Quantitative characterization method of elastoplasticity performance parameter of gradient modification layer on surface of titanium alloy

A surface gradient, quantitative characterization technology, applied in the direction of strength characteristics, measuring devices, testing material hardness, etc., can solve the problem of lack of quantitative characterization methods for mechanical properties parameters of titanium alloy surface gradient modified layer.

Inactive Publication Date: 2018-11-30
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, due to the lack of quantitative characterization methods for the mechanical property parameters of the titanium alloy surface gradient modification layer, it cannot be widely used in practice despite its good modification properties.
[0003] At present, the gradient modified layer on the surface of titanium alloy mainly uses the composite hardness to qualitatively characterize its mechanical properties. The stress and strain state inside the modified layer are established to establish the corresponding failure mechanism, and then provide theoretical reference for the design and engineering application of the modified layer on the titanium alloy surface

Method used

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  • Quantitative characterization method of elastoplasticity performance parameter of gradient modification layer on surface of titanium alloy
  • Quantitative characterization method of elastoplasticity performance parameter of gradient modification layer on surface of titanium alloy
  • Quantitative characterization method of elastoplasticity performance parameter of gradient modification layer on surface of titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0031] Taking molybdenum molybdenum Mo on the surface of pure titanium Ti as an example (process parameters are: source negative bias voltage -660~-900V, workpiece negative bias voltage -300~-650V, temperature 900°C, holding time 3h), through the method of the present invention to solve The elastoplastic performance parameter of Mo gradient modification layer specifically comprises the following steps:

[0032] Step 1: Determine the thickness of the deposition layer and the diffusion layer: Use GDOES-750 glow discharge spectrometer to detect the composition distribution of the gradient modified layer, and determine the thickness d of the deposition layer in combination with the cross-sectional scanning electron microscope photos 1 and the thickness of the diffusion layer d 2 ;

[0033] Step 2: Nanoindentation test: select 10 test points, adopt displacement loading mode, conduct nanoindentation test on the titanium alloy substrate and the surface of the deposited layer respect...

Embodiment 2

[0048]Taking nickel-impregnated Ni on the surface of titanium alloy Ti6Al4V as an example (process parameters are: source negative bias voltage -700~-900V, workpiece negative bias voltage -500~-700V, temperature 930°C, holding time 3h), using the same example 1, the elastic-plastic performance parameters of the Ni gradient modified layer are obtained in Table 2.

[0049] Table 2 Elastoplastic performance parameters of Ni gradient modified layer on Ti6Al4V surface

[0050]

Embodiment 3

[0052] Take zirconium-nitrogen (Zr-N) co-infiltration on the surface of titanium alloy Ti6Al4V as an example (process parameters are: source negative bias voltage -720~-820V, workpiece negative bias voltage -450~-500V, process temperature 930°C, heat preservation Time 3h), adopt the method and steps with embodiment 1, obtain the elastoplastic property parameter of Zr-N gradient modification layer and see Table 3.

[0053] Table 3 Elastoplastic properties parameters of Zr-N gradient modified layer on Ti6Al4V surface

[0054] .

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Abstract

The invention discloses a quantitative characterization method of the elastoplasticity performance parameter of a gradient modification layer on the surface of titanium alloy and belongs to the fieldof metal surface modification layer performance characterization. The gradient modification layer on the surface of titanium alloy includes a deposition layer and a diffusion layer. The method includes: firstly, determining thicknesses of the deposition layer and diffusion layer by means of glow discharge spectrograph and scanning electron microscope; secondly, by means of nanoindentation test andfinite element numerical simulation inversion analysis algorithm, determining the elastoplasticity performance parameters of a titanium alloy substrate and the deposition layer, during the nanoindentation test of the deposition layer, depth of indentation should be less than the thickness of the deposition layer by 1 / 10 in order to avoid the influence of the diffusion layer and the substrate; finally, determining the elastoplasticity performance parameter of the diffusion layer by a mathematical linear simplification model. The method is easy to carry out and is accurate and reliable in result, and can be used for quantitatively characterizing the elastoplasticity performance parameter of the gradient modification layer on the surface of titanium alloy.

Description

technical field [0001] The invention relates to a quantitative characterization method for elastic-plastic performance parameters of a gradient modified layer on the surface of a titanium alloy, and belongs to the field of mechanical performance characterization of the metal surface modified layer. Background technique [0002] Due to its high specific strength, excellent corrosion resistance and biocompatibility, titanium alloys are widely used in aerospace, chemical industry, sports equipment and biomedical fields. However, titanium alloy has low hardness and high friction coefficient, and its surface mechanical properties are obviously inferior to those of commonly used iron-based metal structural materials, which limits its application range and affects the safety and reliability of its structure. Therefore, modifying the surface of titanium alloy to improve its surface load resistance is a proposition that needs to be solved in the application of titanium alloy. At pre...

Claims

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Application Information

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IPC IPC(8): G01N3/42
CPCG01N3/42G01N2203/0019G01N2203/0078
Inventor 马永王志刚于盛旺林乃明杨瞾唐宾
Owner TAIYUAN UNIV OF TECH
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