Kalienko, M. S. Volkov, A. V. Zhelnina, A. V. Leder, M. O. Panfilov, P. E.
Published in
Metal Science and Heat Treatment
Sheets from titanium alloys VT18U and Ti6Al7Nb are studied after isothermal annealing at 560°C for 1000 h in an air atmosphere. Tensile tests of the specimens are performed. The elongation of the samples of VT18U and Ti6Al7Nb is shown to differ substantially in oxidized condition. Metallographic, fractographic and x-ray diffraction analyses are per...
Bannykh, O. A.
Published in
Metal Science and Heat Treatment
The particular features of structure formation in high-nitrogen austenitic steels characterized by intermittent decomposition of solid solution and ductile-brittle transition are considered. The effects of heat treatment, thermoplastic treatment, and alloying elements on the physical and mechanical properties of high-nitrogen austenitic steels are ...
Kuryntsev, S. V. Morushkin, A. E. Shigapov, A. I.
Published in
Metal Science and Heat Treatment
Results of a study of billets from steel 30KhGSA after a volume laser treatment, which consists of high-speed (20 mm/sec) remelting of a metallic plate with a thickness of 10 mm by a laser beam, are presented. It has been expected that this treatment process should yield a laser-beam-remelted gradient layer with changed microstructure due to the hi...
Shurkin, P. K. Akopyan, T. K. Galkin, S. P. Aleshchenko, A. S.
Published in
Metal Science and Heat Treatment
A high-strength aluminum alloy based on the Al – Zn – Mg – Ni – Fe system is studied in deformed condition after radial shear rolling with reduction 2.78 and 8.16. The microstructure and the hardness are shown to change in the process of the thermal deformation involving quenching and aging by modes T and T1. The bars deformed with reduction 8.16 h...
Georgiev, M. N. Simeonova, T. V.
Published in
Metal Science and Heat Treatment
The crack resistance of railroad rails with transverse internal and external cracks in the head formed in operation is determined. The ultimate crack resistance Ic, the values of which coincide with the critical values of the stress intensity factor KIc under the brittle fracture typical for rails, is determined.
Wang, Chang Yu, Zhentao Cui, Yajun Yu, Sen Ma, Xiqun Liu, Hanyuan
Published in
Metal Science and Heat Treatment
The effect of hot rotary swaging and subsequent annealing on the microstructure and mechanical properties of magnesium alloy WE43 of the Mg – Y – Nd – Zr system is studied. The optimum temperature of rotary swaging providing refinement of the microstructure, change in the preferential grain orientation, strain hardening and growth in the strength i...
Belyaev, I. V. Bazhenov, V. E. Moiseev, A. V.
Published in
Metal Science and Heat Treatment
Nonmetallic inclusions in magnetic alloys of the Fe – Co – Ni – Cu – Al – Ti system with additions of niobium and hafnium used in the production of single-crystal permanent magnets are studied. The kinds of inclusions in magnetic alloys are determined with the help of rapid analysis of the chemical composition, optical and electron microscopy, quan...
Zhang, Yong-jun Han, Jing-tao
Published in
Metal Science and Heat Treatment
An alternative for the traditional free-cutting steels, i.e., a graphitized steel, is suggested with allowance for the tendencies in design of free-cutting steels connected with reduction of the sulfur content and transfer to unleaded steels. The graphitization process due to inoculation of the steel with boron nitride (BN) is studied by metallogra...
Ye, Jie Lin, Xiao-ping Dong, Yun Teng, Fei Sun, Gui-fang
Published in
Metal Science and Heat Treatment
The structure of precipitates in alloy Mg – 8% Zn – 4% Al – 0.2% Cr – 0.5% Bi aged at 70 and 160°C for up to 1200 h is studied by high-resolution transmission electron microscopy. The hardness of the alloy is determined; the precipitates of the phases are identified in different aging stages.
Panchenko, O. V. Zhabrev, L. A. Kurushkin, D. V. Popovich, A. A.
Published in
Metal Science and Heat Treatment
The macrostructure and mechanical properties of clad metal produced by electric arc additive growth using wires of aluminum alloys of three alloying systems (Al – Si, Al – Mg – Si, and Al – Mg – Mn) are studied. The distribution of the pores is assessed, the porosity and the microhardness are evaluated. The anisotropy of the mechanical properties d...
