论文部分内容阅读
采用埋弧自动焊方法在Q235钢表面制备出原位合成的WC陶瓷颗粒增强堆焊合金耐磨层。借助光学显微镜和显微硬度计等试验仪器,考察了基体稀释率对堆焊层显微组织和性能的影响。结果表明:越靠近熔合线的区域,基体稀释率越大,对堆焊层组织和硬度的影响也越大。从堆焊层的上部到其底部,其显微组织碳化物呈Fe3W3C→WC→Fe3W3C变化规律。而堆焊层的显微硬度在中部时达到最大值而在底部时达到最小值。
The submerged arc welding method was used to prepare WC ceramic particle reinforced hardfacing alloy in-situ synthesized on the surface of Q235 steel. With the aid of optical microscope and microhardness tester, the influence of substrate dilution rate on the microstructure and properties of overlay was investigated. The results show that the closer to the fusion line, the greater the matrix dilution rate, the greater the effect on the microstructure and hardness of the overlay. From the top of the overlay to the bottom, the microstructure of the carbide showed the variation of Fe3W3C → WC → Fe3W3C. The microhardness of the surfacing layer reaches the maximum in the middle and reaches the minimum in the bottom.