论文部分内容阅读
采用磁感应强度测量仪、奥氏体氧化物检测仪、光学显微镜、扫描电镜、透射电镜和X射线衍射仪等仪器对较高磁性的S30432高温过热器管进行了取样对比试验研究.结果表明:新管无磁当量和磁感应强度,服役1.9×105 h的运行管出现了较高的磁当量和磁感应强度,磁当量和磁感应强度在管子环向变化较大,服役时间长的管子的磁当量显著大于服役时间短的;引起运行管出现高磁性的原因是管子室温组织中存在一定量的马氏体,马氏体组织呈条带状分布在紧邻晶界两侧,服役时间长的管子中马氏体组织的量明显多于服役时间短的;与新管相比,S30432运行管组织中弥散分布在晶内ε-Cu相的尺寸明显增大、形态也由不规则转变为圆形颗粒.
A comparative study on the sampling and comparison of the high magnetic superheater tubes S30432 was carried out by using magnetic induction measuring instrument, austenite oxide detector, optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffractometer. The results show that: The magnetic equivalent and magnetic induction intensity of the tube with service life of 1.9 × 105 h appeared higher magnetic equivalent and magnetic flux density. The magnetic equivalent and magnetic flux density changed greatly in the circumferential direction of the tube. The magnetic equivalent of the long service tube was significantly larger than Service time is short; caused by the emergence of high magnetic tube reason is that there is a certain amount of martensitic tube tissue at room temperature, martensite was strip-like distribution in the immediate vicinity of the grain boundary, long service life of the tube Markov Compared with the new tube, the size of the ε-Cu phase dispersed in the microstructure of S30432 tube significantly increased and the morphology changed from irregular to round particles.