【摘要】 以绿色湿法冶金制备的超细铁粉为原材料，通过添加质量分数为20%的雾化铁粉，制备Fe-2Cu-0.5Mn-0.6C合金烧结材料，并对其进行表面超声滚压加工，研究了滚压振幅为8μm时，不同滚压力（400、600、800 N）对合金微观组织、力学性能以及表面粗糙度的影响规律。结果表明：表面超声滚压后，合金的组织和性能发生了明显的变化，随着滚压力的增加，合金表层组织沿着滚压方向被拉长，并在较大的滚压力下晶粒发生明显破碎；在滚压过程中合金发生塑性流动，孔隙闭合，表面的致密层逐渐加厚，滚压后合金表层产生了位错强化和细晶强化，表面粗糙度下降，表面硬度大幅提高，滚压力越大，表面容易产生疲劳和剥落，表面质量下降。在滚压力为800 N时试样的致密层厚度为296μm，表面滚压后的平均晶粒大小为3.4μm，表面硬度为287HV_0.1，表面粗糙度为0.811 4μm。更多还原

【Abstract】 Ultrafine iron powder prepared by green hydrometallurgy was used as raw material to prepare Fe-2Cu-0.5Mn-0.6C alloy sintered material by adding atomized iron powder with mass fraction of 20%,and its surface was rolled by ultrasonic rolling.The rolling amplitude of 8μm was studied.Effects of different rolling pressures （400,600,800 N） on microstructure,mechanical properties and surface roughness of the alloy.The results show that the microstructure and properties of the alloy are obviously changed after ultrasonic rolling.With the increase of the rolling pressure,the microstructure of the alloy surface is elongated along the rolling direction,and the grain is obviously broken under the larger rolling pressure.During the rolling process,the alloy has plastic flow,the pores are closed,and the dense layer on the surface is gradually deepened.After rolling,the surface layer of the alloy has dislocation strengthening and fine crystal strengthening,the surface roughness decreases,the surface hardness increases significantly,and the greater the rolling pressure,the surface is prone to fatigue and spalling,and the surface quality decreases.When the rolling pressure is 800 N,the thickness of the dense layer of the sample is296μm,the average grain size after rolling is 3.4μm,the surface hardness is 287HV_0.1,and the surface roughness is 0.811 4μm.更多还原