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首页> 外文会议>Italian Group of Fracture Conference >Creep behaviour of 15-15Ti(Si) austenitic steel in air and in liquid lead at 550°C
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Creep behaviour of 15-15Ti(Si) austenitic steel in air and in liquid lead at 550°C

机译：在550°C的空气中和液体引线中15-15ti（Si）奥氏体钢的蠕变行为

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This work aims at studying the creep behaviour of 15-15Ti(Si) austenitic steel, under uniaxial stress and its interaction with liquid lead. Creep tests were performed at 550°C in an engineering stress range of 300-560 MPa. The 15-15Ti(Si) stainless steel is one of the best candidates for the nuclear reactor components of IV generation Lead-cooled fast reactor (LFR) and was tested in air and in stagnant liquid lead to simulate its behaviour in operating thermal and mechanical stress conditions and to verify its sensitivity to Liquid Metal Embrittlement (LME). Only few data can be found in the literature on 15-15Ti(Si) characterization, therefore the performed tests provided important information to use this material in the nuclear field, allowing to obtain the characteristic curve simulating the creep behaviour in air at all stress values, based on the Norton law and experimental data. The results of the specimens in air were compared with those obtained in lead, providing important information on creep corrosion: the liquid metal embrittlement effect takes place in lead and it produces a decrease of creep-rupture time, a reduction of creep strain and then the loss of steel ductility. Moreover, Scanning Electron Microscope (SEM) micrographs highlighted that lead changes both the mode and the type of specimen fracture. In addition, it was analyzed the lead action time, as the time after which the corrosion appears with macroscopic effects. These tests are still in progress: up to the current value of time (800h), they showed similar creep behaviour of the specimens tested in air and in lead. It can be assumed that liquid metal embrittlement takes place after a long time of steel/lead contact. However, since these tests are ongoing, these results will be object of our future studies.
机译：这项工作旨在研究15-15Ti（Si）奥氏体钢的蠕变行为，单轴应力及其与液体铅的相互作用。蠕变试验在550℃下在300-560MPa的工程应力范围内进行。 15-15Ti（Si）不锈钢是IV生成铅冷却的快速反应器（LFR）的核反应堆组分的最佳候选者之一，并在空气中测试并在停滞液中进行，以模拟其在操作热和机械中的行为压力条件并验证其对液态金属脆化（LME）的敏感性。在文献中只有很少的数据在15-15Ti（Si）表征中，因此所执行的测试提供了在核领域中使用这种材料的重要信息，从而获得在所有应力值中模拟空气中的蠕变行为的特征曲线，基于诺顿法和实验数据。将样品中标本的结果与铅获得的那些进行比较，提供有关蠕变腐蚀的重要信息：铅在铅中发生液体金属脆化效果，并且它产生蠕变破裂时间的减少，减少蠕变菌株，然后减少钢延性丧失。此外，扫描电子显微镜（SEM）显影突出显示，铅改变样品骨折的模式和类型。此外，分析了铅动作时间，因为腐蚀在宏观效应中出现腐蚀的时间。这些测试仍在进行中：达到当前时间（800h）的值，它们显示出在空气中测试的标本的类似蠕变行为。可以假设在长时间的钢/铅接触后发生液态金属脆化。但是，由于这些测试正在进行中，这些结果将是我们未来研究的对象。

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