《Table 1.Chemical composition of the investigated pipe wt》

《Table 1.Chemical composition of the investigated pipe wt》   提示:宽带有限、当前游客访问压缩模式
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《Effect of long-term service on the precipitates in P92 steel》


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The material used for this study is a hot reheat steam pipe of a USC boiler with an internal diameter of 502 mm and wall thickness of 32 mm;it has been in service for 9854 h at a temperature of 603°C and a pressure of 5.87 MPa.The pipe was initially normalized at 1070°C and subsequently tempered at 770°C;its chemical composition is given in Table 1.Metallographic specimens were cut from the pipe and were chemically etched in a solution of 5 g of iron(III)chloride in 100 m L of distilled water mixed with 50 m L of concentrated hydrochloric acid.These samples were then examined by Zeiss Supra 55 field-emission scanning electron microscopy(FESEM).Thin foils and extraction carbon replicas were prepared by the twin-jet electropolishing technique in an electrolyte of 5vol%perchloric acid+95vol%ethanol with a current of 25–30 m A at-30°C and by the method described in the literature[26].They were then observed in a JEM-2100 transmission electron microscope operated at 200 k V.The precipitate phases were identified by energy-dispersive X-ray spectrometry(EDS)and selected-area electron diffraction(SAED),and their sizes were measured from transmission electron microscopy(TEM)micrographs using the Image-Pro Plus software.