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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure Characterization and Corrosion Properties of Nitrocarburized AISI 4140 Low Alloy Steel
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Microstructure Characterization and Corrosion Properties of Nitrocarburized AISI 4140 Low Alloy Steel

机译：氮碳共渗AISI 4140低合金钢的组织特征和腐蚀性能

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摘要

Plasma nitrocarburizing treatments of AISI 4140 low alloy steel have been carried out in a gas mixture of 85% N_2-12% H_2-3% CO_2. All treatments were performed for 5 h at a chamber pressure of 4 mbar. Different treatment temperatures varying from 520 to 620℃ have been used to investigate the effect of treatment temperature on the corrosion and hardness properties and also microstructure of the plasma nitrocarburized steel. Scanning electron and optical microscopy, x-ray diffraction, microhardness measurement, and potentiodynamic polarization technique in 3.5% NaCl solution were used to study the treated surfaces. The results revealed that plasma nitrocarburizing at temperatures below 570℃ can readily produce a monophase ε compound layer. The compound layer formed at 620℃ is composed of two sub-layers and is supported by an austenite zone followed by the diffusion layer. The thickest diffusion layer was related to the sample treated at 620℃. Microhardness results showed a reduction of surface hardness with increasing the treatment temperature from 520 to 620℃. It has also been found that with increasing treatment temperature from 520 to 545℃ the corrosion resistance increases up to a maximum and then decreases with further increasing treatment temperature from 545 to 620℃.
机译：已在85％N_2-12％H_2-3％CO_2的混合气体中对AISI 4140低合金钢进行了等离子体氮碳共渗处理。所有处理均在4毫巴的室内压力下进行5小时。研究了不同的处理温度（520至620℃），以研究处理温度对等离子氮碳共渗钢的腐蚀和硬度以及显微组织的影响。使用扫描电子显微镜和光学显微镜，X射线衍射，显微硬度测量以及在3.5％NaCl溶液中的电位动力学极化技术来研究处理过的表面。结果表明，在570℃以下进行等离子体氮碳共渗可以容易地产生单相ε化合物层。在620℃形成的化合物层由两个子层组成，并由奥氏体区和扩散层支撑。最厚的扩散层与在620℃下处理的样品有关。显微硬度结果表明，随着处理温度从520℃升高，表面硬度降低。还发现，随着处理温度从520升高到545℃，耐腐蚀性达到最大，然后随着处理温度从545升高到620℃而降低。

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