表观硬度

结果表明，添加少量铬的Fe-Ni-Mo-Cu预合金粉末，在1120℃下烧结，可获得较高的烧结密度；微观组织硬度随铬量的增加而增加，表观硬度随密度的增加而增加。

Results show that higher sintered density can be obtained for Fe-Ni-Mo-Cu prealloyed powder with lower Cr addition at 1120 ℃, and the microhardness increases with the addition of Cr and apparent hardness increases with increasing sintered density .

表观硬度增加约50%；

Their apparent hardness HRB increased by about 50 % ;

表观硬度最高可达44HRC，抗拉强度为1434MPa。

Apparent hardness could be 44 HRC and tensile strength could be 1 434 MPa .

元素在界面两侧的扩散是影响材料显微组织、表观硬度及界面结合强度的关键。

The interfacial diffusion of alloying element is an important factor to microstructure , apparent hardness and interfacial bond strength .

摩擦材料的表观硬度主要取决于基体组元，摩擦组元的显微硬度对其影响不大。

The microhardness of friction materials mainly depends on matrix components and by no means the microhardness of friction component , of which the effect is limited .

随添加的铬量和复烧温度的提高，微观组织硬度和表观硬度逐渐增加，经热锻及热锻复烧可获得较高的烧结密度和硬度。

Microhardness and apparent hardness increase with increasing amount of chromium addition and re-sintering temperature , and higher density and hardness can be obtained after hot-forging sintering and re-sintering .

结果表明：铜通过对铁基组织的合金化和沉淀强化，影响刹车材料的密度、孔隙度、基体显微硬度、表观硬度以及抗压强度。

The results show that the density , porosity , hardness and compressive strength are influenced by the copper content through the alloying and precipitation hardening of copper in iron .