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To decrease the turning-induced pitting susceptibility of laser-cladded Fe–Cr–Ni layer by low plasticity burnishing

Zhang Peirong, Hu Shunrui, Lv Tao, Du Jin, Su Guosheng, Liu Zhanqiang, Xu Chonghai

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 4

art. no. e179, 2022

Corrosion resistance of machined surface and its correlation with surface roughness have been the important concerns for sustainability of the final products. However, the pitting corrosion of laser-cladded Fe–Cr–Ni layers by turning exhibits susceptibility to surface roughness characteristics. In present study, the generation mechanism of pitting susceptibility by turning and the effect of burnishing on decreasing the pitting susceptibility were explored. To this end, a theoretical model of the potential difference between roughness peaks and valleys was established with considering the functional parameters of the surface roughness. Then, the correlations between the potential difference and pitting characteristics including pitting depth, width and area were analyzed in order to reveal the generation mechanism of pitting susceptibility. The occurrence of pitting corrosion could be predicted by the local potential difference, which was higher at the location where pitting corrosion would occur while lower where pitting corrosion did not occur. Finally, the influence of each functional parameter of surface roughness on the potential difference was analyzed using the proposed model, with which the machining schematics were discussed. On the basis of this research, it was expected to improve the corrosion resistance of the claddings by turning and subsequent burnishing process chain.

Parametry eksploatacyjne i konstrukcyjne wybranego tunelu drogowego wraz z założoną technologią i bezpieczeństwem realizacji tunelu

Topolnicki M., Buca R.

Inżynieria i Budownictwo

2013

R. 69, nr 1

36-41

Przedstawiono zabezpieczenie stateczności i szczelności głębokich wykopów na trasie tunelu wykonywanego w otwartym wykopie, łącznie z komorą startową i odbiorczą dla maszyny TBM. Wdrożono technologię głębienia wykopu „na sucho”, po technicznym odcięciu dopływu wody gruntowej przez ściany i dno. Uszczelnienie dna obejmowało naturalne grunty spoiste lub poziomy ekran przeciwfiltracyjny, wykonany metodą iniekcji strumieniowej. Działanie wyporu zrównoważono przez elementy kotwiące.

Presented is the solution adopted for realisation of deep excavation pits build along the tunnel in open cut, including starting and receiving chambers for the TBM. The excavation control comprised diaphragm walls and bottom sealing, enabling tunnel construction in „dry” conditions after providing effective cut-off against seepage of the groundwater. The bottom sealing involved natural clayey soils or horizontal jet grouting slabs. The action of uplift water pressure was compensated by suitable structural tension elements.