阅读说明：本技术 Ta15热轧板材组织控制的方法 (TA15 hot rolling plate structure control method ) 是由 李昌高 陈鑫 代广霖 李露 何小林 郭江雷 于 2020-05-20 设计创作，主要内容包括：本发明涉及热轧板材领域,尤其是一种优化TA15的组织形貌和类型,同时让室温力学性能和高温力学性能均满足要求的TA15热轧板材组织控制的方法,包括如下步骤：a、成分控制：在原料海绵钛中配入纯铝、钛钼合金、海绵锆、铝钒合金及钛白粉；b、锻造开坯；c、粗轧开坯两火,其中,粗轧加热温度按相变点以下50℃控制；d、依次进行精轧第一轧程开坯和精轧第二轧程成材,其中,精轧加热温度按相变点以下100℃控制,精轧总变形率≥70％；精轧末轧程变形率≥30％,精轧终轧温度按650～700℃控制；g、退火。本发明尤其适用于TA15板材的组织控制工艺之中。(The invention relates to the field of hot rolled plates, in particular to a method for controlling the structure of a TA15 hot rolled plate, which optimizes the structure appearance and type of TA15 and simultaneously ensures that the room-temperature mechanical property and the high-temperature mechanical property meet the requirements, and comprises the following steps: a. controlling components: adding pure aluminum, titanium molybdenum alloy, sponge zirconium, aluminum vanadium alloy and titanium dioxide into the raw material of the sponge titanium; b. forging and cogging; c. two heating steps of rough rolling and cogging are carried out, wherein the heating temperature of the rough rolling is controlled at 50 ℃ below the phase transition point; d. performing finish rolling first rolling process cogging and finish rolling second rolling process rolling to form a finished product, wherein the finish rolling heating temperature is controlled at 100 ℃ below a phase change point, and the finish rolling total deformation rate is more than or equal to 70%; the deformation rate of the final rolling process of finish rolling is more than or equal to 30 percent, and the finish rolling temperature of the finish rolling is controlled according to 650-700 ℃; g. and (6) annealing. The invention is particularly suitable for the tissue control process of the TA15 plate.)

A TA15 method for hot rolled sheet texture control, comprising the steps of:

a. controlling components: pure aluminum, titanium molybdenum alloy, sponge zirconium, aluminum vanadium alloy and titanium dioxide are added into the raw material sponge titanium, and the mass percentage of the corresponding components in the obtained mixture meets the following range: al: 6.2-6.8%, Mo: 0.8-1.5%, V: 1-1.5%, Zr: 1.8-2.2% and O: 0.06-0.09%;

b. forging and cogging;

c. two heating steps of rough rolling and cogging are carried out, wherein the heating temperature of the rough rolling is controlled at 50 ℃ below the phase transition point;

d. performing finish rolling first rolling process cogging and finish rolling second rolling process rolling to form a finished product, wherein the finish rolling heating temperature is controlled at 100 ℃ below a phase change point, and the finish rolling total deformation rate is more than or equal to 70%; the deformation rate of the final rolling process of finish rolling is more than or equal to 30 percent, and the finish rolling temperature of the finish rolling is controlled according to 650-700 ℃;

e. and (6) annealing.

2. The TA15 hot rolled sheet structure control method of claim 1, wherein: the annealing mode is air cooling.

Technical Field

The invention relates to the field of hot rolled plates, in particular to a TA15 hot rolled plate structure control method.

Background

The titanium and the titanium alloy have excellent performance and can be widely applied to various industries of national economy and national defense industry. With the development of aviation technology, the application of titanium in the aviation field is expanded due to the characteristics of excellent comprehensive performance and light weight of titanium. TA15 as a near-alpha type titanium alloy has obvious advantages in room temperature mechanical property and high temperature mechanical property except for keeping the light weight characteristic of the titanium-based material. However, GJB 2505A has clear requirements on the tissue type of TA15 plates, and in addition to effective fragmentation of the original beta grain boundary, TA15 needs to be specially evaluated according to a tissue rating diagram. In TA15, particularly in hot-rolled plates, there are contradictions that the original structure is difficult to break if the heating temperature is too high, and the working plasticity is difficult to ensure if the heating temperature is too low during hot working.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for controlling the TA15 hot rolled plate structure, which optimizes the structure morphology and type of TA15 and simultaneously enables the room-temperature mechanical property and the high-temperature mechanical property to meet the requirements.

