Microstructures and Toughness in Simulated Coarse Grain Heat-Affected Zones of Copper-Bearing Steel

Abstract:

Microstructures and toughness of simulated coarse grain heat-affected zone of hot continuously rolled copper-bearing steel were investigated using physical simulation. The results showed that brittlement is easy to happen in the region of CGHAZ with slower thermal cycles (t8/5≥45s). Granular bainite transformed from austenite led to brittlement. The dimensions of granular martensite and austenite (M-A) constituents are main factors influencing the impact toughness. There is no visible effect on the toughness when the dimensions of M-A constituents are less than 1μ m. However, the toughness decreases greatly once the dimensions exceed 1μ m. Therefore, decreasing the dimensions of M-A constituents by controlling weld heat input will do good to improve the impact toughness of copper-bearing steel.

• Periodical: Materials Science Forum (Volumes 575-578)
• Pages: 910-914
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.575-578.910
• Online since: April 2008
• Authors: Wen Yan Liu, Lai Wang, Ji Bin Liu, Ping He Li, Kai Miao, Rong Dong Han
• Keywords: Coarse Grain Heat-Affected Zone, Copper Bearing Steel, Granular Bainite, MA Constituent

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