Metallographic studies of the alloy of Co – Cr – Fe – Mn – Ni system

In conditions of the Scientific and Production Center “Welding Processes and Technologies” of the Siberian State Industrial University, the developed flux-cored wires of the Co – Cr – Fe – Mn – Ni system were surfaced by automatic arc welding under a layer of flux. Chemical composition of the deposited coating samples was determined using the atomic emission method on the DFS-1 spectrometer and the X-ray fluorescence method on the XRF-1800 spectrometer. The research results indicate the possibility of obtaining coatings consisting of 60 – 70 % iron and 30 – 40 % alloying elements. Microstructural studies of the samples were carried out using the metallographic microscope METAM RV-34 and the NEXSYS ImageExpert software package. The deposited samples contain point oxides of grade 2a, non-deformable silicates of grade 4a, b. Compared with the substrate (09G2S steel), the resulting deposited layers of the samples are noticeably cleaner, however, K4 sample has less contamination. Microstructure of the first deposited layers is represented by needle-like martensite, which is confirmed by the results of microhardness measuring. Subsequent layers of the deposited samples are represented by an austenitic crystal structure. Moreover, the structure has an elongated (dendritic) structure, which is inherent in structures obtained by arc welding. The authors studied the microhardness distribution using the HVS-1000 microhardness tester according to Micro-Vickers GOST 9450 – 76. The results indicate the production of an alloy with a hardness slightly higher than that of the substrate used, while it is worth noting that the deposited layer contains zones with twice hardness. Most often, an increase in hardness is observed on the first deposited layers.

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