Effect of La2O3 additive and salt bath temperature on oxygen-boronized microstructure and properties of TC4 titanium alloy

doi:10.13251/j.issn.0254-6051.2020.10.035

Abstract

Abstract: Effect of lanthanum oxide (La₂O₃) additive and salt bath temperature on microstructure and properties of oxygen-boronized specimens were studied by means of OM, SEM, XRD, EDS, Vickers hardness tester and friction tester. The results show that the thickness of the oxygen-boronized layer increases first and then decreases with the increase of the amount of La₂O₃. When the content of La₂O₃ is 3%, the thickness of the layer reaches the maximum value (32.74 μm). Compared with that obtained at the low temperature (950 ℃), at high temperature (1000 ℃) the layer has a better surface, with higher thickness (34.19 μm), higher surface hardness (1211 HV0.2), larger interfacial bonding force (87.36 N), and lower friction coefficient (0.28). By analyzing the influence of temperature on the process of boronizing and the test results, it is concluded that the salt bath boronizing test with lanthanum oxide additive at 1000 ℃ is more valuable.

Key words: lanthanum oxide, salt bath boronizing, TC4 titanium alloy, interface bonding force, friction and wear resistance

CLC Number:

TG178

Liu Yangguang, Xu Xiaojing, Song Zhenhua, Wang Yang, Zhu Liangliang, Zhu Jinsong. Effect of La₂O₃ additive and salt bath temperature on oxygen-boronized microstructure and properties of TC4 titanium alloy[J]. Heat Treatment of Metals, 2020, 45(10): 180-186.

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Effect of La₂O₃ additive and salt bath temperature on oxygen-boronized microstructure and properties of TC4 titanium alloy

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