CN110819923A - Heat treatment process of titanium plate blank - Google Patents
Heat treatment process of titanium plate blank Download PDFInfo
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- CN110819923A CN110819923A CN201911154622.9A CN201911154622A CN110819923A CN 110819923 A CN110819923 A CN 110819923A CN 201911154622 A CN201911154622 A CN 201911154622A CN 110819923 A CN110819923 A CN 110819923A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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Abstract
The invention provides a heat treatment process of a titanium plate blank, which comprises the following steps: step one, pretreatment, namely cleaning the surface of a titanium plate blank; step two, placing the titanium plate blank in an annealing furnace filled with inert gas, and heating for one time in an arithmetic progression mode under normal pressure to raise the temperature in the annealing furnace to 450 +/-10 ℃; introducing inert gas until the pressure reaches 100-120 mbar, and preserving heat; thirdly, carrying out secondary heating in an arithmetic progression mode to raise the temperature in the annealing furnace to 690-700 ℃; step four, preserving heat at 690-700 ℃; step five, reducing the pressure in the annealing furnace to a normal pressure state and reducing the pressure to a room temperature state; step six, performing cold treatment by using liquid nitrogen; and step seven, rapidly heating the titanium plate blank in the step six to the normal temperature. The titanium plate blank subjected to the heat treatment of the titanium plate blank has the advantages of good mechanical property, low thermal stress, high ductility, difficult fracture, no crack, no drum skin and the like.
Description
Technical Field
The invention relates to the technical field of heat treatment of titanium materials, in particular to a heat treatment process of a titanium plate blank.
Background
The distribution range of the metallic titanium in the crust is wide, the worldwide reserves are about 34 tons, and the metallic titanium is known as a rising third metal which is only inferior to iron and aluminum, has rich reserves, and provides a main raw material source for the production and development of the metallic titanium and the titanium alloy. Titanium is a silvery white transition metal, has the characteristics of small density, high strength, metallic luster, strong corrosion resistance and low heat conductivity, has stable chemical properties, no toxicity and magnetism, high temperature resistance, low temperature resistance, good biocompatibility and strong surface decoration property, is widely applied to the fields of aerospace, ships and submarines, petrochemical industry, power generation, pharmacy, medical appliances, seawater desalination, sports goods, living goods and the like, is prime to reputations of space metal, future metal, marine metal and the like, and has important application value and wide application prospect.
The titanium slab is generally formed by casting, and has the use requirements of high strength, high ductility and high corrosion resistance so as to ensure the processing of cutting, extending, welding and the like when in use, and various parameters of the strength, the ductility, the heat conductivity and the like of the titanium slab depend on the heat treatment process of the titanium slab. If the titanium plate blank is not well heat treated, the surface plane of the titanium plate blank may have cracks, bulges, is easy to corrode and the like, and the problems that the thickness of each part of the titanium plate blank in the extension process is different, the titanium plate blank is broken, the hardness of the extended titanium plate blank is reduced, and the titanium plate blank is easy to crack and the like may also occur.
At present, most titanium plate blanks are annealed once or repeatedly or in a step mode, and then are subjected to temperature reduction treatment after heat preservation for a certain time, so that the treatment time is long, the cost is high, and the ductility, the strength and the corrosion resistance of the treated titanium plate blanks cannot meet the design requirements.
Therefore, it is urgently needed to develop a heat treatment process for titanium slabs, which greatly reduces the heat treatment cost of the titanium slabs on the premise of ensuring the surface and internal quality of the titanium slabs.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a heat treatment process for a titanium slab, which is convenient to operate, highly economical and highly adaptable. The metal heat treatment is a process of heating a metal or alloy workpiece in a certain medium to a proper temperature, keeping the temperature for a certain time, cooling the workpiece in different media at different speeds, and controlling the performance of the workpiece by changing the microstructure of the surface or the interior of a metal material. The heat treatment of the titanium plate blank is mainly based on the stress relief of the titanium plate blank, and the mechanical property and the stability of the titanium plate blank are improved, so that the ductility, the hardness, the corrosion resistance and other properties of the titanium plate blank are ensured.
The technical scheme for realizing the purpose of the invention is as follows: a heat treatment process of a titanium plate blank comprises the following steps:
the method comprises the following steps of firstly, preprocessing, namely polishing by using abrasive paper to remove oxide skins and nicks, and then cleaning the surface of a titanium plate blank by using alcohol. The sand paper can remove oxide layers, nicks and the like on the titanium plate blank, so that the surface of the titanium plate blank is smooth and flat. The alcohol can remove impurities such as oil stains, dust and the like on the surface of the titanium plate blank, and avoids the phenomenon that the oil stains, dust and the like are deposited or attached to the surface of the titanium plate blank during the subsequent treatment of the titanium plate blank or react with the titanium plate at high temperature to influence the quality and the appearance of the titanium plate blank.
