학술논문
Stress-induced Martensitic Transformation During Tensile Test of Full-size TF Conductor Jacket Tube at 4.2 K.
Document Type
Article
Author
Source
Subject
*MARTENSITIC transformations
*TUBES
*TENSILE tests
*STRAINS & stresses (Mechanics)
*HEAT treatment of metals
*STAINLESS steel
*TOROIDAL magnetic circuits
*ELECTROMAGNETIC forces
*SUPERCONDUCTORS
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Language
ISSN
0094-243X
Abstract
The toroidal-field (TF) conductor jacket of International Thermonuclear Experimental Reactor (ITER) is made of modified 316LN stainless steel, which is influenced by heat treatment at approximately 650 ℃ for 200 h to produce Nb3Sn superconducting materials at the final stage. Due to the high electromagnetic forces arising during magnet operation, higher mechanical properties of the jacket materials at cryogenic temperatures are required. In our work, mechanical properties of the full-size TF conductor jacket tube were investigated, which satisfied the ITER requirements. Stress-induced martensitic transformation mechanism during tensile test of the conductor jacket material at 4.2 K was characterized by means of in-situ temperature dependent XRD, vibrating sample magnetometer (VSM) and in conjunction with transmission electron microscopy (TEM). The tensile behavior related to the amount of stress-induced phase transformation at cryogenic temperature was also discussed. [ABSTRACT FROM AUTHOR]