VESTNIK of Samara University. Aerospace and Mechanical EngineeringVESTNIK of Samara University. Aerospace and Mechanical Engineering2542-04532541-7533Samara National Research University251310.18287/1998-6629-2014-0-5-2(47)-82-87UnknownThe influence of maximum temperature of heating on the thermal fatigue of nickel heat-resistant alloys under thermocyclic testsTikhomirovaE. A.<p>Candidate of Science (Engineering)</p>
<p>Engineer</p>tixomirova00@mail.ruSidokhinE. F.<p>Engineer</p>esidohin@yandex.ruJSC “KLIMOV”, S.-PeterburgJoint-Stock Company «KB X-ray Instruments», Saint-Petersburg21122014135-282872206201522062015Copyright © 2015, VESTNIK of the Samara State Aerospace University2015<p>The analysis of high temperature resistance alloys thermocyclic tests show that the lifetime Np is less whenmaximum temperature Тmax in test cycles (Т=Тmax-Тmin) is more 900С. In most test cases thermal cycle contentsthe plastic deformation. The cooling half-cycle includes three temperature intervals: first where heating halfcyclecompression stress decrease take place, second where tension stresses are increased to yield stress 02 andplastic deformation begin, and third interval - plastic deformation region, which is finished at minimum temperatureof cycle Тmin. The stress decrease interval length depends from value of stress, which is reached in precedeheating half-cycle and, as we consider, equal 02(Tmax). High temperature resistance alloys are characterized byyield stress 02 sharp decrease at temperatures which is more 900С. Because at cooling from temperatures, whichis lower 900С, stresses, which must to decrease, are larger on one third them at 1000С and on half them at1100С. Therefore third temperature interval is shorter at cooling from temperature which is more 900С, plasticdeformation is more and lifetime NP smaller.</p>Thermal deformationelastic-plastic deformationthermal fatigueДолговечностьполуцикл испытанийпредел текучести[1. Dulnev R.A., Kotov P.I. Termicheskaya ustalost metallov [Thermal fatigue of metals] Moscow: Mashinostroenie Publ., 1980. 200 p.][2. Rozenberg V.M. Polzuchest metallov [Creep of metals] Moscow: Metallurgiya Publ., 1967. 242 p.][3. Shalin R.E., Svetlov I.L., Kachanov E.B., Toloraiya V.N., Gavrilin E.B. Monokristally nikelevykh garoprochnykh splavov [Single crystals of base-Ni superalloys]. Moscow: Mashinostroenie Publ., 1997. 336 p.][4. Gecov L.B., Rubnikov A.I., Semenov A.S., Grigorev A.V., Tikhomirova E.A. The deformation resistance and fracture of single crystals at static and thermal-cyclic tests // Nadezhnost’ i Bezopasnost’ Energetiki. 2012. No. 3(18). P. 53-62. (In Russ.)][5. Gecov L.B., Rubnikov A.I., Semenov A.S. Material development deformation at thermal-cyclic tests // Trudy NPO CKTI «Prochnost materialov I resurs elementov energooborudovaniya. V. 296. SPb.: NPO TsKTI Publ., 2009. P. 105-119. (In Russ.)][6. Golubovskiy E.R., Bychkov N.G., Khamidullin A.Sh., Bazyleva O.A. The experimental estimation of thermal fatigue crystallographic anisotropy of Ni3Al singlecrystals for high- temperature details of AGTD // Vestnik dvigatelestroeniya. 2011. No. 2. P. 244-248. (In Russ.)][7. Tikhomirova E.A., Azizov T.N., Sidokhin E.F. The influence of high temperature stand on heat resistance alloys thermal fatigue // Tekhnologiya metallov. 2013. No. 6. P. 34-37. (In Russ.)]