VESTNIK of Samara University. Aerospace and Mechanical EngineeringVESTNIK of Samara University. Aerospace and Mechanical Engineering2542-04532541-7533Samara National Research University253610.18287/1998-6629-2014-0-5-3(47)-26-34UnknownAnalysis of the results of thermal cycic tests using TC-maps and problems of investigating thermal fatigue of materialsTikhomirovaE. 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-Petersburg22122014135-326340807201508072015Copyright © 2015, VESTNIK of the Samara State Aerospace University2015<p>We present a method for the analysis of the progress of the deformation within a cycle by constructing thediagram TC-maps, where presented dependences of the temperature free thermal deformation elastic deformation,corresponding to the flow limit of the material. The diagram shows the magnitude of the plastic deformationattained at the maximal temperature (Tmax) and its changes in the cycles. The diagram allows permits oneto choose the temperature mode required to obtain the desired deformation parameters in a test. An applicationof the diagram is presented in the case study analyzing the method and results of thermocyclic tests conducted onthe high-heat resistant alloy used for the construction of the blades in the VNKNA-1V turbines. It has been concludedthat under all possible modes the material is subject to plastic deformation within a cycle. Its presencedoes not allow one to conclude the dependence of the lifetime from the magnitude of the maximal stress registeredwithin a cycle.</p>Thermal fatigueplastic deformationthermo-cyclical testingТермическая усталостьтермоциклические испытанияпластическая деформация[1. Dulnev R.A., Svetlov I.L., Bychkov N.G., Rybina T.V., Sukhanov N.N., Gordeeva T.A., Dobrokhvalova E.N., Epishin A.I., Krivko A.I., Nazarova M.P. An orientation relationship of the thermal fatigue of nickel alloy single crystals // Strength of Materials. 1988. V. 20, no. 11. P. 1415-1421.][2. Dulnev R.A., Kotov P.I. Termicheskaya ustalost metallov [Thermal fatigue of metals] Moscow: Mashinostroenie Publ., 1980. 200 p.][3. Tretyachenko G.N., Karpinos B.S., Barilo V.G. Razrushenie materialov pri ciklicheskikh nagrevakh [The Material fracture at cyclic heats]. Kiev: Naukova dumka Publ., 1993. 288 p.][4. Coffin L.F. A Study of Cyclicthermal Stress in Ductile Metal // Journal of Pressure Vessel Technology, Transaction of the ASME. 1954. V. 76. P. 931-950.][5. Serensen S.V., Kotov P.I. About measuring of thermal fatigue resistance buy mean of the rigid load variation // Zavodskaya laboratoriya. 1962. V. 28, no. 10. P. 1233-1238. (In Russ.)][6. Tikhomirova E.A., Azizov T.N., Sidokhin F.A., Sidokhin E.F. About the thermal-cycle tests buy mean of the rigid load variation // Materialovedenie. 2014. No.7. P. 13-16. (In Russ.)][7. 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.)][8. Balandin Yu.F. Termicheskaya ustalost metallov v sydovom energomashinostroenii [Thermal fatigue of metals in ship energy machine-building]. Leningrad: Sudostroenie Publ., 1967. 272 p.][9. Manson S.S. Termicheskaie napryageniya i malociklovaya ustalost. [The temperature stresses and low-cycle fatigue]. Moscow: Mashinostroenie Publ., 1974. 213 p.][10. Tikhomirova E.A., Azizov T.N., Sidokhin E.F. Specifics of base-Ni superalloy single crystal deformation at thermal actions // Tekhnologiya metallov. 2013. No. 7. P. 14-18. (In Russ.)][11. 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.]