Analysis of Thermal Stresses in Layered Composite AD1 + Cr20Ni80 + M1 After Heat Treatment

摘要

The results of modeling of the influence of layers thickness of the Ni-Cr-Al composite on value of thermal stresses on its interlayer boundaries after diffusion annealing are presented. It is shown that the cooling of the AD1-Cr20Ni80 composite after annealing, which provides formation of a DZ at its interlayer boundary, consisting of three interlayers (CrAl_(7), NiAl_(3) + CrAl_(7 )and Ni_(2)Al_(3) + CrAl_(7)), leads to spontaneous separation of the aluminum layer,due to the action of tensile stresses, exceeding the zone strength of the interlayer boundaries (CrAl_(7)) - (NiAl_(3) + CrAl_(7)), and at ik 0.3 - (NiAl_(3) + CrAl_(7)) - (Ni_(2)Al_(3) + CrAl_(7)) with the ratio of layers thickness of aluminum and the alloy Cr20Ni80 - ik 0.3, which leads to the formation of layered Cr20Ni80 / ( Ni_(2)Al_(3) + CrAl_(7)) / (NiAl_(3) + CrAl_(7)) or Cr20Ni80 / (Ni_(2)Al_(3) + CrAl_(7)) coatings.