钛合金表面熔化渗氧氧元素传输机理及调控研究详细信息

钛合金表面熔化渗氧氧元素传输机理及调控研究
Study on mechanism and regulation of oxygen element transport in Titanium alloy surface melting oxidizing layer

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编制时间： Friday, October 15, 2021 报告类型：最终报告

报告作者：

[1]郭晋昌(陇东学院)
[2]杨娜娜(陇东学院)
[3]刘馨(陇东学院)
[4]胡天林(陇东学院)
[5]边建潇(陇东学院)
[6]寇元哲(陇东学院)

中文摘要：

本研究首次提出钛合金表面熔化渗氧的工艺方法，即采用氩气稀释氧气，在稀释氧环境中采用激光照射钛合金表面，钛合金表面熔化形成熔池，稀释氧气与熔池发生化学反应，氧元素进入熔池并随熔池一起冷却凝固形成渗氧层，提高钛合金表面硬度和耐磨性。为了证明工艺方法的可行性，本研究进行了大量工艺试验，优化了工艺参数，测试了渗氧层显微硬度和耐磨性。为了研究氧元素在熔池中的传输行为，采用高速摄像系统结合示踪粒子法拍摄了熔池表面流动行为，并对熔池表面照片进行了图像处理，计算了熔池表面流动速度。为了研究氧元素在渗氧层中的扩散行为，采用红外测温仪测量了渗氧层表面温度，并理论算了氧元素的扩散速度。为了调控氧元素传输行为，研究了氧气与氩气流量比对熔池和渗氧层的影响。试验表明：气体环境中氧气含量越低，则渗氧层成型越好，当氧气和氩气流量比小于16:4时，工艺过程可控性高，渗氧层成型良好。渗氧层的显微硬度和耐磨性比TC4基体大幅提高，并且气体环境中氧含量越高，渗氧层的显微硬度和耐磨性越好，新工艺方法是可行的。熔池流动行为与传统马兰戈尼对流模式一致，在熔池表面从中间往四周流动。熔池流动的速度大约960 mm/s，剧烈的对流主导了氧元素在渗氧层中的宏观分布。氧元素在已凝固的高温渗氧层中扩散速度较快，扩散系数为7.92*10-10 m2/s。扩散使氧元素在渗氧层中分布更均匀。渗氧层中氧含量在一定范围内波动。随渗氧层深度增加，氧元素的分布没有明显的梯度特征。气体环境中氧气和氩气流量比越大时，渗氧层越深，并且渗氧层中的氧含量更高。可以通过控制气体环境中氧气和氩气流量比调控渗氧层中氧元素的传输，得到理想的渗氧层氧元素分布。

英文摘要：

In this study, the technique method of titanium alloy surface melt oxidation was put out firstly, argon was used to dilute oxygen, laser was used to irradiate the surface of titanium alloy in dilute oxygen environment, titanium alloy surface melt and formed molten pool, dilute oxygen reacted with molten pool, oxygen got into the molten pool and solidified with molten pool to form oxidation layer, improved the surface hardness and wear resistance of titanium alloy. In order to prove the feasibility of the technique method, a lot of process tests were carried out in this study to optimize the process parameters and test the microhardness and wear resistance of the oxidation layer. In order to study the transfer behavior of oxygen in the molten pool, the flow behavior on the molten pool surface was photographed by a high-speed camera system combined with tracer particle method, and the flow velocity on the molten pool surface was calculated by image processing. In order to study the diffusion behavior of oxygen elements in the oxidation layer, the surface temperature of the oxidation layer was measured with an infrared thermometer, and the diffusion velocity of oxygen elements was calculated theoretically. In order to regulate the transport behavior of oxygen elements, the effect of oxygen and argon flow ratio on molten pool and oxidation layer was studied. The results showed that, The lower the oxygen content in the gas environment, the better the formation of the oxidation layer. When the oxygen and argon flow ratio is less than 16:4, the process was highly controllable and the oxidation layer was well formed. The microhardness and wear resistance of the oxidation layer were significantly higher than that of TC4 matrix, and the higher the oxygen content in gas environment, the better the microhardness and wear resistance of the oxidation layer, so the new process method is feasible. The flow behavior of the molten pool was consistent with that of the traditional Marangoni convection model, which flowed from the middle to the periphery on the molten pool surface. The velocity of molten pool flow was about 960 mm/s, and severe convection dominated the macroscopic distribution of oxygen elements in the oxidation layer. The diffusion rate of oxygen element in the solidified high-temperature oxidation layer was faster, and the diffusion coefficient is 7.92*10-10 m2/s. Diffusion resulted in a more uniform distribution of oxygen elements in the permeable layer. The oxygen content in the oxidation layer fluctuated within a range. The distribution of oxygen element had no obvious gradient with the increase of oxidation layer depth. The high the oxygen and argon flow ratio in the gas environment, the deeper the oxidation layer and the higher the oxygen content in the oxygen layer. The ideal distribution of oxygen elements could be obtained by controlling the flow ratio of oxygen and argon in the gas environment.

中文关键词：

钛合金; 渗氧层; 氧元素传输; 调控

英文关键词：

titanium alloy; oxidation layer; oxygen transport; regulate and control

全文页数：

27 ,图21,表3

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