Li Qing, Cheng Guangxu, Qin Mu, Wang Yafei, Zhang Zaoxiao
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Materials (Basel). 2021 Feb 13;14(4):891. doi: 10.3390/ma14040891.
The carbide characteristics of 2.25Cr1Mo0.25V steel have an extremely important influence on the mechanical properties of welding joints. In addition, hydrogen resistance behavior is crucial for steel applied in hydrogenation reactors. The carbide morphology was observed by scanning electron microscopy (SEM) and the carbide microstructure was characterized by transmission electron microscopy (TEM). Tensile and impact tests were carried out and the influence of carbides on properties was studied. A hydrogen diffusion test was carried out, and the hydrogen brittleness resistance of welding metal and base metal was studied by tensile testing of hydrogenated samples to evaluate the influence of hydrogen on the mechanical properties. The research results show that the strength of the welding metal was slightly higher and the Charpy impact value was significantly lower compared to the base metal. The hydrogen embrittlement resistance of the welding metal was stronger than that of the base metal. The presence of more carbides and inclusions was the main cause of the decreased impact property and hydrogen brittleness resistance of the welding metal. These conclusions have certain reference value for designing and manufacturing hydrogenation reactors.
2.25Cr1Mo0.25V钢的碳化物特性对焊接接头的力学性能有着极其重要的影响。此外，抗氢性能对于应用于加氢反应器的钢材至关重要。通过扫描电子显微镜（SEM）观察碳化物形态，并用透射电子显微镜（TEM）表征碳化物微观结构。进行拉伸和冲击试验，研究碳化物对性能的影响。开展氢扩散试验，通过对氢化试样进行拉伸试验研究焊接金属和母材的抗氢脆性能，以评估氢对力学性能的影响。研究结果表明，与母材相比，焊接金属的强度略高，夏比冲击值显著较低。焊接金属的抗氢脆性能强于母材。较多碳化物和夹杂物的存在是焊接金属冲击性能和抗氢脆性能下降的主要原因。这些结论对加氢反应器的设计和制造具有一定的参考价值。
