Vacuum Tribological Properties of Titanium Enhanced via Ultrasonic Surface Rolling Processing Pretreatment and Plasma Nitriding
Vacuum Tribological Properties of Titanium Enhanced via Ultrasonic Surface Rolling Processing Pretreatment and Plasma Nitriding
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DOI：
10.1080/10402004.2017.1380870
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发表时间：
2018-01
影响因子：
2.1
通讯作者：
Ding-shun She;W. Yue;Jia-jie Kang;Fei Huang;Chengbiao Wang;J. Shen
中科院分区：
文献类型：
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作者：
Ding-shun She;W. Yue;Jia-jie Kang;Fei Huang;Chengbiao Wang;J. Shen
摘要为了提高UNS R50400钛合金的真空减摩抗磨性能，采用超声表面滚压处理（USRP）作为离子渗氮（PN）的预处理。采用650~950 ° C的不同渗氮温度，研究了USRP预处理对钛离子渗氮的影响。试验结果表明，在PN温度低于750 ° C时，USRP预处理可使钢的减摩抗磨性能得到提高，其原因是形成了较厚、较硬的氮化层，并具有合理的梯度结构。然而，当PN温度高于750 ° C时，USRP预处理导致粗糙的表面和大尺寸的柱状晶梯度结构，导致真空摩擦学性能差。总的来说，USRP预处理是一种有效的预处理，可以将最佳等离子渗氮温度从850 ° C降低到750 ° C。
ABSTRACT For the purpose of enhancing the vacuum friction-reducing and antiwear performance of UNS R50400 Ti, ultrasonic surface rolling processing (USRP) has been introduced as pretreatment of plasma nitriding (PN). Various nitriding temperatures from 650 to 950°C have been adopted to investigate the effects of USRP pretreatment on plasma nitriding of Ti. The results of experiments show that the friction-reducing and antiwear performance are enhanced by USRP pretreatment when the PN temperature is below 750°C, resulting from the formation of thicker and harder nitriding layer with a reasonable gradient structure. Nevertheless, USRP pretreatment results in a rough surface and a large-sized columnar crystal gradient structure when the PN temperature is above 750°C, leading to poor vacuum tribological performance. In aggregate, USRP pretreatment is an effective pretreatment to decrease the optimized plasma-nitriding temperature from 850 to 750°C.