利用扫描电镜和能谱分析等检测手段研究了“真空感应+真空自耗重熔”和“电弧炉+VOD+真空自耗重熔”两种工艺冶炼的G50超高强度钢中夹杂物形态和尺寸分布。研究结果表明: “真空感应+真空自耗重熔” 冶炼的钢中硫化物夹杂物尺寸较小、平均间距较小，纵横比较大，尤其是细夹杂物较多，相应的细夹杂物密集区域较多，而“电弧炉+VOD+真空自耗重熔”冶炼的钢中MnS夹杂物均匀弥散分布，复合夹杂物中Ca含量较高，MnS变形困难，纵横比较小，导致夹杂物尺寸与平均间距较大。
The morphology and size distribution of inclusions in G50 steel produced by different metallurgy processes were analyzed by SEM, EDAX. Results indicated that in the G50 produced by VIM+VAR the size of MnS inclusions was slightly smaller and their aspect ratio,mean spacing were distinctly larger.There were much more fine inclusions concentrated locally. Size distribution and morphology of MnS in G50 produced by VIM +VAR were dispersed evenly due to higher calcium content in composite MnS inclusions, leading to poor deformability.
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