论文部分内容阅读
采用扫描电镜、扫描透射电子显微镜暗场成像、ASPEX软件等研究分析42CrMoV紧固件显微组织及夹杂物.42Cr MoV紧固件基体组织为回火索氏体,基体组织仍保留着原来马氏体的形态,碳化物成排地在晶内和板条边界析出,并且晶界明显多于晶内析出;显微硬度HV0.2为330,奥氏体晶粒度(等级)为9级;夹杂物主要类型为Mn S夹杂以及与MnS和CAS有关的复合夹杂物,主要夹杂物尺寸小于5μm,A、B、C、D和Ds夹杂物的等级基本都小于等于0.5级.
The microstructure and inclusions of 42CrMoV fasteners were analyzed by scanning electron microscopy, scanning transmission electron microscope dark field imaging and ASPEX software, etc. The matrix structure of 42Cr MoV fasteners was tempered sorbite, the matrix still retained the original Markov The morphology of the carbides is that the carbides are precipitated in the intercrystalline and slab boundaries in rows and the grain boundaries are precipitated more obviously than the intergranular precipitates. The microhardness HV0.2 is 330 and the austenite grain size (grade) is 9. The main types of inclusions are MnS inclusions and composite inclusions related to MnS and CAS. The main inclusions are less than 5μm in size, and the inclusions of A, B, C, D and Ds are all less than or equal to 0.5.