PIP/LQ复合工艺对炮钢材料性能的影响

doi:10.13251/j.issn.0254-6051.2025.02.048

摘要/Abstract

摘要： 针对炮钢材料25Cr3Mo3NiNbZr钢,结合可控离子渗入(Programable ion permeation, PIP)与激光淬火(Laser quenching, LQ)两种工艺优势进行复合处理以提升其表面性能。试验材料经调质预处理后,先进行PIP处理,再以不同扫描速度进行激光淬火。通过金相观察、XRD分析、显微硬度测试、电化学腐蚀以及中性盐雾试验等方法表征试样性能。结果表明,在2.31~3.00 J/mm²的激光能量密度扫描下,部分化合物层发生了分解,降低了表面硬度;扩散层生成含氮马氏体,次表层硬度峰值得到提高。激光扫描速度为39 mm/s(激光能量密度为2.31 J/mm²)时工艺最佳,此时组织细化,含氮马氏体转变较多,表层氮化物损失较少,有效缓解“蛋壳效应”。PIP/LQ复合工艺处理试样的耐腐蚀性能虽低于PIP处理试样,但仍高于未处理试样,因此,PIP/LQ复合工艺在提高炮钢材料表面性能方面具有可行性。

关键词: 25Cr3Mo3NiNbZr钢, 可控离子渗入技术(PIP), 激光淬火(QL), 硬度, 耐腐蚀性

Abstract: A composite treatment combining the advantages of two processes, PIP (Programable ion permeation) and laser quenching (LQ) for the gun steel material 25Cr3Mo3NiNbZr steel was performed to enhance its surface properties. After pretreatment of quenching and tempering, the tested steel was treated with PIP followed by laser quenching at different scanning speeds. Properties of the specimens were characterized by metallographic observation, XRD analysis, microhardness test, electrochemical corrosion and neutral salt spray test. The results show that scanned at the laser energy density of 2.31-3.00 J/mm², part of the compound layer decomposes, reducing the surface hardness, nitrogen-containing martensite generates in the diffusion layer, and the peak hardness of the subsurface layer is improved. Laser scanning speed of 39 mm/s (laser energy density of 2.31 J/mm²) is determined for the optimum process, when scanned at this speed, the microstructure is refined, more nitrogen-containing martensite transforms, less nitrides lose in the surface layer, and the eggshell effect is effectively alleviated. The corrosion resistance of the PIP/LQ composite process treated specimens is lower than that of the PIP treated specimens but still higher than that of the untreated specimens. It is concluded that the PIP/LQ composite process is feasible to improve the surface properties of gun steel.

Key words: 25Cr3Mo3NiNbZr steel, programable ion permeation(PIP), laser quenching(QL), hardness, corrosion resistance

中图分类号:

TG156.8⁺2

罗乙淞, 王方舟, 祝伟, 陈甥怡, 罗德福. PIP/LQ复合工艺对炮钢材料性能的影响[J]. 金属热处理, 2025, 50(2): 298-303.

Luo Yisong, Wang Fangzhou, Zhu Wei, Chen Shengyi, Luo Defu. Influence of PIP/LQ composite process on properties of gun steel[J]. Heat Treatment of Metals, 2025, 50(2): 298-303.

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