Effect of powder size and volume fraction of WC on the microstructure of laser cladding WC-NiCrBSi composite coatings
WC-NiCrBSi composite coatings on 0.45 % carbon steel were fabricated by laser cladding.The volume fraction (33,43 and 60 vol.%) of WC particles with the powder size of 2 μtm,5 μtm and 50 μm were added respectively into NiCrBSi powders to deposit composite coatings.The microstructure of the powders and the coatings were examined by scanning electron microscope (SEM) and X-ray diffraction (XRD).Results show that the compactness and uniformity of the coatings are good when WC particles size was 2 μm and 5 μm.However nonuniform distribution and deposit of WC particles on the bottom of the coating will occur when the powder size of WC particles was 50 μm and the volume fraction of WC was 33 %.When the volume of WC addition was higher than 60 %,the volume fraction of the retained WC particles in the coatings is obviously decreased.The dissolving and decomposing of WC increase with decreasing the powder size and increasing the volume of WC addition and the laser power.
WC NiCrBSi composite coating Laser cladding Microstructure Crystal structure
Y.-Y.Wang Y.-F.Gong T.-F.Sun P.-F.Ni Z.Liu G.-H.Gao C.-J.Li
State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, China
国际会议
台湾
英文
105-109
2011-12-11（万方平台首次上网日期，不代表论文的发表时间）