Pulse laser surface melting method for achieving grain shape regulation of titanium alloy surface

A pulsed laser and titanium alloy technology, which is applied in the direction of process efficiency improvement, additive manufacturing, and energy efficiency improvement, can solve the problem of lack of effective control of laser surface modification of titanium alloy β crystal morphology

Active Publication Date: 2018-11-06
HUNAN UNIV
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Problems solved by technology

The above research provides a good insight and theoretical basis for the regulation of the β-crystal morphology of laser surface fused titanium all

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  • Pulse laser surface melting method for achieving grain shape regulation of titanium alloy surface
  • Pulse laser surface melting method for achieving grain shape regulation of titanium alloy surface

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] A pulsed laser surface melting method for realizing regulation and control of titanium alloy surface crystal grains, comprising the following steps:

[0019] Step 1: Preliminary optimization of the laser surface fusion process window to obtain a preliminary optimized process window, including laser power, scanning speed, and spot diameter. The parameters are: laser power P is 400-100W, and scanning speed V is 4-14mm / s, spot diameter D is 0.8~2.5mm;

[0020] Step 2: Under the optimized process window, use a colorimetric pyrometer to record the temperature change at a fixed point on the surface of the molten pool during the laser melting process, obtain a fixed-point thermal cycle curve at the center of the molten pool, and compare the solidus and liquidus of the thermal cycle curve. Deriving from the temperature range of the phase line ...

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Abstract

The invention discloses a pulse laser surface melting method for achieving grain shape regulation of a titanium alloy surface. The method includes first preliminarily optimizing a laser surface melting process window and recording the fixed-point temperature change of the molten pool surface during the laser melting process under the optimized process window to obtain a fixed-point thermal cycle curve and the average cooling rate Xi at the molten pool center; When Xi<=2*10<3>DEG C/s and Xi/V2>=5*10<8>DEG Cs/m<2>, providing continuous laser for columnar crystal with the laser power of 400-900Wand the scanning speed of 6-10mm/s; when 2*10<3><= Xi <=10<5>DEG C/s and Xi/V2<=10<6>DEG Cs/m<2>, providing pulse laser with square waveform for isometric crystal with the laser power of 600-1000W andthe scanning speed of 4-8mm/s; finally obtaining the titanium alloy surface with the beta crystal form regulated. By means of the method, regulation of the beta crystal shape on the titanium alloy surface is achieved, and the mechanical property of a formed part can be effectively improved.

Description

technical field [0001] The invention relates to the field of laser metal material processing, in particular to a pulsed laser surface melting method for realizing regulation and control of titanium alloy surface crystal grains. Background technique [0002] Titanium alloys are widely used in aerospace, chemical industry, energy and biomedical fields due to their high specific strength, good biocompatibility and corrosion resistance. However, titanium alloys have problems such as low surface hardness, poor wear resistance, easy adhesive wear with contact materials, and poor corrosion resistance in reducing acids. These problems limit the wider industrial application of titanium alloys. Surface treatment (such as nitriding, carbonitriding, physical vapor deposition, chemical vapor deposition, and laser surface treatment, etc.) can be used as an effective method to improve the surface properties of titanium alloys. Among them, the laser beam has strong convergence, high energy ...

Claims

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Application Information

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IPC IPC(8): C22F3/00B22F3/105B33Y10/00B33Y50/02
CPCC22F3/00B33Y10/00B33Y50/02B22F10/00B22F10/38B22F10/368B22F12/43B22F10/366B22F12/90B22F10/36Y02P10/25
Inventor 宋立军肖辉李言覃李思萌肖文甲罗国云成满平
Owner HUNAN UNIV
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