Changes of structure and crystallographic texture of cladding tubes from austenitic steel under thermal creep testing

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Perlovich, Yu^1 ; Isaenkova, M.^1 ; Fesenko, V.^1 ; Dobrokhotov, P.^1 ; Tselishchev, A.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway, 31, Moscow

115409, Russia^1

关键词: Axial direction;    Cladding tubes;    Crystallographic textures;    Dislocation slip;    Elevated temperature;    Texture analysis;    Texture components;    Thermal-creep tests;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012007/pdf
DOI  :  10.1088/1757-899X/130/1/012007

来源: IOP

【 摘 要 】

The process of changes in structure and crystallographic texture of cladding tubes from austenitic steel ChS68 under thermal creep testing were studied. Testing of tubes was conducted at the temperature 700oC in the air by their stretching in axial direction under the stress 160 MPa until rupture. By data of phase and texture analysis a number of processes, accompanying plastic deformation of tubes during thermal creep tests at elevated temperature, were identified. The main texture components of original tube, as well as texture components of different parts of the tested tube are {110} and {112}. In the rupture zone the component of the texture of tension with axisalong the tube axis becomes stronger. This effect is connected with activation of dislocation slip in the deformed area of tested tube near the new-formed neck. At the same time the character of texture changes in the zone of tube rupture indicates to development of the dynamic recrystallization, conditioned by the total influence of all factors, which control the passage in the tube of thermal creep. In addition, it was revealed the activation of martensitic transformations in the zone of maximal deformation of tube as a result of its creep tests.