CAJ | 학술논문

材料问题尤其是燃料包壳材料是超临界水堆的两大难题之一。文中以包壳候选材料之一镍基合金C276为研究对象，对其在600-750℃／130-500MPa条件下进行高温蠕变试验，考察温度和应力对蠕变过程的影响；分析稳态蠕变速率随应力和蠕变断裂时间的变化规律；揭示了蠕变断裂时问与应力间的关系；并比较了分别由Monkman-Grant经验公式和L．M参数法预测各温度的蠕变寿命的可靠性。结果表明：C276具有良好的高温蠕变性能，且600℃低应力水平及650-750℃下的稳态蠕变速率与所施加的应力在双对数坐标系下呈较好的线性关系，但在600℃高应力水平下偏离了这种线性关系。
재료문제우기시연료포각재료시초림계수퇴적량대난제지일。문중이포각후선재료지일얼기합금C276위연구대상，대기재600-750℃／130-500MPa조건하진행고온연변시험，고찰온도화응력대연변과정적영향；분석은태연변속솔수응력화연변단렬시간적변화규률；게시료연변단렬시문여응력간적관계；병비교료분별유Monkman-Grant경험공식화L．M삼수법예측각온도적연변수명적가고성。결과표명：C276구유량호적고온연변성능，차600℃저응력수평급650-750℃하적은태연변속솔여소시가적응력재쌍대수좌표계하정교호적선성관계，단재600℃고응력수평하편리료저충선성관계。
One of the two challenges about supercritical water reactor is material, especially for the fuel cladding. High temperature creep tests of Nibased alloy C276, one of the candidate materials for the fuel cladding, were carried out at 600-750℃, with stress 130-500MPa. The effects of temperature and stress on creep were investigated, the change laws of the steady state creep rate with stress and time to rupture were analysed, the relations between time to rupture and stress were revealed, and the rupture reliability predicted by Monkman Grant formula and L-M method respectively was compared. The results show that C276 has prominent creep property and a consistent linear relationship between the steady state creep rate and the applied stress in the logarithm coordinate system at 600 ℃ with low stress and 650-750 ℃, but deviating the linear relationship at 600℃ with high stress.