针对Ti6Al4V合金低温渗氮的问题，设计了一种渗氮工艺，研究了该工艺对Ti6Al4V合金组织和力学性能的影响。通过变形增强渗氮动力，使渗氮可以在较低温度(500°C)下实现，氮化与Ti6Al4V合金基体的弥散强化同时进行。实验过程为固溶强化→室温下冷轧变形→500°C低温渗氮。结果表明，在渗氮一段时间后，试样表面形成了白亮的氮化层并且趋于稳定，变形量和变形时间对氮化层的影响不明显。试样基体组织时效效果明显，表面硬度与基体组织硬度随变形量增加而增加。经XRD物相分析，试样表面生成的氮化物为TiN、Ti2N、Ti4N3?X和 Ti3N1.29，横截面氮化物为 Ti3N1.29和 TiN0.3。对经过变形、渗氮和时效等工艺的试样进行摩擦磨损实验，渗氮试样的耐磨性最好。
An integrated low-temperature nitriding process was carried out for Ti6Al4V to investigateitseffect on microstructure and properties.The process was designed to enhance the nitriding kinetics in low-temperature(500°C) nitriding by deformation, and to strengthen Ti6Al4V alloybydispersionat the same time. Specimens of Ti6Al4V alloyweretreated through the process of solid solutionstrengthening?cold deformation?nitriding at 500°C. The white nitriding layeris formed after some time and then kept stable, changing little withthedeformationdegreeand time. The effect of aging on substrate is significant. Surface hardness and substrate hardnessincrease with deformation increasing. The construction was investigated by XRD.The surface nitridesare TiN, Ti2N, Ti4N3?Xand Ti3N1.29,and thenitridesin cross-section are Ti3N1.29and TiN0.3. The wear tests of specimens after nitriding, aging and deformation were carried out,andthetest data show that the nitrided pieces have the best wear resistance.
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