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采用700℃不同时间的等温处理,模拟了2(1/4)Cr-1Mo钢焊接接头高温长期服役的实际运行情况。用光镜和透射电镜对焊缝和母材的碳化物分布和形态进行了研究,并用X射线物相分析法对母材的碳化物类型进行了鉴定。结果表明,随着模拟时间的延长,碳化物不断向晶界聚集长大,其类型由Fe_3C逐渐转变为Mo_2C、(Cr,Fe)_7C_3和Cr_(23)C_6。
The isothermal treatment at 700 ℃ for different time simulated the actual operation of long service life of 2 (1/4) Cr-1Mo steel welded joints at high temperature. The distribution and morphology of the carbides in the weld and the base metal were studied by light microscopy and transmission electron microscopy. The carbide types of the base metal were identified by X-ray phase analysis. The results show that with the extension of the simulation time, carbides continue to aggregate and grow into grain boundaries, and their types gradually change from Fe 3 C to Mo 2 C, (Cr, Fe) 7 C 3 and Cr 23 C 6.