Fine grained cemented carbide for turning in heat resistant super alloys (HRSA) and stainless steels
    15.
    发明公开
    Fine grained cemented carbide for turning in heat resistant super alloys (HRSA) and stainless steels 有权
    FeinkörnigesHartmetall zum Wenden vonhitzebeständigenSuperlegierungen und rostfreiem Stahl

    公开(公告)号:EP2008743A1

    公开(公告)日:2008-12-31

    申请号:EP08156057.5

    申请日:2008-05-13

    Abstract: The present invention relates to a cutting insert for turning in heat resistant super alloys and stainless steels comprising a very fine grained hard substrate and a coating. The substrate comprises WC 5-8 wt-% Co and 0.3-1.5 wt-% Cr. Additionally, ppm levels of Ti, Ta, or mixtures of these, are present. The ratio of Me/Co= (at-%Ti+ at-%Nb+at-%Ta)/at-%Co is lower than or equal to 0.014-(CW_Cr)*0.008 and higher than 0.0005. The average sintered WC-grain size is 0.5-0.95 µm and CW_Cr 0.75-0.95. The cemented carbide body is coated with a PVD Ti x Al 1-x N-coating with an average composition of 0.4 1 µm, but
    racterised in that the substrate comprises WC, 5-8 wt% Co, 0.3-1.5 wt% Cr, and ppm levels of Ta, Ti or mixtures thereof, present in such amounts that the ratio
    Me/Co=(at-%Ti+at-%Ta)/at-%Cc is lower than or equal to 0.014-(CW_Cr)*0.008 and higher than 0.0005, and
    CW_Cr is 0.75-0.95, wherein
    CW_Cr= (magnetic-% Co +1.13*wt-% Cr)/wt-% Co,
    wherein magnetic-% Co is the weight percentage of magnetic Co, wt-% Cr is the weight percentage of Cr and wt-% Co is the weight percentage of Co in the cemented carbide, and
    the coating is a PVD Ti x Al 1-x N-coating with an average composition of 0.4 1 µm, but

    Abstract translation: 本发明涉及用于转动耐热超合金的切削刀片和包含非常细晶粒的硬质基底和涂层的不锈钢。 基体包括WC 5-8wt%Co和0.3-1.5wt%Cr。 此外,存在ppm水平的Ti,Ta或它们的混合物。 Me / Co =(at-%Ti + at-%Nb + at-%Ta)/ at-%Co的比例低于或等于0.014-(CW_Cr)* 0.008且高于0.0005。 平均烧结WC晶粒尺寸为0.5-0.95μm,CW_Cr为0.75-0.95。 硬质合金体涂覆有平均组成为0.4 1μm,但<6.0μm。 其特征在于,底物包含WC,5-8重量%Co,0.3-1.5重量%Cr和ppm水平的Ta,Ti或其混合物,其量以使Me / Co =(原子%Ti + at-%Ta)/ at-%Cc低于或等于0.014-(CW_Cr)* 0.008且高于0.0005,CW_Cr为0.75-0.95,其中CW_Cr =(磁 - %Co + 1.13 * wt-%Cr )/ wt-%Co,其中磁性%Co是磁性Co的重量百分比,wt-%Cr是Cr的重量百分比,wt-%Co是硬质合金中Co的重量百分比,涂层是 平均组成为0.4 1μm,但<6.0μm。

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