42CrMoV緊固件用鋼顯微組織及夾雜物的分析

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Analysis research on microstructure and inclusions of 42CrMoV bolt

1. Scott Special Steel Company, Masteel Co. Ltd., Ma'anshan 243001, China;
2. School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243002, China;
3. School of Material Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China;
4. Special Steel Company, Masteel Co. Ltd., Ma'anshan 243001, China

摘要: 采用掃描電鏡、掃描透射電子顯微鏡暗場成像、ASPEX軟件等研究分析42CrMoV緊固件顯微組織及夾雜物.42Cr MoV緊固件基體組織為回火索氏體,基體組織仍保留著原來馬氏體的形態,碳化物成排地在晶內和板條邊界析出,并且晶界明顯多于晶內析出;顯微硬度HV0.2為330,奧氏體晶粒度(等級)為9級;夾雜物主要類型為MnS夾雜以及與MnS和CAS有關的復合夾雜物,主要夾雜物尺寸小于5μm,A、B、C、D和Ds夾雜物的等級基本都小于等于0.5級.
- 高強度緊固件 /
- 顯微組織 /
- 晶粒度 /
- 夾雜物
Abstract: The microscopic structures and inclusion in 42CrMoV bolt were investigated by SEM,STEM and software ASPEX. The results show that the matrix structure of 42CrMoV bolt is tempered sorbite,but still retains the original morphology of martensite. Carbides precipitate and arrange orderly in intracrystalline and lath boundaries,and the amount of precipitated carbides in grain boundaries are more than that in intracrystalline. Besides,the micro-hardness HV0.2 is 330 and the grain size(level) of austenitic is 9. The Mn S and aluminate are the main inclusion types in 42CrMoV bolt,and the size of inclusions are mostly less than 5 μm,the level of A,B,C,D and Ds inclusion was basically less than or equal to Level 0.5.
- high strength bolt /
- microscopic structure /
- grain size /
- inclusion