稀土对模具钢QPQ渗层组织和性能的影响
Influence of RE on Microstructure and Properties of Die Steel by QPQ Salt-bath Treatment
熊光耀, 赵明娟, 赵龙志, 周泽杰
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作者单位：华东交通大学 载运工具与装备省部共建教育部重点实验室, 江西 南昌 330013
中文关键字：稀土化合物LaCO3； 5CrNiMo模具钢； QPQ盐浴处理； 显微硬度； 耐磨性
英文关键字：rare earth LaCO3; 5CrNiMo die steel; QPQ salt-bath treatment; micro hardness; wear resistance
中文摘要：研究了5CrNiMo模具钢经不同浓度稀土QPQ处理后的组织和性能，在QPQ处理过程中加入适量稀土化合物LaCO3对5CrNiMo钢进行表面改性处理。利用扫描电镜(SEM)分析了5CrNiMo处理后的表面金相显微组织和表面形貌、氮化层深度，采用401MVA型显微维氏硬度计测量试样显微硬度，在M-2000型磨损试验机上进行滑动磨损试验。结果表明，QPQ处理加入适量的稀土不仅有明显的催渗作用，而且能提高5CrNiMo钢的硬度及耐磨性。
英文摘要：The microstructure and properties of 5CrNiMo steel by QPQ salt-bath treatment with different concentration of rare earth(RE) were studied. The RE LaCO3 was used in QPQ process. The surface of 5CrNiMo steel was treated using this method. The microstructure and depth of the treated surface for the steel were analyzed using SEM. The sliding wear resistance was tested on M-2000 tester and the micro-hardness was tested using 401MVA microscopy hardness tester. The results show that the hardness, wear resistance and the speed of nitriding highly improve and the performance of nitriding layer and the nitriding structure improves.