The technical scheme adopted by the invention for solving the technical problems is as follows: TA15 method for controlling hot rolled plate structure, comprising the following steps: a. controlling components: pure aluminum, titanium molybdenum alloy, sponge zirconium, aluminum vanadium alloy and titanium dioxide are added into the raw material sponge titanium, and the mass percentage of the corresponding components in the obtained mixture meets the following range: al: 6.2-6.8%, Mo: 0.8-1.5%, V: 1-1.5%, Zr: 1.8-2.2% and O: 0.06-0.09%; b. forging and cogging; c. two heating steps of rough rolling and cogging are carried out, wherein the heating temperature of the rough rolling is controlled at 50 ℃ below the phase transition point; d. performing finish rolling first rolling process cogging and finish rolling second rolling process rolling to form a finished product, wherein the finish rolling heating temperature is controlled at 100 ℃ below a phase change point, and the finish rolling total deformation rate is more than or equal to 70%; the deformation rate of the final rolling process of finish rolling is more than or equal to 30 percent, and the finish rolling temperature of the finish rolling is controlled according to 650-700 ℃; g. and (6) annealing.

Further, the method comprises the following steps: the annealing mode is air cooling.

The invention has the beneficial effects that: the invention enlarges the alpha phase region by adjusting the distribution ratio so as to improve the adjustable upper limit of the heating temperature range, improve the processing plasticity and facilitate the realization of the subsequent deformation rate; by controlling the temperature below the beta transformation point, the material structure is prevented from being deteriorated due to overhigh heating temperature, and the structure is favorably crushed in the subsequent rolling process; the effective crushing of the original tissue is completed by controlling the total deformation rate of the finish rolling and the deformation rate of the final rolling stroke, so as to realize the condition of generating the primary alpha phase; the original structure is more thoroughly and comprehensively crushed by controlling the finishing rolling temperature at a lower temperature, so that the alpha phase is more uniformly generated in the recrystallization process, and an equiaxial bimodal structure is formed. The invention is particularly suitable for the tissue control process of the TA15 plate.

Drawings

FIG. 1 is a schematic representation of the texture of a hot rolled plate of a standard finished product of the invention.

FIG. 2 is a schematic view of the texture of the hot-rolled sheet obtained in example 1.

FIG. 3 is a schematic view of the texture of the hot-rolled sheet obtained in example 2.

FIG. 4 is a schematic view of the texture of the hot-rolled sheet obtained in example 3.

FIG. 5 is a schematic view of the texture of the hot-rolled sheet obtained in example 4.

Detailed Description

TA15 method for controlling hot rolled plate structure, comprising the following steps: a. controlling components: pure aluminum, titanium molybdenum alloy, sponge zirconium, aluminum vanadium alloy and titanium dioxide are added into the raw material sponge titanium, and the mass percentage of the corresponding components in the obtained mixture meets the following range: al: 6.2-6.8%, Mo: 0.8-1.5%, V: 1-1.5%, Zr: 1.8-2.2% and O: 0.06-0.09%; b. forging and cogging; c. two heating steps of rough rolling and cogging are carried out, wherein the heating temperature of the rough rolling is controlled at 50 ℃ below the phase transition point; d. performing finish rolling first rolling process cogging and finish rolling second rolling process rolling to form a finished product, wherein the finish rolling heating temperature is controlled at 100 ℃ below a phase change point, and the finish rolling total deformation rate is more than or equal to 70%; the deformation rate of the final rolling process of finish rolling is more than or equal to 30 percent, and the finish rolling temperature of the finish rolling is controlled according to 650-700 ℃; g. and (6) annealing.

The process flow mainly comprises the following steps: vacuum consumable melting ingot casting → forging cogging → rough rolling cogging → finish rolling finished product. The method is used for increasing the proportion of alpha-phase stable elements and reducing the proportion of beta-phase stable elements in an adjustable range on the premise of ensuring that the components meet the requirements of related technical standards, wherein the titanium sponge raw material is added with Al: 6.2-6.8%, Mo: 0.8-1.5%, V: 1-1.5%, Zr: 1.8-2.2% and O: 0.06-0.09%, and through the above component proportions, the requirements of technical standards on components can be met, and simultaneously the range of an alpha phase region of the material is enlarged as much as possible, so that the upper limit of the executable heating temperature is improved, and conditions are created for realizing the total deformation rate and the final rolling deformation rate as much as possible in the follow-up process. Secondly, the invention has corresponding requirements on temperature and deformation rate: by controlling the heating temperature, the deterioration of the tissue in the heating process is avoided; the effective crushing of the original structure is realized by controlling the total deformation rate and the final deformation rate of the finish rolling and controlling the finish rolling temperature of the finish rolling, and conditions are created for generating equiaxial primary alpha phase in the recrystallization process. The invention can completely crush the original structure of the TA15 hot rolled plate and generate an equiaxial bimodal structure in the subsequent heat treatment process, and the structure type completely meets the requirement of the GJB 2505A on TA 15. Meanwhile, the invention has strong operability. The alpha phase region is enlarged by adjusting the components, so that the upper limit of the executable heating temperature is improved, and the problem of poor processing plasticity caused by heating at a lower temperature is relieved to a certain extent. In addition, the invention not only enables TA15 organization to meet the requirements, but also enables the performance index to completely meet the requirements of GJB 2505A.