Abstract

Mechanical properties of the metal from drums of boilers at the Starobeshevskaya and the Lugansk thermal power plants (TPPs) were investigated. According to the results of the standard technical diagnostics and a strength analysis, both drums comply with the applicable regulatory requirements. At the Starobeshevskaya TPP, the drum was ruptured during a hydraulic test. It was found that this was caused by the low impact strength of the metal at room temperature. The objects of the investigation were fragments of the ruptured drum and a “plug” cut out of the shell during a scheduled inspection. An attempt is made in this paper to assess the state of equipment metal based on the results of tests on subsize Charpy specimens. It has been demonstrated that when standard Charpy specimens (10 × 10 × 55 mm) cannot be made but impact bend tests have to be performed, the brittle-to-ductile transition temperatures for standard Charpy specimens may be obtained in testing 2 × 8 × 55 mm specimens. The correlation developed to relate the test results from subsize specimens to standard Charpy specimen enables us to assess in the first approximation the fitness for service of the metal to prolong the equipment’s service life. The rupture surface of subsize Charpy specimens has almost the same appearance as that of standard specimens. The temperature dependence of ductile component of subsize specimens agrees well with the corresponding dependence for standard Charpy specimens. To integrate the test data into a single database, it is desirable to derive a correlation to relate the critical brittleness temperature from a subsize specimen test to the critical brittle temperature from standard Charpy specimens.

中文翻译：

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使用超大夏比试样研究热电厂长期运行后钢桶中的金属

摘要

研究了 Starobeshevskaya 和 Lugansk 热电厂 (TPP) 锅炉汽包金属的机械性能。根据标准技术诊断和强度分析的结果，两个鼓均符合适用的法规要求。在 Starobeshevskaya TPP，滚筒在液压试验期间破裂。发现这是由于金属在室温下的低冲击强度造成的。调查对象是在定期检查期间破裂的鼓的碎片和从外壳上切下的“塞子”。本文尝试根据对小尺寸夏比试样的测试结果来评估设备金属的状态。已经证明，当标准夏比试样（10 × 10 × 55 mm）不能制作而必须进行冲击弯曲试验时，标准夏比试样的脆韧转变温度可通过试验获得 2 × 8 × 55 毫米试样。将小尺寸试样的测试结果与标准夏比试样相关联的相关性使我们能够初步评估金属的适用性，以延长设备的使用寿命。小尺寸夏比试样的破裂面与标准试样的外观几乎相同。小尺寸试样的韧性成分的温度依赖性与标准夏比试样的相应依赖性非常吻合。要将测试数据集成到单个数据库中，