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Main parameters of Cemented Carbide

Main parameters of Cemented Carbide

Susie originaity 2022-10-24 14:16:15

                       Main parameters of Cemented Carbide


●硬度 Hardness
材料局部抵抗硬物压入其表面的能力称为硬度,主要采用洛氏或维氏硬度测量法,两种硬度值转换时需要注意换算。
The ability of the material to locally resist hard objects pressed into its surface is called hardness,mainly using Rockwell or Vickers hardness measurement method,two kinds of hardness value conversion need to pay attention to conversion.

●矫顽磁力 Coercive Field Strength
矫顽磁力测量的是合金试样完全去磁化所需的反向磁场大小,它可用来评定合金的组织状况,矫顽力随钴含量降低而增大,当钴含量一定时,碳化钨晶粒越细,钴相分散程度越高,矫顽力也越大。
Coercive Field Strength is a measure of the residual magnetism in the hysteresis loop when the Cobalt (Co) binder in grade of cemented carbide is magnetized and then demagnetized. It can be used to assess the status of alloy organization. The finer the grain size of the carbide phase the higher will be the coercive force value.

●磁饱和 Magnetic Saturation
磁饱和是最大磁化强度与质量的比值,通过测定硬质合金中具有磁性的钴(Co)粘结相的磁饱和,可以评定合金组份。低磁饱和值表示合金含碳量低,或者含有 η 相碳化物,高磁饱和值表示存在“游离碳或石墨”。
Magnetic Saturation:is the ratio of magnetic intensity to quality. Magnetic Saturation measurements on the Cobalt (Co)binder phase in cemented carbide are used by the industry to evaluate its composition. Low Magnetic Saturation values indicate a low carbon level and/or the presence of Eta-Phase Carbides. High Magnetic Saturation values indicate the presence of“free-carbon”.

●密度 Density
材料的密度(比重)是材料质量与其体积的比率,使用液体置换法进行测定,硬质合金密度随 WC-Co 相中钴含量增加而减小。
The Density (specific gravity) of a material is the ratio of its mass to its volume. It is measured using a water displacement technique. Cemented carbide density decreases linearly with increasing Cobalt content for the Wc-Co grades.

●抗弯强度 Transverse Rupture Strength
抗弯强度是表征材料抵抗弯曲不断裂的能力,即试样跨距中点加载负荷至断裂时,单位面积上所受的力大小。
Transverse Rupture Strength(TRS) is the ability of material to resist bending,measured at t he breaking point of amaterial in a standard three point bend test.

●断裂韧性 Fracture toughness
当材料曝露在外部应力时(静态或动态),这会导致力学张力的出现。断裂韧性表征材料阻止裂纹扩展的能力,也就是材料抵抗破碎和断裂的能力,通常用 KIC 表示。
When materials are exposed to external stresses(static or dynamic), this results in the appearance of mechanical tension.
Fracture toughness characterizes the ability of a material to prevent crack propagation,that is, the ability of a material to resist breakage and fracture, and is usually expressed as KIC.

●金相 Metallographic Analysis
硬质合金烧结钴相粘结后,过量钴可能在某些结构区域中存在,形成“钴池”;而当粘结相不完全粘结,则将形成一些少量残余孔隙,合金中钴池及孔隙率使用金相显微镜检验得到。
Cobalt Lakes will bond after sintering, excess cobalt may exist in certain area of the structure, forming the cobalt pool; If bonding phase is incompletely adhesive, there will form some residual pores. Cobalt pools and porosity can be detected by using metallographic microscope.