42CrMo钢的钛催渗等离子渗氮工艺

doi:10.13251/j.issn.0254-6051.2023.05.039

摘要/Abstract

摘要： 研究了不同渗氮时间下钛元素对42CrMo钢常规离子渗氮工艺的作用效果,表征分析了不同渗氮工艺下试样表面的渗层组织及性能。结果表明,钛催渗离子渗氮试样的表面硬度和渗层深度均明显高于常规离子渗氮。在535 ℃×3 h的工艺条件下,钛催渗离子渗氮试样渗层的表面硬度达到887.4 HV0.2,渗氮层厚度约为400 μm。钛元素的加入促进了氮元素的渗透和扩散,在试样表面生成高硬度化合物TiN。相较于相同保温时间下的常规离子渗氮,钛催渗离子渗氮试样表面硬度提高了60 HV0.2,渗层厚度增加了80 μm,渗氮效率提升了约25%。与常规离子渗氮相比,钛催渗离子渗氮工艺具有显著优势,不仅有利于改善渗层组织性能,增强渗氮效果,还提高了渗氮效率,使渗氮周期明显缩短。

关键词: 42CrMo钢, 钛催渗等离子渗氮, 显微组织, 硬度

Abstract: Effect of titanium on conventional plasma nitriding process of 42CrMo steel under different nitriding time was studied. The microstructure and hardness of the nitrided layers on specimen under different nitriding processes were characterized and analyzed. The results show that the surface hardness and nitrided layer depth of the titanium-catalyzed plasma nitrided specimen are obviously higher than those of the conventional plasma nitrided specimen. Under the process condition of 535 ℃×3 h, the surface hardness and the depth of the nitrided layer reach 887.4 HV0.2 and 400 μm, respectively. The addition of titanium promotes the infiltration and diffusion of nitrogen, and generates high hardness compound TiN on the surface. Compared with the conventional plasma nitriding under the same nitriding time, the surface hardness and the depth of the nitrided layer are increased by 60 HV0.2 and by 80 μm, respectively, and the nitriding efficiency is increased by about 25%. The titanium-catalyzed plasma nitriding process has more significant advantages than conventional plasma nitriding, which not only improves the microstructure and hardness of the nitrided layer, enhances the nitriding effect, but also improves the nitriding efficiency and significantly shortens the nitriding cycle.

Key words: 42CrMo steel, Ti-catalyzed plasma nitriding, microstructure, hardness

中图分类号:

TG156.82

钟厉, 王佐钰, 门昕皓, 韩西. 42CrMo钢的钛催渗等离子渗氮工艺[J]. 金属热处理, 2023, 48(5): 252-258.

Zhong Li, Wang Zuoyu, Men Xinhao, Han Xi. Ti-catalyzed plasma nitriding process of 42CrMo steel[J]. Heat Treatment of Metals, 2023, 48(5): 252-258.

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