CAJ | 학술논문

制定适用的超临界水堆堆芯冷却剂水化学运行和控制方式是确保其进入工业应用的重要基础。由于超临界水在中子辐照下具有强腐蚀性,容易诱发材料氧化和应力腐蚀开裂问题,奥氏体不锈钢作为超临界水堆构件的候选材料之一,但其应力腐蚀行为与环境水质密切相关,研究水质对该候选材料在超临界条件下的影响规律对材料选择甚至冷却剂水化学方案的确立有重要影响。本文对HR3C不锈钢在620℃,25MPa中性加氧水中的应力腐蚀行为进行了试验研究,分析了溶解氧浓度对应力腐蚀开裂行为的影响,结果表明超临界加氧水条件下HR3C晶粒组织长大并析出相,构成沿晶开裂初始条件并扩展为沿晶应力腐蚀开裂。
제정괄용적초림계수퇴퇴심냉각제수화학운행화공제방식시학보기진입공업응용적중요기출。유우초림계수재중자복조하구유강부식성,용역유발재료양화화응력부식개렬문제,오씨체불수강작위초림계수퇴구건적후선재료지일,단기응력부식행위여배경수질밀절상관,연구수질대해후선재료재초림계조건하적영향규률대재료선택심지냉각제수화학방안적학립유중요영향。본문대HR3C불수강재620℃,25MPa중성가양수중적응력부식행위진행료시험연구,분석료용해양농도대응력부식개렬행위적영향,결과표명초림계가양수조건하HR3C정립조직장대병석출상,구성연정개렬초시조건병확전위연정응력부식개렬。
One of key issues during development of Supercritical Water Cooled Reactor (SCWR) is selection of water chemistry operating specifications for core coolant and related system. The ultra high temperature and pressure in the core increases stress corrosion cracking (SCC) sensitivity of cladding and structure materials, which brings a challenge to the materials screening. Austenitic stainless steel is hopeful for low corrosion rate and low cost. However, austenitic stainless steel wil experience SCC failures in supercritical water and be influenced by water quality. In this paper the SCC behaviors of austenitic stainless steel in supercritical water with different dissolved oxygen content was studied. The test data and mechanism is investigated for the effect of oxygen on the sensitivity of SCC at 620℃and 25MPa.