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以Fe60合金粉末为原材料,通过添加1%~5%的SiC形成复合合金粉末,利用激光直接沉积技术在Q235钢表面制备SiC增强Fe60合金高耐磨涂层,主要应用OM、SEM、EDS、XRD、显微硬度测试和摩擦磨损等分析手段对样品的组织结构及性能进行了研究。结果表明,在优化的激光工艺参数:功率1 700 W、扫描速度6mm/s、送粉量8.8g/min、搭接率30%、光斑直径4mm×4mm和300℃预热等条件下,成功制备出了无裂纹缺陷厚度达到6mm的Fe基合金涂层;沉积层组织由等轴晶、枝晶、柱状晶组成,主要由α-Fe、γ-Fe及Cr_(23)C_6、Fe_2B、Cr_3Si原位增强相组成;发现在300℃温度下预热能够有效消除制备高C高Cr含量Fe基涂层易出现裂纹的难题;当SiC添加量为3%时,制备涂层具有最高的硬度达到1072HV,比未添加SiC的合金涂层提高了284HV,具有良好的耐磨性能。
The Fe60 alloy powder was used as the raw material to form the composite alloy powder by adding 1% ~ 5% SiC. The laser direct deposition technique was used to prepare SiC reinforced Fe60 alloy high wear-resistant coating on Q235 steel surface. The main applications were OM, SEM, EDS, XRD , Microhardness test and friction and wear analysis of the sample structure and properties were studied. The results show that under the conditions of optimized laser process parameters: power of 1 700 W, scanning speed of 6 mm / s, feed rate of 8.8 g / min, overlap rate of 30%, spot diameter of 4 mm × 4 mm and preheating at 300 ℃, The Fe-based alloy coating with 6mm crack-free defects was prepared. The deposited layer consisted of equiaxed, dendritic and columnar crystals and consisted mainly of α-Fe, γ-Fe and Cr 23 C 6, Fe 2 B and Cr 3 Si The results show that preheating at 300 ℃ can effectively eliminate the problem of cracks easily appearing in Fe-based coatings with high C and high Cr content. When the amount of SiC is 3%, the prepared coatings have the highest hardness 1072HV, 284HV higher than the alloy coating without SiC, which has good wear resistance.