Step two, placing the titanium plate blank in an annealing furnace filled with inert gas, and heating for one time in an arithmetic progression mode under normal pressure to raise the temperature in the annealing furnace to 450 +/-10 ℃; introducing inert gas into the annealing furnace until the pressure in the annealing furnace reaches 100-120 mbar, and keeping the temperature at 450 +/-10 ℃ for 60-80 min;
thirdly, carrying out secondary heating in an arithmetic progression mode to raise the temperature in the annealing furnace to 690-700 ℃;
step four, preserving the heat for 120-180 min at 690-700 ℃ in an annealing furnace under the pressure of 100-120 mbar;
step five, after the heat preservation in the step five is finished, reducing the pressure in the annealing furnace to a normal pressure state, and reducing the pressure to a room temperature state at a speed of 10 ℃/min;
step six, performing cooling treatment by using liquid nitrogen, wherein the cooling treatment comprises performing primary cooling treatment at-20 to-50 ℃ for 30-50 min, performing secondary cooling treatment at-100 to-120 ℃ for 20-40 min, and performing tertiary cooling treatment at-150 to-220 ℃ for 10-30 min;
and seventhly, rapidly heating the titanium plate blank in the sixth step to the normal temperature at the speed of 20 ℃/min.
The heat treatment of the titanium plate blank is mainly twice annealing to eliminate the stress of the titanium plate blank and the hydrogen element of the titanium plate blank, and the annealing of the titanium plate blank is mainly carried out under the protection of inert gas; annealing the titanium plate blank, cooling to room temperature, performing cold treatment, rapidly returning to the room temperature, wherein the cold-treated titanium plate blank has a certain crystal orientation, so that the titanium plate blank is subjected to shrinkage plastic deformation, and the titanium plate blank has good mechanical properties and stability.
In the preferred embodiment of the invention, in order to increase the temperature raising speed of the titanium slab at a fixed rate, the problem that when the temperature rises sharply, the surface and the inner temperature of the titanium slab have large difference to generate large thermal stress, and the mechanical property of the titanium slab is influenced is avoided. In the second step, the equation of the arithmetic progression is anAnd n is an integer of =25+ (n-1) × 5 ℃/min. On the basis of 25 ℃ (normal temperature), the temperature of the titanium plate blank is raised by 5 ℃ per minute until the temperature of the titanium plate blank reaches 450 +/-10 ℃, so that on one hand, the uniformity of the surface temperature and the internal temperature of the titanium plate blank is ensured, and the mechanical property of the titanium plate blank is improved; on the other hand, the heating time can be reduced, the working efficiency is improved, and the production cost is reduced.
In the preferred embodiment of the invention, in order to increase the temperature raising speed of the titanium slab at a fixed rate, the problem that when the temperature rises sharply, the surface and the inner temperature of the titanium slab have large difference to generate large thermal stress, and the mechanical property of the titanium slab is influenced is avoided. In step three, the equation of the arithmetic progression is: a isk=450+ (n-1) × 10 ℃/min, k being an integer. The temperature of the titanium plate blank is increased by 10 ℃ per minute on the basis of 450 ℃ until the temperature of the titanium plate blank reaches 690-700 ℃, so that the uniformity of the temperature of the surface and the inside of the titanium plate blank is ensured, and the mechanical property of the titanium plate blank is improved.
In a preferred embodiment of the present invention, in step six, the temperatures of the three cold treatments are: the primary cooling treatment is carried out at-30 to-40 ℃, the secondary cooling treatment is carried out at-110 +/-5 ℃, and the third cooling treatment is carried out at-180 to-200 ℃.
In a preferred embodiment of the invention, in the fifth step, the cooling manner of the titanium plate blank from 690-700 ℃ to the normal temperature comprises air cooling, water cooling and liquid nitrogen.
In the preferred embodiment of the invention, the titanium plate blank is cooled from 690-700 ℃ to 450 +/-10 ℃ by air cooling, then cooled to 250 +/-10 ℃ by water cooling at 450 +/-10 ℃, and finally cooled to the normal temperature by liquid nitrogen.
As a further improvement of the heat treatment process of the titanium plate blank of the present invention, in order to improve the corrosion resistance of the titanium plate blank, improve the service life of the titanium plate blank and improve the appearance of the titanium plate blank, the heat treatment process of the titanium plate blank further comprises a step eight of placing the titanium plate blank in an electrolytic cell under a vacuum condition to perform electrolytic oxidation treatment, and generating an oxide film on the surface of the titanium plate blank. At normal temperature, the oxide film attached to the surface of the titanium plate blank can prevent the interior of the titanium plate blank from being corroded.
