CN108687158B

CN108687158B - preparation method of isotropic molybdenum plate

Info

Publication number: CN108687158B
Application number: CN201810447470.0A
Authority: CN
Inventors: 范荣奎; 谢永华; 魏春肖
Original assignee: Chengdu Lian Hong Molybdenum Industry Co Ltd
Current assignee: Chengdu Lian Hong Molybdenum Industry Co Ltd
Priority date: 2018-05-11
Filing date: 2018-05-11
Publication date: 2019-12-17
Anticipated expiration: 2038-05-11
Also published as: CN108687158A

Abstract

The invention discloses a preparation method of an isotropic molybdenum plate. The method comprises the following steps: (1) the method comprises the following steps of (1) processing a molybdenum blank with the molybdenum content of more than 99% as a raw material at least twice through a high-speed forging process, wherein the impact energy instantaneously borne by a molybdenum plate at each time is 3-7 MJ, and the pass deformation is 30-50%; (2) rolling the product obtained in the step (1) at least once to enable the total deformation amount to reach 10-30%; (3) and heating the rolled product to 800-1200 ℃, and keeping the temperature for 60-120 min at the heating rate of 100-500 ℃/min. The molybdenum plate prepared by the method is almost flawless in the interior and is isotropic.

Description

Preparation method of isotropic molybdenum plate

Technical Field

The invention belongs to the technical field of metal template preparation, and particularly relates to a preparation method of an isotropic molybdenum plate.

Background

molybdenum parts used in the field of precision electronic components and other precision devices are often extremely complex in structure and have high requirements on the dimensional precision of the parts, for example: a slow wave structural member of the high-power traveling wave tube, a grid of the high-power transmitting tube, a liner of the armor piercing bomb and the like. To meet the performance and precision machining requirements of such products, it is a necessary condition that the molybdenum plate has isotropy or small anisotropy. The molybdenum plate manufactured by the prior art has obvious anisotropy, internal defects and poor machining performance due to the plate texture, so that the manufacturing requirements of the precision molybdenum part cannot be met.

Disclosure of Invention

aiming at the defects in the prior art, the invention provides the preparation method of the isotropic molybdenum plate, which can effectively solve the problems of anisotropy and insufficient machining performance of the molybdenum plate prepared by the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:

A method of making an isotropic molybdenum plate comprising the steps of:

(1) The method comprises the following steps of (1) processing a molybdenum blank with the molybdenum content of more than 99% as a raw material at least twice through a high-speed forging process, wherein the impact energy instantaneously borne by a molybdenum plate at each time is 3-7 MJ, and the pass deformation is 30-50%;

(2) Rolling the product obtained in the step (1) at least once to enable the total deformation amount to reach 10-30%;

(3) And heating the rolled product to 800-1200 ℃, and keeping the temperature for 60-120 min at the heating rate of 100-500 ℃/min.

Further, the specific process of the high-speed forging process in the step (1) is as follows: the forging speed is 100-120 m/s; the impact energy instantaneously born by the molybdenum billet each time is 4.6MJ, and the pass deformation is 35%.

Further, the rolling in the step (2) is warm rolling or cold rolling.

Further, the temperature in the warm rolling process is 750-1000 ℃.

Further, in the step (3), the temperature is 900 ℃, the heating rate is 240 ℃/min, and the temperature is kept for 80 min.

the invention has the beneficial effects that:

1. The high-purity molybdenum blank with the molybdenum content of more than 99.98 percent is used as a raw material for preparing the molybdenum plate, so that the adverse effect of impurity elements on the performance of the molybdenum plate is reduced.

2. The high-speed and high-energy forging process breaks the internal crystal grains into fine isometric crystal grains, a plurality of micro defects existing in the molybdenum billet are pressed and disappear, and due to the extremely high deformation speed, newly generated micro cracks are pressed and disappear again before expanding, so that the molybdenum plate with few internal defects is obtained.

