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本文研究了低碳易切钢的奥氏体氮碳共渗,再经180～340℃温度范围,进行不同温度和不同保温时间的人工时效。观察了其显微组织的变化,测试了其ε相化合物层、奥氏体淬火层的显微硬度及其机械性能。结果表明:低碳易切钢经奥氏体氮碳共渗比常规铁素体氮碳共渗得到更厚的ε相化合物层,且可获得常规铁素体氮碳共渗所没有的奥氏体淬火层;经恰当的人工时效可显著提高其内侧ε相化合物层及淬火层的硬度。分析了该新工艺在现代工业中的适用范围及应用前景。
In this paper, the austenitizing nitrocarburizing of low-carbon free-cutting steel was studied, and the artificial aging at different temperatures and different holding time was carried out through the temperature range of 180 ~ 340 ℃. The changes of microstructure were observed. The microhardness and mechanical properties of ε phase compound layer and austenite quenched layer were tested. The results show that the austenitic nitrocarburizing of low-carbon free-cutting steels leads to a thicker ε-phase compound layer than the conventional ferritic nitrocarburizing, and the austenite can not be obtained by conventional ferritic nitrocarburizing Body quenched layer; the proper artificial aging can significantly increase the hardness of the ε phase compound layer and hardened layer inside. The application of the new process in modern industry and its application prospect are analyzed.