利用氨的激光振动激发增强 38CrMoAl 钢的氮化效果

Lisha Fan, Yifeng Lv, Ling Wu, Shuowen Zhang, Tingbin Wang, Fan Liu, Xiaoyu Ding, Jianhua Yao
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引用次数: 0

摘要

气体氮化是一种热化学表面硬化工艺,在工业中应用广泛,但存在氨(NH3)分解率低和加工周期极长的问题。为了提高气体氮化的效率,在 38CrMoAl 钢的气体氮化中引入了 NH3 的激光振动激发。通过将激光波长与 NH3 的 N-H 波动模式相匹配,激光能量可以优先沉积到 NH3 分子中,并促进其解离。氮化 38CrMoAl 钢板的形态、成分和机械性能在很大程度上取决于氮化时间的长短。随着氮化时间的延长,氮化表面经历了从含 N 的 α-Fe 固溶体到 γ′-Fe4N 再到 ε-Fe2~3N 的相变过程。与不使用激光氮化的 38CrMoAl 板材(6.3 wt pct 和 811 HV0.1)相比,使用 NH3 激光振动激发氮化 6 小时的 38CrMoAl 板材具有更高的氮含量(7.1 wt pct)和更硬的表面(944 HV0.1)。研究认为,激光振动激发 NH3 是促进氮扩散动力学和缩短气体氮化氮化周期的有效方法,在气体氮化的发展中大有可为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhanced Nitriding of 38CrMoAl Steels with Laser Vibrational Excitation of Ammonia

Enhanced Nitriding of 38CrMoAl Steels with Laser Vibrational Excitation of Ammonia

Gas nitriding is a thermochemical surface hardening process that is widely used in industry but suffers from a low decomposition rate of ammonia (NH3) and extremely long processing cycles. To enhance the gas nitriding efficiency, laser vibrational excitation of NH3 is introduced into the gas nitriding of 38CrMoAl steels. By matching the laser wavelength with the N–H wagging mode of NH3, laser energy can be preferentially deposited into NH3 molecules and facilitates their dissociation. The morphology, composition, and mechanical properties of nitrided 38CrMoAl plates strongly depend on the nitriding time length. Nitrided surfaces experience phase transition from α-Fe solid solution with N through γ′-Fe4N to ε-Fe2~3N phase as prolonging the nitriding time length. A 38CrMoAl plate nitrided with laser vibrational excitation of NH3 for 6 hours possesses a higher nitrogen content (7.1 wt pct) and a harder surface (944 HV0.1) than that nitrided without laser (6.3 wt pct, and 811 HV0.1). The study concludes that laser vibrational excitation of NH3 is an effective way to promote nitrogen diffusion kinetics and shorten the nitriding cycle of gas nitriding, which holds great promise in the development of gas nitriding.

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