オーステナイト系ステンレス鋼JJ1極厚共金溶接材の極低温破壊靱性及び発熱・温度上昇

概要

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JJ1 type austenitic stainless steel is emerging as the preferred structural material for superconducting magnet casings to operate at liquid helium temperature (4K). In order to evaluate the cryogenic fracture toughness and the temperature rise of tangsten inertgas (TIG) weld in 200 mm thick forged JJ1 type austenitic stainless steel plate for fusion reactor magnets of the next generation, elastic-plastic fracture toughness (J_<IC>) tests were performed with 1T compact tension specimens at 4K. Testing was conducted in accordance with ASTM standards E813-87 for determining J_<IC> using the unloading compliance technique to monitor crack growth. Au/0.07% Fe-Chromel thermocouples were used to measure the temperature rise near the crack tip. The effects of specimen location and nitrogen content on J_<IC> are examined. Specimens were subjected to scanning electron microscopy (SEM) after fracture testing. The effect of inclusion content on the elastic-plastic fracture toughness parameters (J_Q, J_<IC>) is also discussed using optical microscopy and energy dispersive X-ray spectrometer (EDX).
社団法人溶接学会の論文
1997-05-05