CN-122007152-A - Gradient nanostructure controlled titanium alloy plate beta region rolling deformation infiltration method

CN122007152ACN 122007152 ACN122007152 ACN 122007152ACN-122007152-A

Abstract

The invention relates to the technical field of metal material processing, and discloses a gradient nanostructure controlled titanium alloy plate beta zone rolling deformation infiltration method, which comprises the following steps of preprocessing a titanium alloy plate blank to remove surface defects; carrying out surface mechanical grinding treatment on the pretreated titanium alloy plate blank, and forming a gradient nano-structure layer on at least one surface of the titanium alloy plate blank; and rolling the processed titanium alloy plate blank in a beta phase region to obtain the titanium alloy plate with uniform tissue in the thickness direction. The SMAT technology is introduced into a pretreatment link before rolling in a beta phase region, and the gradient nano-structure layer constructed on the surface layer is utilized to regulate and control the deformation resistance, so that the permeation behavior in the thickness direction of deformation in the rolling process is improved from the source, and the homogenization of the titanium alloy plate structure is realized.

Inventors

WANG LIYA
YANG LIU
ZHENG YOUPING
ZHANG ZEYU

Assignees

成都先进金属材料产业技术研究院股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260312

Claims (10)

1. A gradient nanostructure-controlled titanium alloy plate beta region rolling deformation infiltration method is characterized by comprising the following steps: S1, preprocessing a titanium alloy plate blank to remove surface defects; s2, carrying out surface mechanical grinding treatment on the pretreated titanium alloy plate blank, and forming a gradient nano-structure layer on at least one surface of the titanium alloy plate blank; And S3, rolling the processed titanium alloy plate blank in a beta phase region to obtain the titanium alloy plate with uniform tissue in the thickness direction.
2. The gradient nanostructure controlled rolling deformation infiltration method of titanium alloy sheet material beta region according to claim 1, wherein in S1, the pretreatment comprises sequentially performed milling, cleaning and homogenizing annealing.
3. The gradient nanostructure controlled titanium alloy sheet material beta region rolling deformation infiltration method according to claim 2, wherein, The milling comprises six-sided milling of the slab to remove surface defects, wherein the single-sided removal thickness is in direct proportion to the initial thickness of the slab, and the surface flatness error after milling is controlled to be delta less than or equal to 0.1mm/m; the cleaning comprises alkaline degreasing, clear water rinsing, deionized water fine washing and hot air drying which are sequentially carried out, and the treatment time of each stage is in direct proportion to the square root of the surface area of the slab; The homogenizing annealing is carried out at a temperature lower than the beta transformation point of the titanium alloy, the heat preservation time is proportional to the thickness of the slab, and then the slab is slowly cooled to below 300 ℃.
4. The gradient nanostructure controlled rolling deformation infiltration method of titanium alloy sheet material in beta region according to claim 1, wherein in S2, the surface mechanical grinding treatment employs multi-size mixed pellets comprising pellets of at least two different diameters to impact the surface of the sheet material blank.
5. The gradient nanostructure controlled titanium alloy sheet material beta zone rolling deformation infiltration method according to claim 4, wherein in S2, the surface mechanical grinding treatment adopts a zone scanning strategy to divide a sheet material into a plurality of grid cells, the size of each grid cell is proportional to the square root of the thickness of the sheet material, and the treatment time of each grid cell is proportional to the thickness of the sheet material.
6. The gradient nanostructure controlled titanium alloy sheet beta zone rolling deformation infiltration method according to claim 5, wherein in S2, a gantry type multi-vibrator system is adopted in the surface mechanical grinding treatment process, the vibrator frequency f is 20-50Hz, the power of the subsystem is in direct proportion to the thickness and width of the sheet billet, and the surface temperature of the sheet billet in the treatment process is controlled to be less than or equal to 150 ℃.
7. The gradient nanostructure controlled rolling deformation infiltration method for the beta region of the titanium alloy sheet according to claim 1, wherein in the step S3, the rolling temperature T rolling =T β +ΔT 2 ,ΔT 2 of the beta region rolling is 10-30 ℃, the sheet preheating time T preheat =k7xh, the coefficient k 7 is 0.02-0.05H/mm, and the sheet core surface temperature difference deltat core-surface ≤0.05×T β after preheating.
8. The gradient nanostructure controlled titanium alloy sheet material beta region rolling deformation infiltration method according to claim 1, wherein in S3, beta phase region rolling adopts a multi-stage deformation strategy comprising rolling stages performed at least two different temperature intervals based on the difference in sheet material thickness.
9. The gradient nanostructure controlled titanium alloy sheet beta region rolling deformation infiltration method of claim 8, wherein the multi-stage deformation strategy comprises: The first rolling stage comprises the steps of taking 2-3 passes of N 1 =k 8 ×log(H),k 8 at the temperature T 1 =T rolling , and rolling a slab with the thickness of H 1 , wherein the single pass deformation is 8-12%; The second rolling stage is to roll a slab with the thickness of H 2 at the temperature of T 2 =T rolling -ΔT 3 and the pass number of k 8 ×log(H 1 ) and with the single-pass deformation of 6-10%; In the third rolling stage, the temperature T 3 =T rolling -ΔT 4 and the number of passes k 8 ×log(H 2 ) are adopted, the single-pass deformation is 5-8%, and the slab with the thickness of H 3 is rolled; Wherein, deltaT 3 is 20-40 ℃, deltaT 4 is 40-60 ℃.
10. The gradient nanostructure controlled rolling deformation infiltration method for a beta region of a titanium alloy sheet material according to claim 1, wherein the titanium alloy is one or more of TC4 and TA 15.

