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| Effects of Rare Earth Elements on Ionic Nitriding Process for 38CrMoAl Steel |
| Received:March 21, 2019 Revised:April 01, 2019 |
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| DOI：10.7643/issn.1672-9242.2019.09.013 |
| KeyWord:38CrMoAl steel chemical heat treatment rare earth carburizing ion nitriding |
| Author | Institution |
| SONG Na |
AECC Xi¢an Engine Control Technology Co., Ltd, Xi¢an , China |
| QIANG Wei |
AECC Xi¢an Engine Control Technology Co., Ltd, Xi¢an , China |
| YANG Xiao-ning |
AECC Xi¢an Engine Control Technology Co., Ltd, Xi¢an , China |
| GUO Xiu-qiao |
AECC Xi¢an Engine Control Technology Co., Ltd, Xi¢an , China |
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| Abstract: |
| Objective To shorten the ionic nitriding process cycle of 38CrMoAl steel. Methods In the process of ion nitriding, the rare-earth metal Lanthanum and the rare-earth La-Ce alloy was added to ion nitriding furnace. Then the surface hardness, brittleness, microstructure, of the rare earth elements of the ion nitriding layer was detected and analyzed by microhardness instrument, optical metallographic microscope, scanning electron microscope and energy spectrum analyzer, and it wasthen compared with the conventional ion nitriding process. Results The ion nitriding process catalyzed by rare earth (La and La-Ce) can could not only increase the surface hardness of the ion nitriding layer by 130~-200 HV, but also increase the nitriding speed by 15%~%-30%, and shorten the ionic nitriding process cycle was shortened significantly. The brittleness of the rare earth nitriding layer is was grade I grade, which is was better than that of the conventional nitriding layer. In addition, the infiltration of rare earth element can refine the grain structure , making make the nitride structure dense and distributed in a state of dispersion, andalso, optimize optimize the phase structure of the ion nitriding layer. Conclusion The addition of rare earth elements can effectively improve the surface hardness and brittleness of the ion nitriding layer, improve the performance of the ion nitriding layer, and shorten the ionic nitriding process cycle of 38CrMoAl steel. |
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