Rastkar A R, Kiani A, Alvand F, Shokri B, Amirzadeh M
Plasma Engineering Group, Laser & Plasma Research Institute, Shahid Beheshti University, G. C., Evin, Tehran 1983963113, Iran.
J Nanosci Nanotechnol. 2011 Jun;11(6):5365-73. doi: 10.1166/jnn.2011.3771.
We studied the mechanical properties and wear performance of AISI 1045 (Ck45) carbon steel under the influence of pulsed plasma nitriding. The treatments were performed at temperatures of 500 and 550 degrees C in N2:H2 gas ratios of 1:3 and 3:1 and the working pressure of 10 mbar for 1 to 4 hours. Samples were examined by X-ray diffraction, optical, electron and atomic force microscopy, microhardness tests, roughness measurements and wear tests. Nitride layers were mainly composed of epsilon-(Fe2-3N) or gamma'-(Fe4N) depending on the gas ratio and/or temperature and time. When the nitriding time is increased, the composition of the compound layer varies from monophase gamma'-(Fe4N) to the two phase of epsilon-(Fe2-3N) and gamma'-(Fe4N). The highest thickness and hardness of the layers were obtained at 550 degrees C in the N2:H2 gas ratios of 3:1 for 4 h. The topographical evolution and surface roughness of the samples showed that all the roughness parameters increase with increasing the temperature. The friction coefficient of all samples was higher than that of untreated material. Wear performance of all nitrided samples was significantly better than that of untreated material.
我们研究了脉冲等离子体渗氮影响下AISI 1045（Ck45）碳钢的力学性能和磨损性能。处理在500和550摄氏度的温度下进行，N2:H2气体比例为1:3和3:1，工作压力为10毫巴，持续1至4小时。通过X射线衍射、光学、电子和原子力显微镜、显微硬度测试、粗糙度测量和磨损测试对样品进行检测。根据气体比例和/或温度及时间，氮化物层主要由ε-(Fe2-3N)或γ'-(Fe4N)组成。当渗氮时间增加时，化合物层的成分从单相γ'-(Fe4N)变为ε-(Fe2-3N)和γ'-(Fe4N)的两相。在550摄氏度、N2:H2气体比例为3:1、处理4小时的条件下，获得了最高的层厚度和硬度。样品的形貌演变和表面粗糙度表明，所有粗糙度参数均随温度升高而增加。所有样品的摩擦系数均高于未处理材料。所有渗氮样品的磨损性能均明显优于未处理材料。
