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Selected Communications, Short Notes, and Abstracts
Published in V. B. Dement’ev, A. K. Haghi, V. I. Kodolov, Nanoscience and Nanoengineering, 2019
V. B. Dement’ev, A. K. Haghi, V. I. Kodolov
The nanostructured components obtaining method in alloying layers on the surface of castings, which made of iron–carbon alloys is presented. Castings are produced by casting on consumable pattern through the occurrence of self-propagation high-temperature synthesis in alloying compositions. The behavior of synthesis is achieved by using compositions containing, as one component a titanium and a ferrotitanium, and initiation of synthesis is made at the moment of castings shaping due to thermal energy of the melt. Principle stages of the observed method and regularities of synthesis behavior in are reflected in this chapter.
Research Progress on the Extractive Metallurgy of Titanium and Its Alloys
Published in Mineral Processing and Extractive Metallurgy Review, 2021
Yulai Song, Zhihe Dou, Ting-an Zhang, Yan Liu
Up to now, huge investment on extractive metallurgy of titanium has been adopted, while the Kroll method is still the only way for industrial application; meanwhile, the complex process, high energy consumption, and chlorine corrosion to equipment had hindered the widespread application of titanium. Electrolysis seems an epochal progress on the application of titanium extraction; however, the corresponding status on current efficiency, industrial-scale production, the electrode preparation, and continuous revolution also need to be improved. Then, the metallothermic reduction based on SHS has been gradually paid attention to its characterization with concise flow, high production efficiency, and the wide adaptability to raw materials. According to the law of phase transformation and the phase thermodynamic equilibrium concentration evolution in the reduction process of TiO2, a novel idea of multi-stage deep reduction procedure to prepare titanium and its alloys has been put forward by Zhang et al. (Cheng et al. 2019a, , 2019d, 2017; Cheng, Zhang and Dou 2019b; Dou et al. 2014; Fan et al. 2019b, 2020; Song et al. 2019, 2020; Zhang et al. 2013,) in Northeastern University, China. At present, ultra-low oxygen high ferrotitanium, TiAl master alloy, powder titanium, and titanium alloy have been successfully prepared.
The Influence of Acid Mine Drainage on Distribution Region of Heavy Minerals (Fetio3, ZrSiO4): On Case of DanChon Coast in the Eastern Sea of Korea
Published in Soil and Sediment Contamination: An International Journal, 2020
Dongsu Hyon, Ryonghung Kim, Seik Jang, Ilgyong Kim
DanChon district is a central base to product the minerals of nonferrous metals and magnesite or magnesia clinker counting much in Korea. The SongJin Formation of deposit region was composed to gneisses, crystal schists, marble, amphibole and quartzite of minor amount that can associate with nonmetalic minerals such as graphite, mica and apatite, and iron or rare metallic minerals (e.g., ferrotitanium, zircon and sedimentary metamorphic iron). Pb-Zn, Cu and Fe deposits, magnesite or talc deposits is connected with carbonate rock of NorthChon Formation. Cu-Fe sulphide and Fe sulphide deposits is associated with schists of SouthChon Formation. In DanChon district, there are two small rivers flowing into the eastern sea of Korea. The river that refers as NorthChon has the length of 128.1km and the catchment area of 1,445.1 km2, while the other SouthChon river has the length of 50.0km and the catchment area of 378.8 km2. NorthChon is discharged through basalt land, but SouthChon flows into Mesozoic erosive granite. The average of flux and the average of the effluence height that recorded in NorthChon estuary during recent 30 years was 18.33m3/s, 390.55mm, respectively. The annual mean of temperature in DanChon area is 8.8°C and annual average of rainfall is 600–700 mm.
The wear resistance increasing of low-carbon deposited metal with different manganese content due to the receipt of metastable austenite in the structure
Published in Welding International, 2020
L. S. Malinov, V. L. Malinov, D. V. Burova
Single-lock powder tapes 10 × 3 mm in size with a filling factor of 48–50% were made. Various amounts of metal manganese, iron powder, as well as a small amount of ferrotitanium for the formation of carbides, grain refinement in the deposited metal, and a decrease in the carbon content in martensite to reduce its brittleness were introduced into the composition of the charge. Metallic chromium was introduced into a number of flux-cored tape compositions. Cold-rolled strip made of 08Kp steel was used as a steel shell. Cladding with flux-cored strips, providing a content of ∼5 and ∼8% manganese in the deposited metal, was carried out with preheating, delayed cooling after surfacing, and tempering immediately after it. When 14% manganese was obtained in the deposited metal, preheating was not performed. Surfacing was carried out in three layers under an AN-26 flux on a 30 mm thick plate made of 09G2S steel in the following mode: current strength 450–500 A, voltage 28 … 30 V, surfacing speed 30 m/h. The chemical composition of the deposited metal is given in Table 1. Tempering of specimens cut from deposited metal was carried out at temperatures of 450, 550, 650, 750°С with holding for 1 h and subsequent cooling in air. Durometric, metallographic and X-ray studies were carried out, as well as tests of wear resistance under dry friction according to the shoe-roller scheme and in a stream of particles transported by compressed air. The samples were positioned at an angle of 60° to the shot flow. The reference standard for all types of tests was the weld metal PL-Np 18Kh1G1M, tempered at 650°C.