372595869

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ANALYSIS, TESTING

JPRS-UMS-92-003 16 March 1992

the method of separation of variables and the computa-tion results are analyzed. The conclusion is drawn that the intensive strain and failure in the edge zonę occur after the end of the explosion welding process and are caused by the reflected relief wave. The consistency of experimenta! and analytical results is noted. Figures 3; references 6.

Approximation Model of Stnictural Materiał Failure and Failure Wave Problem

927D0062B Kiev PROBLEMY PROCHNOSTI in Russian No 9(267), Sep 91 pp 4-6

[Article by A.S. Kravchuk, A.V. Malashkin, All-Union Mechanical Engineering Correspondence Institute, Moscow]

U DC 539.4

[Abstract] Transmission of a failure wave through a structural materiał with discontinuities is analyzed by the continuous computation method whereby the dis-continuity “spreading” procedurę is interpreted in a physical sense as an accumulation of failures in a tran-sition layer which results in a transition of the materiał into another with altered characteristics. The procedurę is based on measuring the variations in the moduli of elasticity when Crossing the wave front. The method is illustrated by an analysis of the spherical failure wave motion. Figures 2; references 4.

Analysis of Rapid-Quenched Strip Surface Configuration and Quality

927D0061I Moscow STAL in Russian No 12, Dec 91 pp 68-71

[Article by B.V. Molotilov, N.M. Zapuskalov, V.T. Timofeyev, All-Union Scientific Research Institute of Ferrous Metallurgy and All-Union Science Research Institute of Metallurgical Machine-Building]

UDC 669-175.2

[Abstract] The results of an investigation carried out in an AMKL-150 double-roller unit using two sets of water-cooled bronze rollers in order to establish the pattems of inhomogeneities appearing in rapidly quenched strip and determine their causes are presented. Surface rough-ness parameters were measured by a roughness indicator manufactured by the Kalibr plant as well as a Surtronic-3P instrument madę by Taylor-Hobson, the strip thick-ness was measured under a micrometer, and the strip length by a ruler. The strip configuration variations during the process and the thickness distribution in a strip madę in flexible and rigid roli sleeves are plotted. The effect of the rolleris barrel shape on the strip scalę width and thickness variation is examined. An analysis demonstrates that the width of the strip produced by the rapid quenching method in rollers is determined by the metal consumption ratę and depends on the molten metal pool vibrations while the cross-sectional strip shape is determined by the design features of the continuous casting solidification rollers. Figures 7; references 5: 4 Russian, 3 Western.

Testing of 32G2F Steel for High-Strength Drill Pipę Shells

927D0061H Moscow STAL in Russian No 12, Dec 91

pp 60-62

[Article by Ye.A. Solomadina, D.A. Akhmedova, A.I. Ramazanov, Ye.L. Vasilyev, A.S. Bondarenko, All-Union Scientific Research Institute of Tubę Industry and Azeri Pipę Rolling Mili]

UDC 621.785.616.1:621.78.083]:621.791.052

[Abstract] Studies confirming that Iow alloy Steel 32G2 is not suitable for making drill pipes of strength class L or higher are outlined and the need to usc Steel with higher stability of supercooled austenite is identified. As a result, Steel 32G2F additionally alloyed with vanadium is studied and tested for the first time; to this end, the kinetics of austenite transformation in this Steel are investigated and the continuous cooling transformation diagram is plotted with the help of a Linsize dilatometer. The mechanical properties of drill pipę shells from Steel 32G2 and 32G2F are summarized and compared to each other and the microstructure of dilatometry samples cooled at different rates is analyzed. The continuous cooling transformation diagram of Steel 32G2F demonstrates that in order to attain a martensite structure in drill pipes after quenching, the cooling ratę must be at least 65 K/s. A study of mechanical properties of Steel 32G2F shows that the mechanical properties of hot rolled tubes meet the requirements of strength class E with a considerable safety margin and meet the specifi-cations of TU 14-3-1571—88. Work on improving the equipment and methods of heat treatment is underway at the Azeri Tubę Rolling Mili. Figures 2; tables 2.

Z1O2-Y2O3-SC2O3 System’s Liąuidus Surface

927D0069A Moscow IZYESTIYA AKADEMII NAUK SSSR: SERIYA NEORGANICHESKIYE MATERIAŁY in Russian Vol 27 No 12, Dec 91 pp 2673-2675

[Article by A.V. Shevchenko, L.M. Łopato, I.M. May-ster, Institute of Materials Science Problems imeni I.N. Frantsevich at the Ukrainian Academy of Sciences]

UDC 548.651/659

[Abstract] Phase cquilibria and constitution diagrams binary and temary Z1O2-Y2O3-SC2O3 system are dis-cussed and an attempt to investigate the liquidus surface of the Z1O2-Y2O3-SC2O3 temary system which can be used for developing high-temperature refractory mate-rials and clarify the liquidus curve which servcs as the boundary of the binary Y₂03-Sc₂0₃ system is described. The boundaries of the phase domains are determined