Properties of in-situ formed TiC-VC particle reinforced Fe-based alloy composite coatings produced by laser cladding on 42CrMo roller
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摘要: 采用同步送粉方式,在42CrMo轧辊基材上利用钛铁、钒铁和石墨等通过激光熔覆原位自生反应,制备了成型良好、致密无气孔、无裂纹、与基体呈冶金结合的TiVC2增强铁基熔覆层。利用X射线衍射、电子探针、显微硬度计、电化学工作站研究了熔覆层的显微组织及性能。结果表明,熔覆层中碳化物为TiVC2,TiVC2大小约0.5~2.0 m,呈多角块状均匀分布,碳化物对应两种不同的形核机制:以氧化铝异质形核和碳化物自发形核。随着熔覆合金粉末中TiC-VC数量的增加,熔覆层硬度并不呈简单的线性增加,熔覆层的耐蚀性逐渐变差。Abstract: By using synchronous powder feeding system, Fe-based cladding layers reinforced with in-situ TiVC2 particles were synthesized on 42CrMo roller by laser cladding the mixture powders of ferrotitanium, ferrovanadium and graphite. The cladding layers have good forming and metallurgical bonding with the substrate, without porosity and cracks. The microstructure and properties of the cladding layers were investigated by means of X-ray diffractometry (XRD), electron probe micro-analyzer (EPMA), microhardness tester and electrochemical workstation. The results show that the carbides in cladding layers are TiVC2 with a size of 0.5~ 2 m and these polygonal carbides distribute evenly in cladding layers. These carbides have two different nucleation mechanisms: the heterogeneous nucleation on alumina and the carbide spontaneous nucleation. With the increasing of Ti-VC in alloy powders, the hardness of cladding layers does not increase linearly, and the corrosion resistance of cladding layers decreases gradually.
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Key words:
- laser cladding /
- in-situ synthesis /
- TiC-VC /
- 42CrMo /
- corrosion resistance
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