3. the thickness size precision of the molybdenum plate is improved by the total deformation of the proper molybdenum plate after warm rolling or cold rolling so as to meet the requirement of subsequent precision machining; finally, the molybdenum plate is ensured to have isotropic characteristics through homogenization heat treatment.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.

Example 1

A method of making an isotropic molybdenum plate comprising the steps of:

(1) Using a molybdenum blank with the molybdenum content of 99.995 percent as a raw material, and utilizing a press machine to perform high-speed forging process processing twice according to the product requirements, wherein the forging speed of each time is 120m/s, the impact energy instantaneously born by the molybdenum blank is 4.6MJ, and the pass deformation is 35 percent;

(2) rolling the product obtained in the step (1) twice by cold rolling to ensure that the total deformation of the product reaches 30 percent and the deformation of each rolling is the same;

(3) and (3) heating the cold-rolled product to 900 ℃ at the speed of 240 ℃/min, and preserving the heat for 80min to prepare the isotropic molybdenum plate.

Example 2

A method of making an isotropic molybdenum plate comprising the steps of:

(1) Taking a molybdenum blank with the molybdenum content of 99.992% as a raw material, and carrying out three times of high-speed forging processing by using a press according to the product requirement, wherein the forging speed of each time is 100m/s, the impact energy instantaneously born by the molybdenum blank each time is 3MJ, and the pass deformation is 30%;

(2) rolling the product obtained in the step (1) once at 750 ℃ to ensure that the total deformation of the product reaches 20 percent, and the deformation of each rolling is the same;

(3) And (3) heating the product after warm rolling to 1000 ℃ at the speed of 200 ℃/min, and preserving the heat for 60min to prepare the isotropic molybdenum plate.

Example 3

A method of making an isotropic molybdenum plate comprising the steps of:

(1) taking a molybdenum blank with the molybdenum content of more than 99.994 percent as a raw material, and performing four times of high-speed forging process processing by using a press according to the product requirement, wherein the forging speed of each time is 110m/s, the impact energy instantaneously born by the molybdenum blank each time is 7MJ, and the pass deformation is 50 percent;

(2) Rolling the product obtained in the step (1) for three times at 1000 ℃ to ensure that the total deformation of the product reaches 28 percent, and the deformation of each rolling is the same;

(3) And heating the product after warm rolling to 1200 ℃ at the speed of 300 ℃/min, and preserving the heat for 120min to prepare the isotropic molybdenum plate.

Comparative example 1

compared with the example 1, the high-speed forging process is absent in the step (1), and the rest of the process is the same as the example 1.

Comparative example 2

compared with the example 1, the temperature raising and maintaining process is lacked in the step (3), and the rest processes are the same as the example 1.

Comparative example 3

Compared with the embodiment 1, the high-speed forging process is absent in the step (1), the heating and heat preservation treatment process is absent in the step (3), and the rest processes are the same as the embodiment 1.

detection of

The performance parameters of the molybdenum plates prepared in examples 1 to 3 and comparative examples 1 to 3 were measured under the same conditions, and the results are shown in table 1.

TABLE 1 comparison of molybdenum plate Performance parameters

	Gap Rate (%)	content of impurities (%)	Isotropy
				Example 1	0.50	0.005	Is that
Example 2	0.66	0.008	is that
				Example 3	0.55	0.006	is that
Comparative example 1	5.6	0.0018	Is that
				Comparative example 2	1.32	0.001	Whether or not
Comparative example 3	7.8	0.0019	whether or not

As can be seen from the data in Table 1, the molybdenum plates prepared in examples 1 to 3 have higher quality than the molybdenum plates prepared in comparative examples, particularly the molybdenum plate prepared in example 1 has the best effect, and the quality detection data of the molybdenum plates prepared in comparative examples 1 to 3 show that the high-speed forging process and the temperature-raising and heat-preserving treatment have great influence on the performance of the molybdenum plates, so that the molybdenum plates with almost no defect inside and isotropy can be prepared only by matching the steps and the process parameters mentioned in the method.

Claims

1. A method for preparing an isotropic molybdenum plate, comprising the steps of: