CAJ | 학술논문

针对690合金应力腐蚀问题，在核电一回路模拟环境中，采用恒载荷和慢应变速率拉伸实验方法，研究了690合金的应力腐蚀开裂行为，并通过扫描电镜、能谱分析和X射线衍射方法对表面形貌、截面形貌和断口形貌进行观察与分析。扫描电镜结果表明，样品表面被颗粒状腐蚀产物所覆盖，成分主要为Fe、Ni、Cr的尖晶石氧化物；表面状态对表面腐蚀形貌影响较大；690合金恒载荷试样经历2100 h腐蚀试验后未发生应力腐蚀开裂；拉伸试样表现出低的应力腐蚀敏感性，断口形貌为韧性断口和脆性断口的混合模式。
침대690합금응력부식문제，재핵전일회로모의배경중，채용항재하화만응변속솔랍신실험방법，연구료690합금적응력부식개렬행위，병통과소묘전경、능보분석화X사선연사방법대표면형모、절면형모화단구형모진행관찰여분석。소묘전경결과표명，양품표면피과립상부식산물소복개，성분주요위Fe、Ni、Cr적첨정석양화물；표면상태대표면부식형모영향교대；690합금항재하시양경력2100 h부식시험후미발생응력부식개렬；랍신시양표현출저적응력부식민감성，단구형모위인성단구화취성단구적혼합모식。
The stress corrosion cracking ( SCC) behavior of alloy 690 in primary water was investigated using the static load test and slow strain rate test. The surface, cross section and fracture morphology were analyzed by using scanning electron microscopy ( SEM) , energy dispersive spectrometer ( EDS) and X-ray diffraction. The results of the SEM showed that the surface is uniformly covered by corrosive oxide particles. The corrosion product mainly consists of spinel oxides of Fe, Ni and Cr. The surface condition has great effect on the corro-sion morphology. After a 2100 hours corrosion test in primary water, no significant SCC was observed in the static load specimens of alloy 690. The slow strain specimens have low susceptibility to SCC in primary water. The fracture morphology was the mixed mode of the ductile fracture and the brittle fracture.