Research on Hot Ductility Behavior of 800 MPa Grade Ultra High Strength Weathering Steel

Abstract:

The hot ductility behavior of test steel was investigated by Gleeble-3500 thermo-mechanical simulator through high temperature tensile test. The reduction in area (RA) and tensile strength (TS) were acquired to draw hot ductility curve and hot strength curve. SEM fractograph and microstructure of the tensile samples were analyzed. The results show that the third brittle zone of test steel is between 700°C and 800°C and the occurrence of the third brittle zone is mainly related to the formation of film-like ferrite along the prior austenite grain boundary and the precipitation of second phase. Moreover, the drop of hot ductility at 900°C is rooted in the reduction of grain boundary strength owing to the precipitation of sulfides. Therefore, it is advised that the straightening temperature of test steel should be kept over 900°C.

• Periodical: Advanced Materials Research (Volume 815)
• Pages: 205-211
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.815.205
• Online since: October 2013
• Authors: Chao Bin Huang, Yan Zhu, Ru Yi Wu, Qing Shan Li, Mei Zhang, Yong Zhong, Lin Li
• Keywords: 800MPa Grade High Strength Steel, Brittle Zone, Continuous Casting Slabs, Hot Ductility

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