F. Dong. High Temperature Plasticity of Micro-Alloyed Q345B in Slab Continuous Casting Process, Iron and Steel. 8 (2012) 65-69.