ジルカロイ-2/SUS316Lステンレス鋼の摩擦圧接継手の性能評価

Performance evaluation of friction welded joint of zircaloy-2 to type 316L stainless steel

北岸 茂  ; 斎藤 隆; 菊地 泰二; 遠藤 泰一; 土谷 邦彦 

Kitagishi, Shigeru; Saito, Takashi; Kikuchi, Taiji; Endo, Yasuichi; Tsuchiya, Kunihiko

材料試験炉(JMTR)で実施する燃料照射試験のための照射キャプセルの技術開発の一環として、摩擦圧接法によるジルカロイ-2(Zry-2)/SUS316L継手の製作性試験を行い、接合条件を決定するとともに、接合界面の特性評価及び継手性能を評価した。まず、摩擦時間を変更した継手の機械的特性の影響を明らかにした。次に、その接合条件で製作した継手について、断面マクロ観察,元素分析及び硬さ分布測定を行い、継手の接合界面部の熱影響及び元素分布を明らかにした。また、高温引張試験,ヘリウム漏れ試験及び水圧バースト試験を行い、燃料照射試験で使用する条件における継手の健全性を明らかにした。

The development of the friction welded joint between Zircaloy-2 (Zry-2) and Type 316L stainless steel (SUS316L) has been carried out for the fabrication of fuel irradiation capsules in Japan Materials Testing Reactor (JMTR). The welding condition was determined from the fabrication test results of total loss and tensile strength. The joint interface was characterized by metallographic observation, elemental analysis and micro-hardness test. It was found that heat-affected zones at the joint interface were different between the center and outside positions. The tensile strength of the joint was equal to that of base Zry-2 metals at 300C. And, the joint performance was good from the results of helium leak test and hydraulic pressure burst test. From the results of these tests, it was obvious that the Zry-2/SUS316L friction welded joints were promised to use for the structural material of irradiation capsules for fuel irradiation tests.