Interface phase evolution during laser cladding of Ni-Cu alloy on nodular cast iron by powder pre-placed method

• Published in: Optics and laser technology 2021-03, Vol.135, p.106684, Article 106684
• Main Authors: Li, Yongjian, Dong, Shiyun, Liu, Xiaoting, He, Peng, Ren, Xudong, Yan, Shixing, Xu, Binshi
• Format: Article
• Language: English
• Subjects: Cast iron; Chemical composition; Chill casting; Chilled structure; Cooling; Copper; Dilution; Laser beam cladding; Laser beam welding; Laser cladding; Microhardness; Microstructure; Nickel base alloys; Nodular cast iron; Nodular iron; Optical microscopes; Pre-placed powders
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/j.optlastec.2020.106684

Laser cladding of nodular cast iron using powder pre-placed method was successfully carried out. Chilled structure could also be eliminated obviously and the dilution ratio of the cladding could be also obviously reduced. [Display omitted] •Laser cladding of nodular iron using powder pre-placed method was carried out.•Chilled structure could be eliminated obviously using powder pre-placed method.•Dilution ratio was reduced and average hardness of the interface decreased. Nodular cast iron is famous for its poor weldability owing to the great tendency of chilled structure in the interface zone during welding and cladding process. In order to eliminate chilled structure, laser cladding of nodular cast iron using powder pre-placed method was successfully carried out. The dilution ratio could be reduced obviously, and the chilled structure also could be eliminated. The microstructure was determined and the microhardness characteristics were researched. Optical microscope (OM) and Scanning electron microscopy (SEM) were used to identify the microstructure. Chemical composition was carried out using Energy dispersive spectrometer (EDS). The results also showed that the average microhardness of the interface zone decreased obviously when the chilled structure was eliminated.