Description

Gradient nanostructure controlled titanium alloy plate beta region rolling deformation infiltration method Technical Field The invention relates to the technical field of metal material processing, in particular to a gradient nanostructure-controlled rolling deformation infiltration method for a beta region of a titanium alloy plate. Background The titanium alloy sheet has the problem of uneven structure during beta-phase zone rolling, so that the difference of the properties in the thickness direction is obvious. The preparation method is characterized in that the surface layer forms a lamellar tissue with higher strength and plasticity but lower impact energy due to rapid temperature drop and large deformation, and the core part forms a Wittig tissue with lower strength and plasticity but higher impact energy due to slow temperature drop and small deformation. The root of the non-uniformity is that the rolling deformation is difficult to transfer and permeate from the surface layer to the core, the surface layer deformation is large, the temperature is low, the core deformation is small, the temperature is high, the deformation is difficult to effectively permeate into the core, and the improvement of the overall performance of the plate is restricted. Aiming at the problem of nonuniform structure, the prior art is mainly improved by adopting an alpha+beta phase zone rolling method. The phase region material has higher yield strength and higher deformation resistance, is easier to permeate into the core part when deformed under the action of sufficient rolling force, and is beneficial to forming a more uniform bimodal structure. However, this method requires a high load-carrying capacity of the rolling plant, consumes a high amount of energy and may introduce other organizational defects. On the other hand, surface mechanical grinding (SMAT) has been widely used as an effective surface modification technique in post-treatment processes of materials such as magnesium alloy, aluminum alloy, copper zinc alloy, etc., to improve surface hardness, strength and wear resistance by introducing plastic deformation on the surface of the material to achieve grain refinement, but it has not been currently seen to be used for pretreatment before beta-phase zone rolling to improve deformation permeability. Therefore, there is a need in the art for a method of controlling rolling deformation penetration in the beta region of a titanium alloy sheet. Disclosure of Invention Therefore, the purpose of the embodiment of the invention is to provide a gradient nanostructure regulating and controlling titanium alloy plate beta region rolling deformation infiltration method, which introduces the SMAT technology into a pretreatment link before beta region rolling, utilizes a gradient nanostructure layer constructed on a surface layer to regulate and control deformation resistance, and aims to improve the thickness direction infiltration behavior of deformation in the rolling process from the source, thereby realizing homogenization of titanium alloy plate tissues. Based on the above object, the embodiment of the invention provides a gradient nanostructure controlled titanium alloy plate beta zone rolling deformation infiltration method, which comprises the following steps: S1, preprocessing a titanium alloy plate blank to remove surface defects; S2, carrying out surface mechanical grinding treatment on the pretreated titanium alloy plate blank, and forming a gradient nano-structure layer on at least one surface of the titanium alloy plate blank; And S3, rolling the processed titanium alloy plate blank in a beta phase region to obtain the titanium alloy plate with uniform tissue in the thickness direction. In some embodiments, in S1, the pretreatment includes sequentially performing milling, cleaning, and homogenizing annealing. In some embodiments, milling comprises six-sided milling of the slab to remove surface defects, wherein the single-sided removed thickness is proportional to the initial thickness of the slab, and the surface flatness error after milling is controlled to be delta less than or equal to 0.1mm/m; The cleaning comprises alkaline degreasing, clear water rinsing, deionized water fine washing and hot air drying which are sequentially carried out, and the treatment time of each stage is in direct proportion to the square root of the surface area of the slab; The homogenizing annealing is carried out at a temperature lower than the beta transformation point of the titanium alloy, the heat preservation time is proportional to the thickness of the slab, and then the slab is slowly cooled to below 300 ℃. In some embodiments, in S2, the surface mechanical grinding treatment impacts the slab surface with a multi-sized hybrid shot comprising at least two different diameter shots. In some embodiments, in S2, the surface mechanical grinding process employs a zoned scanning strategy to divide the slab into a plurality of gri