U71Mn重轨钢中夹杂物表征
Characterization of inclusions in U71Mn heavy rail steel
非金属夹杂物是重轨钢内部损伤及产生疲劳破坏的主要原因。重轨钢采用无铝脱氧工艺,严格控制尖晶石类脆性夹杂物。本研究取自国内某钢厂常规工艺生产的一炉重轨钢,取中间包、连铸坯和成品钢轨研究钢中非金属夹杂物,基于自动电镜扫描与能谱结合分析了三个阶段夹杂物的形貌、平均成分、数量密度与面积分数的变化,发现Al2O3 夹杂成分变化幅度较大,占比由中间包的 64.81%上升至钢轨中 78.86%;SiO2由 16.80%降低到 2.57%;MnO由 4.65%降…查看全部>>
Non-metallic inclusions are the main cause of internal damage and fatigue failure of heavy rail steel.Heavy rail steel adopts aluminum-free deoxidation process and strictly controls spinel brittle inclusions.In this study,a furnace of heavy rail steel produced by a conventional process in a domestic steel mill was used to study the non-metallic inclusions in the steel from the tundish,continuous casting billet and finished rail.Based on the combination of au…查看全部>>
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