Abstract: Titanium and titanium alloy are widely used in aerospace, automobile and ship, national defense industry, medical treatment and other fields. However, the low hardness, poor friction and wear properties of titanium and its alloy restrict their application in tribology. The carburized layer on the surface of titanium alloy can obviously improve the surface hardness and friction and wear performance of titanium alloy. In this paper, three carburizing processes, gas carburizing, laser carburizing and plasma carburizing, as well as corresponding carburizing mechanism and microstructure characteristics of carburizing layer, are summarized. The gas carburizing of titanium alloy mainly uses CO and methane as carbon sources. Through gas-solid interface transmission, activated carbon atoms diffuse to the surface and subsurface layer and form TiC layer, which is a relatively economic carburizing method. During gas carburizing, titanium alloy is completely exposed to the atmosphere, and dense oxide layer is easily formed due to the high affinity between oxygen and titanium, which hinders the further diffusion of carbon atoms. TiC was generated in situ on the surface of titanium alloy by laser carburizing. During laser carburizing, only part of the material is melted, therefore the energy consumption is small. The carburizing layer can show uniform microstructure, high toughness, and high adhesion strength with the matrix. Plasma carburizing causes carbon ions to collide with titanium alloy surface to form carburizing layer under cathode and anode ionization. The formation of oxide film and hydrogen embrittlement can be avoided under the vacuum treatment conditions. The plasma carburizing layer is deep, TiC concentration is higher, and the carburizing period is short. In this paper, the similarities and differences of three different carburizing processes of titanium alloys are compared, and the research prospects of carburizing treatment of titanium alloys are proposed.
庄唯, 王耀勉, 杨换平, 剡文斌. 钛合金渗碳处理研究进展[J]. 材料导报, 2020, 34(Z2): 344-347.
ZHUANG Wei, WANG Yaomian, YANG Huanping, YAN Wenbin. Research Progress in Carburizing Treatment of Titanium Alloys. Materials Reports, 2020, 34(Z2): 344-347.
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