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为了提高厚板经400kJ/cm大线能量焊接后热影响区的低温韧性,在热力学计算的基础上,研究了铝脱氧、钙脱氧和镁脱氧3种脱氧工艺对夹杂物的影响。利用夹杂物自动分析仪对夹杂物进行分析后发现,铝脱氧工艺析出的夹杂物尺寸大、数量少,且主要为Al_2O_3和Al_2O_3+CaO的复合夹杂物;钙脱氧工艺析出夹杂物的主要类型为3μm以下小尺寸的表面包裹MnS铝酸钙夹杂。镁脱氧工艺生成了大量1μm左右弥散分布的MgO和以MgO为核心的表面有TiN和MnS析出的夹杂物。利用钙脱氧和镁脱氧工艺生产的钢板经过400kJ/cm大线能量焊接热模拟后热影响区的-20℃冲击功都在180J以上。
In order to improve the low temperature toughness of heat affected zone (HAZ) after 400kJ / cm large wire welding, the effects of three kinds of deoxidation processes, including aluminum deoxidation, calcium deoxidation and magnesium deoxidation, on inclusions were studied on the basis of thermodynamic calculation. The analysis of inclusions by the inclusion autoanalyzer showed that the size of the inclusions precipitated by the aluminum deoxidation process is large and the number is small, and the main inclusions are inclusions of Al 2 O 3 and Al 2 O 3 + CaO. The main types of CaO deoxidation inclusions are Small size below 3μm surface inclusions MnS calcium aluminate inclusions. Magnesium deoxidation process produces a large number of MgO dispersed around 1μm and MgO as the core surface with TiN and MnS precipitation inclusions. The heat-affected zone at -20 ℃ of the heat-affected zone of the steel plate produced by the calcium deoxidation and magnesium deoxidation process is more than 180J after being subjected to the large-energy energy of 400kJ / cm.