Microstructures and Enhanced Mechanical Properties of (Zr, Ti)(C, N)-Based Nanocomposites Fabricated by Reactive Hot-Pressing at Low Temperature.

Dense and enhanced mechanical properties (Zr, Ti)(C, N)-based composites were fabricated using ZrC, TiCN, and Si powders as the raw powders by reactive hot-pressing at 1500-1700 °C. At the low sintering temperature, both (Zr, Ti)(C, N) and (Ti, Zr)(C, N) solid solutions were formed in the composites by adjusting the ratio of ZrC to TiCN. During the sintering process, the Si added at a rate of 5 mol% reacted with ZrC and TiCN to generate SiC.

Biologically competitive effect of Desulfovibrio desulfurican and Pseudomonas stutzeri on corrosion of X80 pipeline steel in the Shenyang soil solution.

In this paper, we have investigated the corrosion mechanism of X80 carbon steel in the presence of nitrate reducing bacteria (NRB), sulfate reducing bacteria (SRB) or both in the Shenyang soil solution. The results show that both SRB and NRB increase the corrosion rate of steel specimens and cause pitting corrosion of steel. Electrochemical tests and weight-loss data show that the addition of NRB in the SRB-containing environment leads to the reduction of corrosion.

Synergistic effect of alternating current and sulfate-reducing bacteria on corrosion behavior of X80 steel in coastal saline soil.

With the development of electrified railways and high-voltage transmission lines, it is often inevitable that buried metal structures are subjected to interference from the alternating current (AC) induced by the neighboring power facilities. Commonly found in soil, sulfate-reducing bacteria (SRB) have the capability to accelerate metal corrosion. In this paper, with electrochemical methods, surface analysis techniques, and weight-loss test, the influence of AC and SRB on the X80 steel corrosion behavior was explored in coastal saline soil.

Microstructure Evolution in ZrC with Different Stoichiometries Irradiated by Four MeV Au Ions.

ZrC ceramics with different stoichiometries were irradiated under a four MeV Au ion beam in doses of 2 × 10 ions/cm at room temperature, corresponding to ~130 dpa. Grazing incidence, X-ray diffraction and transmission electron microscopy were performed to study the radiation damage and microstructure evolution in ZrC ceramics. With the decrease in C/Zr ratio, the expansion of ZrC lattice became smaller after irradiation.

Corrosion kinetics and mechanisms of ZrC ceramics in high temperature water vapor.

The corrosion kinetics and mechanisms of ZrC ceramics in water vapor between 800 and 1200 °C were investigated. The results showed that there was only cubic ZrO phase in the corrosion layer when corroded at 800 °C, while a scale layer consisted of a mixture of cubic and monoclinic ZrO phases when corroded at 1000 °C and 1200 °C. A series of crystallographic relationships at the ZrC/c-ZrO interface were detected.