夏比冲击试验
针状铁素体
材料科学
韧性
冶金
焊接
热影响区
微观结构
针状的
复合材料
贝氏体
马氏体
出处
期刊:钢铁研究学报(英文版)
日期:2011-01-01
摘要
Excellent Heat Affected Zone Toughness Technology Improved by use of Strong Deoxidizers (ETISD Technology) has been developed by Baosteel. When deoxidation of molten steel is conducted at the precisely controlled oxygen concentrations, the formation of the micro-meter inclusions and the nano-meter precipitates in the steel plate can be effectively controlled. During the welding process with high-heat input, the formation of acicular ferrite can be selectively promoted with the aid of micro-meter inclusions; the growth of γ grain can also be selectively restrained by the pinning effect of nano-meter precipitates. After welding with high-heat input of 400 kJ/cm, excellent heat affected zone toughness can be obtained for the steel plates with both of the above microstructures, and the average absorbed energy is greater than 200 J for V notch Charpy impact test at -20℃ .
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