35钢稀土快速盐浴渗氮技术及动力学分析

发布时间：2018-06-05 21:14

本文选题：稀土La + 盐浴渗氮　；参考：《材料热处理学报》2015年09期

【摘要】：以35钢为材料,通过在盐浴中添加一定量稀土La进行快速稀土盐浴渗氮。利用光学显微镜、扫描电镜和显微硬度计对渗层的显微组织、渗层厚度和硬度进行了测试和分析。研究结果表明:稀土La对盐浴渗氮具有显著的催渗效果,并且当稀土La添加量为5%时化合物层达到最厚。同时稀土盐浴渗氮可大幅度提高35钢表面硬度,经过848 K×2 h、5%稀土La盐浴渗氮处理后35钢次表面硬度最高达到835 HV0.01。稀土La盐浴渗氮中氮的扩散激活能可以从常规盐浴渗氮的270 k J·mol-1降低到134 k J·mol-1,表明稀土La对盐浴渗氮具有明显的催渗作用。同时对稀土La快速盐浴渗氮的机理进行了分析。
[Abstract]:The rapid nitriding of 35 steel in salt bath was carried out by adding a certain amount of rare earth La in salt bath. The microstructure, thickness and hardness of the layer were measured and analyzed by optical microscope, scanning electron microscope and microhardness tester. The results show that rare earth La has a remarkable catalytic effect on nitriding in salt bath, and the compound layer is the thickest when the amount of rare earth La is 5. At the same time, the surface hardness of 35 steel can be greatly increased by rare earth nitriding in salt bath. The surface hardness of 35 steel reached 835 HV0.01 after nitriding with 5% rare earth La in 848 K 脳 2 h. The diffusion activation energy of nitrogen in rare earth La salt bath nitriding can be reduced from 270kJ mol-1 to 134kJ mol-1, which indicates that rare earth La has obvious catalytic effect on salt bath nitriding. At the same time, the mechanism of lanthanide La nitriding in salt bath was analyzed.
【作者单位】：常州大学材料科学与工程学院江苏省表面工程技术重点实验室;常州轻工技术职业学院机械工程系;
【基金】：江苏高校优势学科建设工程项目江苏省研究生创新基金项目(SCZ100431322)
【分类号】：TG156.82

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