Metal Science and Heat Treatment

Tsukanov, V.; Ziza, A.; Mikhailov, M.; Tsyganko, L.; Shandyba, G.

doi: 10.1007/s11041-016-0021-9pmid: N/A

High-strength cast iron of grade VCh50 with globular graphite is studied after isothermal quenching in the bainitic and martensitic ranges. The mechanical properties of the iron and the hardness of its structural components are determined. The fine structure of the iron with bainitic and martensitic matrix is studied. The effect of the tempering temperature after the isothermal quenching on the hardness and structure of the iron is estimated.

Zhizhkina, N.

doi: 10.1007/s11041-016-0022-8pmid: N/A

The mechanical properties and the structure of forming rolls from cast irons of different compositions are studied. A novel iron including a copper additive that lowers its chilling and raises the homogeneity of the structure is suggested for the roll cores. The use of such iron should raise the reliability of the rolls in operation.

Men’shikova, S.; Shirinkina, I.; Brodova, I.; Lad’yanov, V.; Suslov, A.

doi: 10.1007/s11041-016-0023-7pmid: N/A

The effect of superheating of melt on structure formation in hypereutectic alloy Al – 1.2 at.% Co is studied under the conditions of rapid cooling. It is shown that any superheating of the melt yields a double-phase structure in ribbons, which is represented by an aluminum solid solution partially supersaturated with cobalt and cobalt aluminides. Annealing changes the morphology of the cobalt aluminides. The solid solution decomposes at about 350°C.

Nikitin, K.; Chikova, O.; Amosov, E.; Nikitin, V.

doi: 10.1007/s11041-016-0024-6pmid: N/A

The possibility of shortening the heat treatment hold of silumins of the Al – Si – Cu system by changing the parameters of the structure under chill casting is considered and a criterion for their evaluation is suggested. Alloys AK6M2 and AK8M3ch are used to demonstrate experimentally that decrease in the sizes of the crystals of primary silicon and in the transverse size of the α-Al secondary dendrite arms can halve the time of holding for quenching and aging at a guaranteed margin of the strength properties.

Wang, Qinglei; Geng, Haoran; Wang, Fulan; Lin, Xiangze; Wang, Chongyang

doi: 10.1007/s11041-016-0025-5pmid: N/A

The effect of the parameters of thermal-rate treatment of melt on the iron-containing phases in alloy Al – 15% Si – 2.7% Fe is considered. The structure and mechanical properties of the alloy are determined after a thermal-rate treatment conducted at different temperatures of the melt, different pouring temperatures, and different holds at the pouring temperature. The optimum variants of thermal-rate treatment of melt for alloy Al – 15% Si – 2.7% Fe are chosen.

Volkova, E.

doi: 10.1007/s11041-016-0026-4pmid: N/A

The possibility of application of a nonstandard deformation process by the method of hydroextrusion (HE) to commercial high-strength magnesium alloys MA14 and MA22 is studied and proved. It is shown that specific modes of HE deformation raise the level of the strength properties of the alloys by 25 – 50% as compared to the standard deformation process.

Lubas, M.; Kulakovska, A.; Gembara, P.

doi: 10.1007/s11041-016-0027-3pmid: N/A

The structure of alloy Ti – 10% Zr is studied after thermal oxidizing. Microstructural, phase and potentiometric analyses of the alloy are performed. The alloy is shown to be suitable for stomatology.

Yur’ev, B.; Gol’tsev, V.

doi: 10.1007/s11041-016-0028-2pmid: N/A

A study of commercial tubes from steel ShKh15 produced in a chamber furnace is performed for investigating the active annealing process. The causes of inappropriate heating and cooling of tubes in a charge are determined. The annealing mode is shown to mismatch the required temperature regime, which elevates rejection. Recommendations for eliminating the determined drawbacks, raising the quality of the annealed tubes and the output of the chamber furnaces are developed.

Khlybov, A.

doi: 10.1007/s11041-016-0029-1pmid: N/A

The effect of heat treatment on the structure and physical and mechanical properties of flat specimens cut from a massive billet from steel 15Kh2MFA with an austenitic facing on one side is studied. The hardness and the microhardness of the specimens are determined. Acoustic and x-ray studies are performed. The causes of residual stresses giving rise to deformation and formation of cracks in the faced steel are established. Ways to solve the problem are suggested.

Ostovan, Farhad; Matori, Khamirul; Yusoff, Hamdan; Yunus, Robiah; Ariff, Azmah; Toozandehjani, Meysam; Meschian, Mohammad

doi: 10.1007/s11041-016-0030-8pmid: N/A

The effect of heat treatment on the microstructure, hardness and density of sintered (1129°C, 45 min) specimens of iron-base powder alloys containing 0.8 – 2.5% C, 2% Cu and additives of chromium- and molybdenum-alloyed Astaloy E iron powder is studied.