激光熔化沉积CrCoNi中熵合金的热腐蚀性能

doi:10.13229/j.cnki.jdxbgxb.20231069

摘要/Abstract

摘要：

针对激光熔化沉积制备的CrCoNi中熵合金进行了热腐蚀性能研究，解决了温度对中熵合金热腐蚀动力学、腐蚀形貌及产物影响规律的问题，得到了以下结果：成形合金的物相为FCC相，试样中包含少量的气孔和裂纹，显微组织为等轴胞状和柱状的混合枝晶亚结构。在700、900、1 100 ℃ 3种温度下热腐蚀速率k_p 分别为3.920 37×10^-4、0.002 36、0.005 49 mg²/（cm⁴·h），热腐蚀动力学曲线基本遵循抛物线定律。热腐蚀层产物为Cr₂O₃及少量的NiCr₂O₄和CoCr₂O₄尖晶石物相。在挥发性氯气和热应力共同作用下，腐蚀层会发生破坏剥落。研究结果对促进激光熔化沉积中熵合金在高温结构件领域的应用具有理论价值。

关键词: 机械工程, 激光熔化沉积, CrCoNi中熵合金, 热腐蚀, 腐蚀动力学

Abstract:

This work focuses on the hot corrosion performances of CrCoNi medium entropy alloy （MEA） prepared by laser melting deposition （LMD）， and solves the problem that affecting laws of temperature on the hot corrosion kinetics， corrosion morphology and product of MEA. The following results are obtained： the phase of the formed alloy is FCC phase， and the sample contains a small amount of pores and cracks. The microstructure is a mixed dendritic substructure of equiaxed cell and column dendrites. The hot corrosion rates k_p at three temperatures of 700，900 and 1 100 ℃ are 3.920 37×10⁴， 0.002 36， and 0.005 49 mg²/（cm⁴·h）， respectively. The hot corrosion rate increases with the increase of temperature at three different temperatures， and the hot corrosion kinetics curve basically follows the parabolic law； The corrosion layer products are Cr₂O₃ and a small amount of NiCr₂O₄ and CoCr₂O₄ spinel phases. Under the combined action of volatile chlorine gas and thermal stress， the corrosion layer will undergo damage and peeling. The research results have theoretical value for promoting the application of LMD-prepared MEA in high-temperature structural components.

Key words: mechanical engineering, laser melting deposition, CrCoNi medium entropy alloy, hot corrosion, corrosion kinetics

中图分类号:

TG139

王勇刚,刘和剑,王传洋,王磊,钱润东,李东亚,董逸君. 激光熔化沉积CrCoNi中熵合金的热腐蚀性能[J]. 吉林大学学报(工学版), 2025, 55(5): 1544-1551.

Yong-gang WANG,He-jian LIU,Chuan-yang WANG,Lei WANG,Run-dong QIAN,Dong-ya LI,Yi-jun DONG. Hot corrosion behaviors of CrCoNi medium entropy alloy by laser melting deposition[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(5): 1544-1551.

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区域	O	Cr	Co	Ni
Ⅰ	52.93	34.25	7.23	5.59
Ⅱ	45.75	38.62	5.85	9.78
Ⅲ	48.56	30.29	3.60	14.67
Ⅳ	53.77	16.78	12.56	16.89

区域	O	Cr	Co	Ni
1	51.38	40.36	3.29	4.97
2	32.79	6.89	30.96	29.36
3	38.95	36.24	8.13	16.68
4	48.32	37.95	7.39	6.34
5	40.26	23.51	18.61	17.62
6	45.38	38.61	10.64	5.37