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首页> 外文期刊>Applied Surface Science >Surface Modification Of 30crnimo8 Low-alloy Steel By Active Screen Setup And Conventional Plasma Nitriding Methods
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Surface Modification Of 30crnimo8 Low-alloy Steel By Active Screen Setup And Conventional Plasma Nitriding Methods

机译：活性屏设置和常规等离子渗氮方法对30crnimo8低合金钢进行表面改性

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摘要

In this paper, we report on a comparative study of active screen plasma nitriding (ASPN) and conventional dc plasma nitriding (CPN) behavior of 30CrNiMo8 low-alloy steel that has been examined under various process conditions. The process variables included active screen setup parameters (screen and iron plate top lids placed on the screen setup with 8 mm of hole size), treatment temperature (550 and 580 ℃), gas mixture (75/25 and 25/75 of N_2/H_2) and treatment time (5 and 10 h) in 500 Pa pressure. The structure and phases composition of the diffusion zone and compound layer were studied by X-ray diffraction (XRD), microhardness tests, light optical microscopy and scanning electron microscopy (SEM). It was observed that treated sample surfaces in both CPN and ASPN methods consist of γ' and ε phases, and while the nitriding time and/or temperature increases, the intensity of ε phase in the compound layer will increase for ASPN and decrease for CPN method. Results show that the amount of nitrogen transferred from holes of screen toward the sample surface via sputtering and re-condensation mechanism can be affected due to the hardness and thickness of the layer.
机译：在本文中，我们报告了在各种工艺条件下对30CrNiMo8低合金钢进行的有源丝网等离子体氮化（ASPN）和常规直流等离子体氮化（CPN）行为的比较研究。工艺变量包括有效的筛网设置参数（筛板上的筛网和铁板顶盖，孔径为8 mm），处理温度（550和580℃），混合气体（N_2 /的75/25和25/75 H_2）和在500 Pa压力下的处理时间（5和10小时）。通过X射线衍射（XRD），显微硬度测试，光学显微镜和扫描电子显微镜（SEM）研究了扩散区和化合物层的结构和相组成。观察到，在CPN和ASPN方法中，处理后的样品表面均由γ'相和ε相组成，并且随着氮化时间和/或温度的增加，对于ASPN，化合物层中ε相的强度将增加，而对于CPN方法，复合层中的ε相强度会降低。 。结果表明，通过镀层的硬度和厚度，可以影响通过溅射和再冷凝机制从筛孔向样品表面转移的氮量。

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