Metal Science and Heat Treatment

Elagin, V.; Samarina, M.; Zakharov, V.

doi: 10.1007/s11041-010-9204-ypmid: N/A

The effect of different modes of three-stage aging on the structure and properties of hot-deformed semiproducts (pressed shapes and rolled plates) from high-strength aluminum alloy V96Ts-3 of the Al – Zn – Mg – Cu system is studied with the aim of optimizing the hardening heat treatment. Amode of three-stage aging convenient for commercial production and ensuring hot-deformed semiproducts from alloy V96Ts-3 with high strength at the state T1 level in combination with satisfactory corrosion resistance corresponding to state T2 is suggested.

Silman, G.

doi: 10.1007/s11041-010-9205-xpmid: N/A

Some methods of microcomposite structurization of ferrite in cast iron are considered, and their effects on the changes in the mechanical properties of alloys are analyzed. The special features of iron where siliconized ferrite undergoes spinodal layering combined with other aging processes are presented. The effect of silicon, copper, and molybdenum on the structure of ferrite and on the properties of cast iron is estimated.

Makarenko, K.

doi: 10.1007/s11041-010-9206-9pmid: N/A

Special features of distribution of graphite inclusions in cast iron with globular graphite (IGG) are studied. The method of fractal analysis of images is used for determining the regular features of the distribution of eutectic cells during crystallization of iron. The dependences obtained are used for developing a fractal model of cluster crystallization of IGG.

Dzhandieri, G.; Surguladze, T.; Robakidze, D.; Shalamberidze, M.; Shchukin, B.

doi: 10.1007/s11041-010-9207-8pmid: N/A

Special features and possibilities of increasing the efficiency of the process of direct alloying of steel and alloys by briquettes of carbonate manganese are analyzed. The results of the analysis are used to solve the problem of minimization of the duration of treatment of liquid alloys and ensuring maximum utilization of briquettes fed into the metal by mathematical simulation (prediction) of the effect of external thermophysical factors. Solution of this problem makes it possible to affect the controlled parameters of the production process (fraction size and initial temperature of the briquettes). The functional dependences of the parameters are used to develop a structural model of a system for automatic control of the process of direct alloying of alloys.

Perevezentsev, B.; Kurmaev, M.

doi: 10.1007/s11041-010-9208-7pmid: N/A

The structure and properties of alloys with microadditives are studied for the Sn – Ag – Cu ternary system. Variants of microalloying raising the mechanical properties of the alloys are considered.

Fedin, V.; Borts, A.

doi: 10.1007/s11041-010-9218-5pmid: N/A

Some scientific, engineering, and process aspects of heat hardening of rolling stock screw springs from steels with reduced (55PP) and controlled (55RP) hardenability by the method of volume-surface hardening are considered. The efficiency of the new process from the standpoint of saving of resources due to decrease in the content of alloying elements in the metal and increase in the relaxation resistance and in the endurance limit of the springs hardened by the volume-surface method is demonstrated. Results of laboratory and field tests are analyzed. The main components of a spring production line are described.

Li Hua, Gong; Yu, Zhang

doi: 10.1007/s11041-010-9209-6pmid: N/A

The effect of heat treatment on the susceptibility of steel 0Cr18Ni9Ti to pitting and intergranular corrosion is studied. The corrosion resistance of the steel is determined using the methods of metallography and potentiodynamic analysis.

Mal’tseva, L.; Zavalishin, V.; Mikhailov, S.; Ozerets, N.; Mal’tseva, T.; Sharapova, V.

doi: 10.1007/s11041-010-9210-0pmid: N/A

Some physical properties reflecting the changes in the structure of steel 03Kh14N11K5M2YuT in stages of the process of production of wire for medical instruments, resilient members, and springs are studied. The electrical resistivity, density, crystal lattice parameter, Young’s modulus, and shear modulus of the metal are determined. The microhardness and the content of magnetic phase are measured. X-ray diffraction analysis is performed. The possibility of measuring the physical properties for optimizing the process of production of high-strength wire instead of the laborious methods of determining the structural state of the steel is estimated.

Nie, Xiao-wu; Lu, Shiqiang; Wang, Kelu

doi: 10.1007/s11041-010-9211-zpmid: N/A

Thermodynamic analysis of NbCr2 intermetallic obtained by mechanical alloying and subsequent hot pressing is performed. High-purity powders of niobium and chromium in molar proportion of 1 : 2 are treated in a ball mill for up to 100 h. Then the powders are sintered in vacuum (1250°C, 0.5 h) at a pressure of 45 MPa. This yields massive nanocrystalline and/or amorphous NbCr2 intermetallic. The transformation of crystalline NbCr2 into nanocrystalline or amorphous intermetallic is studied using methods of x-ray diffractometry or scanning electron microscopy. The semi-empirical Miedema model is used to compute the chemical driving force of formation of the amorphous and crystalline phases.

Glebov, V.; Popova, O.; Bakulina, A.; Chukanov, A.; Yagodkin, Yu.; Shchetinin, I.

doi: 10.1007/s11041-010-9212-ypmid: N/A

The methods of x-ray diffraction analysis, Mössbauer spectroscopy, and transmission and scanning electron microscopy are used for studying structural transformations that occur in high-energy milling of steel 12Kh12M1BFR with additives of fullerenes and carbon nanotubes.