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A composite treatment process of laser additive repair and surface nitriding of titanium alloy

A laser additive and composite processing technology, used in metal material coating technology, additive processing, metal processing equipment, etc., can solve problems such as high cost, pores and cracks, and processing

Active Publication Date: 2021-10-12
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ion nitriding is difficult to process parts with complex shapes, and the cost is high; laser nitriding is prone to defects, such as pores and cracks, etc.

Method used

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  • A composite treatment process of laser additive repair and surface nitriding of titanium alloy
  • A composite treatment process of laser additive repair and surface nitriding of titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take TC4 (α+β duplex) alloy as an example.

[0021] Step 1: Perform pretreatment on the surface of TC4 alloy parts, including machining, cleaning, sandblasting and drying of the area to be repaired; Step 2: Use a thermal imager to monitor the molten pool during the laser additive manufacturing process to obtain the shape of the molten pool appearance and temperature change information, calculate the average value a of the long axis of the molten pool and the average value b of the short axis, and calculate the average cooling rate ξ of the boundary of the molten pool; Step 3: According to 1.5≤a / b≤2.2, and 7.0×10 3 ℃ / s≤ξ≤8.3×10 4 The process parameters are optimized based on the ℃ / s principle to obtain the optimized additive repair process window: the laser power is 1350W, the scanning speed is 13mm / s, the spot diameter is 3.8mm, the powder feeding amount is 26g / min, and the overlapping amount is 50% , the height direction increment Z is 0.3 mm / layer, the repair materia...

Embodiment 2

[0025] Take TB1 (β type) alloy as an example.

[0026] Step 1: Perform pretreatment on the surface of TB1 titanium alloy parts, including machining, cleaning, sandblasting and drying of the area to be repaired; Step 2: Use a thermal imager to monitor the molten pool during the laser additive manufacturing process to obtain the molten pool Shape and temperature change information, calculate the average value a of the long axis of the molten pool and the average value b of the short axis, and calculate the average cooling rate ξ of the molten pool boundary; Step 3: According to 1.5≤a / b≤2.2, and 7.0× 10 3 ℃ / s≤ξ≤8.3×10 4 The ℃ / s principle optimizes the process parameters to obtain the optimized additive repair process window: the laser power is 1450W, the scanning speed is 13mm / s, the spot diameter is 3.5mm, the powder feeding amount is 27g / min, and the overlapping amount is 50% , the height direction increment Z is 0.3 mm / layer, and the repair material is a mixed powder of TB1 ...

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Abstract

The invention discloses a titanium alloy laser additive repair and surface nitriding compound treatment process. Firstly, the surface of the titanium alloy part is pre-treated, and the repair process parameters are as follows: the laser power is 1300-1500W, the scanning speed is 13mm / s, the spot diameter is 3.5-4mm, and the powder feeding amount is 25-30g / min , the overlapping amount is 50%, and the increment Z in the height direction is 0.3 mm / layer; post-treatment is performed on the surface of the repaired titanium alloy to restore the size and precision of the titanium alloy, and then the titanium alloy is nitrided: nitrogen pressure 200‑500Pa, temperature 540‑650°C, time 3‑8 hours, duty cycle 80; voltage ‑500V. Finally, anneal at 450°C for 1h. Obtain high-quality titanium alloy repair and surface modification samples. The hardness of the surface modification layer of the repair sample is as high as 1100HV-1200HV, and the wear resistance is 3-5 times higher than that of the base material.

Description

technical field [0001] The invention relates to the field of laser metal material processing, in particular to a titanium alloy laser additive repair and surface nitriding composite treatment process. Background technique [0002] Titanium and titanium alloys have the characteristics of low density, high specific strength, excellent corrosion resistance and high temperature resistance, and are widely used in the manufacture of key components in aerospace, nuclear industry and biomedical fields. However, titanium alloy parts have low surface hardness and poor wear resistance, and are very sensitive to adhesive wear and fretting wear. Titanium alloy parts are prone to wear, cracks, fatigue, etc. during service, resulting in failure of parts and economic losses. Laser additive repair technology uses high-energy beam laser as the heat source, which has the characteristics of low heat input, small dilution, small heat-affected zone and small deformation, and can realize rapid re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/06B22F10/28B22F10/62B22F10/64C23C8/24C23C8/80B33Y10/00B33Y40/20B33Y70/00
CPCB22F7/062B22F3/24C23C8/24C23C8/80B33Y10/00B33Y40/20B33Y70/00B22F2007/068B22F2003/242B22F2003/248C23C24/085C23C24/087B22F10/25C22C1/0458B22F10/80B22F12/90B22F10/62B22F10/66B23K2103/14B23P6/00B23P6/007B22F2003/244B22F2003/247B22F2998/10B22F2999/00B22F10/366B22F10/368B33Y50/02B33Y80/00Y02P10/25B22F10/64B22F2201/02
Inventor 李聪肖斌谢盼陈荐邱玮李微何建军
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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