Plasma Nitriding of 722M24 Steel with Pure Lanthanum, Cerium and Neodymium as Sputter Sources
来源期刊：JOURNAL OF RARE EARTHS2001年第2期
论文作者：孙勇 张津
Abstract: A series of experiments were carried out to investigate the influence of pure rare earth addition on the plasma nitriding response of low alloy steel. For this purpose, pure rare earth metals (La, Ce and Nd) were put into the plasma nitriding furnace as sputter sources during nitriding of 722M24 steel. A variety of experimental and analytical techniques were employed to evaluate the structures and hardening response of the nitrided layers which included metallography for structural examination, glow discharge spectrometry and secondary ion mass spectrometry for chemical composition profile analysis, X-ray diffraction for phase identification and microhardness testing for hardness profile measurements. The results show that the incorporation of rare earth metals in the glow discharge during plasma nitriding not only influences the discharge characteristics but also results in the deposition of rare earth atoms and their compounds onto the specimen surface. These significantly affect the response of the investigated steel to plasma nitriding. The extent of the influence on plasma nitriding varies with different rare earth metals.
孙勇1，张津2
(1.School of Materials Engineering, Nanyang Technological University, Singpore 639798;
2.State Key Laboratory of Mechanical Transmission, Chongqing University,)
Abstract:A series of experiments were carried out to investigate the influence of pure rare earth addition on the plasma nitriding response of low alloy steel. For this purpose, pure rare earth metals (La, Ce and Nd) were put into the plasma nitriding furnace as sputter sources during nitriding of 722M24 steel. A variety of experimental and analytical techniques were employed to evaluate the structures and hardening response of the nitrided layers which included metallography for structural examination, glow discharge spectrometry and secondary ion mass spectrometry for chemical composition profile analysis, X-ray diffraction for phase identification and microhardness testing for hardness profile measurements. The results show that the incorporation of rare earth metals in the glow discharge during plasma nitriding not only influences the discharge characteristics but also results in the deposition of rare earth atoms and their compounds onto the specimen surface. These significantly affect the response of the investigated steel to plasma nitriding. The extent of the influence on plasma nitriding varies with different rare earth metals.
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