【摘要】 采用正交试验方法,使用等离子弧增材修复技术在K360钢表面制备了不同参数下的铁基合金耐磨层,观察了耐磨层的表面成形和横截面形貌,分析了工艺参数对耐磨层边缘平直度、熔深、熔宽、余高和稀释率的影响,以耐磨层表面边缘平直度和稀释率为评价指标优化了工艺参数,并对优化后工艺参数下的耐磨层进行了显微硬度测试和微观组织观察。结果表明,当熔覆电流为190 A,送粉速度为46 g/min,扫描速度为30～35 cm/min时,耐磨层表面成形较好、稀释率较低,为优化的工艺参数。选择熔覆电流为190 A,送粉速度为46 g/min,扫描速度为30 cm/min进行增材修复试验,该参数下的耐磨层硬度值较高,平均硬度为HV_0.3587.5,耐磨层的显微组织主要由马氏体和碳化物组成。更多还原

【Abstract】 Fe-based alloy wear-resistant layer on the surface of K360 steel produced by plasma transferred arc additive repairing technology under different processing parameters using orthogonal experiment method. The surface shaping and cross-sectional morphology of wear-resistant layer were observed and the influence of processing parameter of edge flatness, penetration depth, width, height and dilution rate were analyzed. The processing parameter were optimized taking edge flatness and dilution rate as evaluation indices and the microstructure and microhardness of the wear-resistant layer under optimized parameter were studied. The results showed that there were defect such as incomplete fusion and porosity appeared in the interface under inappropriate parameters. When the cladding current was190 A, the powder feeding speed was 46 g/min and the scanning speed was 30～35 cm/min, the wear-resistant layerhad better surface shaping and lower dilution rate, which were the optimized processing parameters. The cladding current was 190 A, canning speed was 30 cm/min and powder feeding speed was 46 g/min was selected as process parameter to carry out additive repairing experiment. It turned out the average hardness of wear-resistant layer was HV_0.3587.5 and the microstructure of wear-resistant layer was composed of martensite and carbides.更多还原