Arc deposition of wear resistant layer TiN on Ti6Al4V using simultaneous feeding of nitrogen and wire

• Published in: Surface & coatings technology Vol. 381; p. 125141
• Main Authors: Huang, Jiankang, Liu, Shien, Yu, Shurong, Yu, Xiaoquan, Chen, Huizi, Fan, Ding
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.01.2020; Elsevier BV
• Subjects: Arc cladding; Arc deposition; Claddings; Coefficient of friction; Diamond pyramid hardness; Flow velocity; Friction and wear; Frictional wear; Mechanical properties; Microstructure; Nitrogen; Optical microscopes; Process parameters; Shielding; Surface properties; TIG; Titanium alloy; Titanium alloys; Titanium base alloys; Titanium nitride; Tungsten; Wear resistance; Titanium alloy; Titanium nitride; Arc cladding; TIG; Microstructure; Friction and wear
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2019.125141

As an admirable surface improvement method, arc surface cladding has been widely used in various fields. The surface properties of titanium alloy were improved by gas tungsten arc cladding. In the process of arc claddings, a certain amount of nitrogen was added in the shielding gas to form the hard phase of TiN in the cladding layer. Titanium alloy surface was cladded with the same process parameters and different nitrogen flow rate. The effects of nitrogen flow rate on the microstructure and mechanical performance of the cladding layer were studied through an optical microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), Vickers hardness and friction wear testing machine. The results show that the increase of the nitrogen flow rate not only changes the shape of the arc but also forms a large number of TiN hard phases in the cladding layer. With the increase of the nitrogen flow rate, the number of TiN hard phases in the cladding layer increases gradually, which improves the mechanical property of the cladding layer. The Vickers hardness of the cladding layer is much larger than 600 HV and the friction coefficient is 0.419 when the nitrogen rate is 2 L/min. •A wear resistance layer was fabricated by the arc deposition with simultaneous nitrogen and wire feeding.•With the increase of nitrogen flow rate, α-Ti in the cladding layer gradually transforms into TiN phase rate.•The friction and wear property of the cladding layer increased with the increase of nitrogen flow rate.