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COMPARATIVE RESEARCH OF SHORT-TERM CREEP RATE OF TITANIC ALLOY VT1-0 AT THE HIGH TEMPERATURES IN AIR, HYDROGEN AND NITROGEN

Smirnov S.V. 1 Zamaraev L.M. 1 Matafonov P.P. 1
1 URAL BRANCH OF Russian Academy Of Sciences Institute Of Engineering Science, Ekaterinburg
Experimental research of deformation of standard samples from a titanium alloy VT 1-0 in a stepwise heating up to temperatures of 1100 0 C and the action of tensile stresses below the yield strength (up to 9,36 MPa) have been carried out in air, hydrogen and nitrogen. The elongations of the samples at each stage of heating have been measured in the experiments. On the basis of the received data the elongation diagrams of samples are constructed at temperatures from 400 to 1100 °С depending on the magnitude of tensile stress. Values of temperature of the beginning of deformation in the conditions of short-term creep are determined and creep speed are calculated by the diagrams. The received values of creep speed (v) have been subjected to the nonlinear regression analysis in the software package Statistica v. 8.0. As a result for the realized tension of loading (σ = 1,99; 4,45; 6,91 and 9,36 MPa) and temperatures of heating (t) from 400 to 1100 °С the following approximating dependence is received. v = a exp (b t), 1/second Empirical coefficients a, b in the formula for the investigated gaseous media and tensile stress values ​​are given in the table in text of article. The value of the reliability of approximation makes not less than 0,84.
titanium alloy
short-term creep
influence of gas media
tensile creep
creep speed
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Рецензенты:

Гладковский С.В., д.т.н., профессор, заведующий лабораторией деформирования и разрушения Института машиноведения УрО РАН, г. Екатеринбург;

Коновалов А.В., д.т.н., профессор, заведующий лабораторией механики деформации Института машиноведения УрО РАН, г. Екатеринбург.

Работа поступила в редакцию 24.08.2012.