Method for achieving adjusting and controlling of titanium alloy beta crystal grains obtained through laser additional material manufacturing

A laser additive and titanium alloy technology, which is applied in the direction of additive manufacturing, additive processing, process efficiency improvement, etc., can solve the problems of complex physical process, numerous influencing parameters, and controlled grain morphology, so as to improve the mechanical properties Effect

Inactive Publication Date: 2018-09-04
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The above research provides a good idea for the regulation of the β-crystal morphology of titanium alloys manufactured by laser additive manufacturing. However, due to the extremely complex physical process and numerous influencing parameters in the laser metal 3D printing process, it is still difficult to completely control the grain morphology. there are great challenges
At present, there is still no effective method to effectively control the morphology of β crystals.

Method used

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  • Method for achieving adjusting and controlling of titanium alloy beta crystal grains obtained through laser additional material manufacturing
  • Method for achieving adjusting and controlling of titanium alloy beta crystal grains obtained through laser additional material manufacturing

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Embodiment 1

[0019] A method for realizing laser additive manufacturing of titanium alloy β grain regulation, comprising the following steps:

[0020] Step 1: Preliminary optimization of the laser additive manufacturing process window to obtain a preliminary optimized process window, including laser power, spot diameter, scanning speed and powder feeding volume. The optimized parameters are: laser power 300-900W, scanning speed 4 ~12mm / s, powder feeding rate is 6-18g / min, spot diameter is 0.5~2mm;

[0021] Step 2: Randomly select a set of process parameters under the optimization window, use the three-dimensional finite element heat transfer model to calculate the temperature field of the molten pool during the titanium alloy laser additive manufacturing process, and extract the longitudinal temperature of the middle of the molten pool at any moment after the laser is turned on for 1 second. The temperature gradient G1 and cooling rate ξ1 at the 1 / 3 height of the cross-section moving bound...

Embodiment 2

[0027] A method for realizing laser additive manufacturing of titanium alloy β grain regulation, comprising the following steps:

[0028]Step 1: Preliminary optimization of the laser additive manufacturing process window to obtain a preliminary optimized process window, including laser power, spot diameter, scanning speed and powder feeding volume. The optimized parameters are: laser power 300-900W, scanning speed 4 ~12mm / s, powder feeding rate is 6-18g / min, spot diameter is 0.5~2mm;

[0029] Step 2: Randomly select a set of process parameters under the optimization window, use the three-dimensional finite element heat transfer model to calculate the temperature field of the molten pool during the titanium alloy laser additive manufacturing process, and extract the longitudinal temperature of the middle of the molten pool at any moment after the laser is turned on for 1 second. The temperature gradient G1 and cooling rate ξ1 at the 1 / 3 height of the cross-section moving bounda...

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Abstract

The invention discloses a method for achieving adjusting and controlling of titanium alloy beta crystal grains obtained through laser additional material manufacturing. The method comprises the stepsthat a laser additional material manufacturing process window is preliminarily optimized, optimized process parameters are obtained, and under the optimized process window, the temperature field of amolten pool is calculated; the temperature gradient G and the cooling rate xi of the molten pool are extracted, and the G2/xi value is worked out; the beta grain histomorphology is judged according tothe following rules, specifically, when xi is larger than or equal to 3*10<3> and smaller than or equal to 10<5> DEG C and G2/xi is smaller than or equal to 1.2*10<6> DEG C s/m<2>, the beta grains are equiaxial grains, and when xi is smaller than or equal to 3*10<3> DEG C/s and G2/xi is larger than or equal to 3*10<9> DEG C s/m<2>, the beta grains are columnar grains; the main process parameter sections of the equiaxial beta grains and the columnar beta grains are obtained; and finally, laser additional material manufacturing is conducted by adopting the corresponding process parameters, andparts controllable in beta grain histomorphology are obtained. According to the method, through molten pool temperature field simulation and solidification theory combination, achieving adjusting andcontrolling of the beta crystal grains are achieved, and the mechanical property of the formed parts can be effectively improved.

Description

technical field [0001] The invention relates to the field of laser metal material processing, in particular to a method for realizing regulation of β grains of titanium alloy manufactured by laser additive manufacturing. Background technique [0002] Laser additive manufacturing technology, also known as "laser metal 3D printing", is an advanced manufacturing technology that combines laser cladding with rapid prototyping technology. This technology is based on the principle of "layer-by-layer manufacturing and layer-by-layer accumulation". It can quickly form solid parts directly according to the 3D CAD model of the part. It has the characteristics of high material utilization rate, short production cycle, small forming restriction, and no mold required. In the direct forming of complex large-scale integral parts, the surface modification of parts and the direct customization of personalized products, it can also realize the rapid repair of damaged parts. It has broad applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105C22C1/04C22C14/00B33Y10/00B33Y50/02
CPCC22C1/0458C22C14/00B33Y10/00B33Y50/02B22F10/00B22F10/38B22F10/366B22F10/25B22F10/36B22F10/80Y02P10/25
Inventor 李聪陈荐邱玮李微何建军
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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