Mo＋C双注入纯铁纳米相结构的形成和改性机理研究

Mo C双注入H13钢可明显地改善钢表面的抗腐蚀特性，然而改性机理却很少报道，我们对Mo C双注入纯铁微观结构变化进行了分析，用透射电子显微镜首次发现三元FeMo2C相，这种相在较低的束流密度和注入量下首先形成，随着束流密度和注入量的增加，碳化钼和碳化铁相形成。这些FeMo2C和MoC相均匀地弥散在注入层中，其尺寸在10－30nm，当束流密度增加到0.5A.m^-2，这些纳米相的密度和尺寸增加，形成了均匀的弥散强化结构，并且发现MoC相均匀分布在晶界间，这种结构形成了抗磨损的优化表面层和抗腐蚀的印化层，明显改善了材料表面抗磨损，抗疲劳和抗腐蚀特性。

Analysis of Formation and Modification Mechanism of Ferroferrite Nanometer Phase Structure by Mo + C Dual Implantation

The Corrosion and wear resistances of H13 steel were improved obviously by Mo C dual implantation.However,few papers for its modification mechanism were reported.The microstructure of Mo C dual implanted ferroferrite is observed by transmission electron microscope (TEM).The ternary FeMo2C nanometer phase is found first time.The FeMo2C nanometer phase is formed first in ferroferrite with low dose and low ion flux.When ion dose increases,the both of FeMo2C and MoC nanometer phases are formed and dispersed uniformly in the implanted layer.The size of the nanometer phases is about 10 to 30nm. When the ion flux increases to 0.5A/m2 the density and size of nanometer phases increase and the uniform dispersed strengthening structure is formed.It is also found that the MoC phases distribute uniformly in grain boundary.This structure forms the passivation layer against corrosion and wear.The optimum layer against wear improves the resistance of material surface in corrosion,wear and fatigue extremely.