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研究了中温抗氢钢125Cr—05Mo的回火析出相及其对抗氢蚀能力的影响.碳萃取复型的透射电镜观察显示，随回火温度升高，碳化物析出量增加，颗粒粗化.520和620℃回火析出物几乎全部为M3C;670℃回火析出物以M3C为主并含有少量M23C6；710℃回火主要析出M23C6，包含少量的M3C．扫描电镜观察表明，充氢之后，经620℃回火的试样发生了严重的氢腐蚀，并导致强度和硬度的大幅度下降；经520℃回火的试样在充氢后抗拉强度值下降较多；670和710℃回火试样的各项力学性能变化不大，表现了良好的抗氢蚀能力.620℃回火时沿晶界析出大量不稳定的M3C，以及在碳化物转化过程中出现的富C贫Cr区域，导致材料的氢蚀破坏.
The effects of tempering precipitated phase on the corrosion resistance of hydrogen-resistant steel 125Cr-05Mo and its resistance to hydrogen erosion were studied.The transmission electron microscopy (TEM) observations of the carbon-extracted complex showed that the amount of carbides precipitated increased with the tempering temperature increasing. Temperatures at 520 and 620 ℃ are almost all of M3C; tempered deposits at 670 ℃ are dominated by M3C and contain a small amount of M23C6; tempered at 710 ℃ mainly precipitates M23C6, including a small amount of M3C. Scanning electron microscopy showed that after hydrogen charging, the samples tempered at 620 ℃ experienced serious hydrogen corrosion and led to a sharp decrease in strength and hardness. The tensile strength after hydrogenation at 520 ℃ The mechanical properties of the specimens tempered at 670 ℃ and 710 ℃ did not change much and showed good resistance to hydrogen erosion.A large amount of unstable M3C precipitated along the grain boundary at 620 ℃ and the carbide- The C-rich and lean regions that appear during the process lead to hydrogen erosion of the material.