论文部分内容阅读
研究电渣重熔过程冷却强度对含镁H13钢凝固组织和碳化物偏析的影响.采用光学显微镜、扫描电镜、透射电镜、X射线衍射仪等分析凝固组织及碳化物的特征.研究发现,钢锭的凝固组织均为马氏体组织、残余奥氏体及一次碳化物.H13钢电渣锭中主要析出的一次碳化物为V8C7、MC、M23C6及M6C.随着冷却强度增加,电渣锭边部碳化物的尺寸减小且分布更加均匀,但是碳化物的类型不发生变化.电渣重熔过程中冷却强度增加促进钢中镁对夹杂物的变性能力,经过镁变性后生成的Mg O·Al2O3为Ti N的析出提供形核质点,Mg O·Al2O3和Ti N的复合夹杂物能够促进一次碳化物异质形核,从而细化一次碳化物.
The effects of cooling strength during ESR process on solidification structure and carbide segregation of H13 steel containing Mg were studied.The characteristics of solidified structure and carbide were analyzed by optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffraction, Of the solidified tissue are martensite, retained austenite and primary carbides.H13 steel electroslag ingot primary precipitated carbide is V8C7, MC, M23C6 and M6C.With the increase in cooling strength, ESR ingot The size and size distribution of carbides are more uniform, but the types of carbides do not change.The increase of cooling strength in the process of electroslag remelting can promote the denaturation of magnesium in steel, and MgO · Al2O3 provides nucleation sites for the precipitation of TiN. The composite inclusions of MgO · Al2O3 and TiN promote the heterogeneous nucleation of primary carbides and refine the primary carbides.