CAJ | 학술논문

采用氮气雾化法制备 T15M 高速钢粉末，分析4个不同粒度段(100~150、60~100、38~60及≤38μm)粉末的氧、氮含量，用扫描电镜(SEM)观察粉末的表面形貌和内部组织，通过X射线衍射(XRD)和小角X射线散射(SAXS)对化学分离出的碳化物进行物相分析和粒度分析。结果表明，所制备的T15M高速钢粉末呈球形，气体含量低，表面相对光滑。不同粒级粉末的氧含量均在10-4以下，氮含量在4×10-4左右，随粒径减小，氧氮含量略有升高。粉末截面组织主要为枝晶组织，150μm以下粒径的粉末中未发现莱氏体共晶相。粉末基体为体心立方相和残余奥氏体，有少量的MC型和M2C型碳化物。从粉末中萃取的碳化物的中位径在100 nm左右，随粉末粒径减小而略微减小。
채용담기무화법제비 T15M 고속강분말，분석4개불동립도단(100~150、60~100、38~60급≤38μm)분말적양、담함량，용소묘전경(SEM)관찰분말적표면형모화내부조직，통과X사선연사(XRD)화소각X사선산사(SAXS)대화학분리출적탄화물진행물상분석화립도분석。결과표명，소제비적T15M고속강분말정구형，기체함량저，표면상대광활。불동립급분말적양함량균재10-4이하，담함량재4×10-4좌우，수립경감소，양담함량략유승고。분말절면조직주요위지정조직，150μm이하립경적분말중미발현래씨체공정상。분말기체위체심립방상화잔여오씨체，유소량적MC형화M2C형탄화물。종분말중췌취적탄화물적중위경재100 nm좌우，수분말립경감소이략미감소。
The microstructure and constitution of T15M high speed steel powder processed from nitrogen-atomization have been characterized. For the atomized powder, four particle size ranges (100 to 150, 60 to 100, 38 to 60, and<38μm) were examined by means of chemical analysis, scanning electron microscopy, X-ray diffraction and small-angle X-ray scattering (SAXS). The particles are spherical in shape with low gas contents and relatively smooth surfaces. The ledeburite gradually diminishes with decreasing particle size. The matrix of the powders is a mix of a body-centered cubic (bcc) phase and retained austenite. A few MC and M2C carbides are present. The median size of carbides is about 100nm, and decreases with decreasing particle size.