Laser surface zirconium infiltration method for improving surface hardness and wear resistance of titanium alloy

A surface hardness, titanium alloy technology, applied in metal material coating process, coating and other directions, can solve problems such as lack of effective means, and achieve the effect of improving surface hardness and wear resistance

Active Publication Date: 2020-04-24
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The reason is mainly that metallurgical defects and solidification structures need to be strictly controlled during the

Method used

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  • Laser surface zirconium infiltration method for improving surface hardness and wear resistance of titanium alloy
  • Laser surface zirconium infiltration method for improving surface hardness and wear resistance of titanium alloy

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Embodiment 1

[0019] A laser surface zirconium infiltration method for improving the surface hardness and wear resistance of titanium alloys comprises the following steps:

[0020] Step 1: Set the laser to the continuous laser output mode, and preliminarily optimize the laser zirconium infiltration process window to obtain a preliminary optimized process window: the laser spot diameter is 1.5~3.5mm, the defocus amount is -2.0mm, and the laser peak power is 600~ 900W, scanning speed is 6-15mm / s, powder feeding volume is 3-7g / min;

[0021] Step 2: Randomly select a set of preliminary optimized process parameters, use the finite element heat transfer model to calculate the three-dimensional temperature field of the molten pool under this parameter, and extract the temperature change curve experienced by the point in the middle of the sediment layer, that is, the temperature change at the fixed point of the molten pool curve; respectively extract the peak temperature Tmax of the fixed-point tem...

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Abstract

The invention discloses a laser surface zirconium infiltration method for improving the surface hardness and wear resistance of a titanium alloy. The method comprises the following steps of firstly, preliminarily optimizing a laser 3D printing process window; calculating a molten pool three-dimensional temperature field under preliminary optimization parameters by using a finite element heat transfer model to obtain a molten pool fixed-point temperature change curve; separately extracting the peak temperature Tmax of the molten pool temperature curve and the average value t of the sum of intercepts of the temperature curve, a liquidus and a solidus, and calculating an average cooling rate xi of the molten pool in the cooling stage; optimizing the process parameters according to the principles that Tmax is greater than or equal to 1.45 Tm and less than or equal to 1.7 Tm, t is greater than or equal to 250ms and less than or equal to 450ms, and xi is greater than or equal to 3.5 * 103 DEG C/s and less than or equal to 2.8 * 104 DEG C/s so as to obtain an optimized process window; and according to the optimized process parameters, carrying out the laser surface zirconium infiltrationtreatment to obtain a dense and high-metallurgical-quality surface zirconium infiltration modified layer. According to the method, the surface hardness and wear resistance of the titanium alloy can beeffectively improved.

Description

technical field [0001] The invention relates to the field of laser metal material processing, in particular to a laser surface zirconium infiltration method for improving the surface hardness and wear resistance of titanium alloys. Background technique [0002] Titanium alloys are widely used in aerospace, machinery and chemical industries due to their high specific strength and good corrosion resistance. However, the further widespread application of titanium alloys is limited due to the low surface hardness and poor wear resistance of titanium alloys. [0003] Zirconium infiltration on the surface of titanium alloy can effectively improve the surface wear resistance. For example, Jiang Ailong and others used double-layer glow plasma metal infiltration technology to treat the surface of titanium alloy with zirconium infiltration to improve the surface hardness and wear resistance of TC11 titanium alloy. The results show that the thickness of the infiltrated layer is about...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 李聪陈汪林谢盼陈荐朱磊
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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