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Method for preparing TiAl/TC4 micro-laminate composite material by selective laser melting

A technology of laser selective melting and composite materials, which is applied in the direction of additive manufacturing, additive processing, and improvement of process efficiency. Temperature gradient, good overall performance

Inactive Publication Date: 2019-01-15
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of TiAl-based micro-laminated composite materials is more difficult, and the traditional method is difficult to prepare. At present, it is only stagnant in the research of material preparation, and it is not yet possible to realize the manufacture of parts.

Method used

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  • Method for preparing TiAl/TC4 micro-laminate composite material by selective laser melting
  • Method for preparing TiAl/TC4 micro-laminate composite material by selective laser melting
  • Method for preparing TiAl/TC4 micro-laminate composite material by selective laser melting

Examples

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Effect test

Embodiment 1

[0070] like figure 1 As shown, a method for preparing TiAl / TC4 micro-laminated composites by laser selective melting. The laser selective melting equipment is equipped with an IPG 400W fiber laser, and the spot diameter is 100 μm; the forming room is equipped with a preheating platform, and the maximum preheating temperature is 200 ℃; Equipped with two powder storage boxes, respectively storing TiAl powder and TC4 powder, the preheating device of the powder storage box is a heating platform customized by Shanghai Optical Instrument Factory, with a maximum temperature of 400 degrees. The powder adopts gas-atomized Ti-48Al-2Cr-2Nb (powder particle size is 15-48 μm), TC4 powder (powder particle size is 63-97 μm). The experimental substrate is a cold-rolled Ti plate, and the size of the substrate is 250*250*15mm. The gas drying filter is Baihui AC4010-04; the gas heater is Jingcheng Machinery QW-500, and the maximum heating temperature is 100°C. The day before the experiment, th...

Embodiment 2

[0079] like figure 1 As shown, a method for preparing TiAl / TC4 micro-laminated composites by laser selective melting, embodiment 2 is basically the same as embodiment 1, the difference is the layer ratio of TC4 and TiAl in step 4, every 4 layers of TC4 Then lay 2 layers of TiAl alternately.

[0080] like image 3As shown, the TiAl / TC4 micro-laminate block formed part obtained in Example 2 has regular shape, compactness and no cracks. Observation of the metallographic structure of the cross-section shows that there are no pores and cracks in the formed part structure. Due to the increased content of TC4, the mechanical properties are better than those of the formed part in Example 1. The measured tensile strength and elongation in the parallel forming direction are 530 MPa and 2.32%, respectively. The tensile strength and elongation measured at 700°C were 460MPa and 15.45%, respectively.

[0081] The conventional technologies in the above embodiments are known to those skil...

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Abstract

The invention provides a method for preparing a TiAl / TC4 micro-laminate composite material by selective laser melting (SLM), belonging to the technical field of advanced manufacturing. The method comprises a step of preprocessing formed powder, a step of slicing a structural part model and planning a scanning path and parameters, a step of preheating a substrate, and a step of allowing selective laser melting equipment to alternately lay the formed powder and allowing laser to scans layer by layer to form a formed piece. The method has the advantage that the layer-by-layer alternate stacking is carried out through the selective laser melting equipment. At the same time, the substrate preheating is used, the temperature gradient is reduced by laser in-situ pre-sintering, the residual internal stress is improved, the crack generation is effectively suppressed, and a TiAl / TC4 micro-laminated sample with full density and good comprehensive performance is obtained. Different layer ratios can be set according to performance requirements so as to achieve the preparation of formed pieces with different performance requirements, the limitation of the preparation method by the strength, plasticity and density of the formed pieces is reduced, and the application field of the SLM is expanded at the same time.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology, and in particular relates to a method for preparing TiAl / TC4 micro-laminated composite material by laser selective melting. Background technique [0002] TiAl-based alloys have the advantages of low density, high specific strength, good oxidation resistance and high-temperature creep resistance, and can reduce the weight of high-temperature structural parts by 30-40%. They have broad application prospects in aerospace, automotive and other fields. However, due to the low room temperature ductility of TiAl-based alloys (about 0.3%) and the difficulty of hot working, its development and application are seriously restricted. Selective Laser Melting (SLM) is a rapid manufacturing technology that can directly form high-density, high-precision and complex structural metal parts. Compared with traditional manufacturing methods, it greatly improves the utilization rate of materials and sh...

Claims

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Application Information

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IPC IPC(8): B22F3/105C22C14/00B33Y10/00B33Y30/00
CPCC22C14/00B33Y10/00B33Y30/00B22F10/00B22F10/36B22F12/13B22F10/366B22F10/28B22F10/322B22F10/73Y02P10/25
Inventor 石学智杨淑洁马树元
Owner ZHEJIANG OCEAN UNIV
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