Compared with the prior art, the beneficial effects of the invention are as follows:
1. the invention changes the heating mode of optimizing the heating treatment process of the titanium plate blank, and heats the titanium plate blank in the mode of 5 ℃ and 10 ℃ arithmetic progression, so that the temperature difference between the inside and the surface of the titanium plate blank is reduced, the thermal stress inside the titanium plate blank is reduced, and the mechanical property of the titanium plate blank is ensured.
2. After the heating treatment is finished, the titanium plate blank is subjected to cold treatment, so that the titanium plate blank is subjected to shrinkage plastic deformation, and the mechanical property of the titanium plate blank is improved.
Drawings
FIG. 1 is a flow chart of a heat treatment process of a titanium slab in examples 1 and 2 of the present invention;
fig. 2 is a flowchart of a heat treatment process of a titanium slab in example 3 of the present invention.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1:
referring to fig. 1, fig. 1 is a flow chart of a heat treatment process for a titanium slab according to the present invention, and in the present embodiment, the heat treatment process for the titanium slab includes the following steps:
the method comprises the steps of firstly, preprocessing, namely polishing by using abrasive paper with the granularity of 10 mu m to remove oxide skin and nicks, cleaning the surface of a titanium plate blank by using 70-80% alcohol for 2-3 times, and wiping the titanium plate blank for later use. In this embodiment, the sand paper can remove the oxide layer, the nicks, and the like on the titanium plate blank, so that the surface of the titanium plate blank is smooth and flat. The alcohol can remove impurities such as oil stains, dust and the like on the surface of the titanium plate blank, and avoids the phenomenon that the oil stains, dust and the like are deposited or attached to the surface of the titanium plate blank during the subsequent treatment of the titanium plate blank or react with the titanium plate at high temperature to influence the quality and the appearance of the titanium plate blank.
Step two, placing the titanium plate blank in an annealing furnace filled with inert gas, and heating for one time in an arithmetic progression mode under normal pressure to raise the temperature in the annealing furnace to 450 +/-10 ℃; and introducing inert gas into the annealing furnace until the pressure in the annealing furnace reaches 100-120 mbar, and keeping the temperature at 450 +/-10 ℃ for 60-80 min.
And step three, carrying out secondary heating in an arithmetic progression mode to raise the temperature in the annealing furnace to 690-700 ℃.
In order to increase the temperature rising speed of the titanium plate blank at a fixed speed, the phenomenon that the mechanical property of the titanium plate blank is influenced due to large thermal stress generated by large temperature difference between the surface and the interior of the titanium plate blank when the temperature rises sharply is avoided.
Step four, preserving the heat for 120-180 min at 690-700 ℃ in an annealing furnace under the pressure of 100-120 mbar;
and step five, after the heat preservation in the step five is finished, reducing the pressure in the annealing furnace to a normal pressure state, and reducing the pressure to a room temperature state at a speed of 10 ℃/min.
And step six, performing cooling treatment by using liquid nitrogen, wherein the cooling treatment comprises performing primary cooling treatment at-20 to-50 ℃ for 30-50 min, performing secondary cooling treatment at-100 to-120 ℃ for 20-40 min, and performing tertiary cooling treatment at-150 to-220 ℃ for 10-30 min.
And seventhly, rapidly heating the titanium plate blank in the sixth step to the normal temperature at the speed of 20 ℃/min.
Example 2:
referring to fig. 1, fig. 1 is a flow chart of a heat treatment process for a titanium slab according to the present invention, and in the present embodiment, the heat treatment process for the titanium slab includes the following steps:
the method comprises the steps of firstly, preprocessing, namely polishing by using abrasive paper with the granularity of 12-18 mu m to remove oxide skin and nicks, cleaning the surface of a titanium plate blank by using 85-95% alcohol for 1-3 times, and wiping the titanium plate blank for later use. In this embodiment, the sand paper can remove the oxide layer, the nicks, and the like on the titanium plate blank, so that the surface of the titanium plate blank is smooth and flat. The alcohol can remove impurities such as oil stains, dust and the like on the surface of the titanium plate blank, and avoids the phenomenon that the oil stains, dust and the like are deposited or attached to the surface of the titanium plate blank during the subsequent treatment of the titanium plate blank or react with the titanium plate at high temperature to influence the quality and the appearance of the titanium plate blank.
Step two, placing the titanium plate blank in an annealing furnace filled with inert gas, and heating for one time in an arithmetic progression mode under normal pressure to raise the temperature in the annealing furnace to 450 +/-10 ℃; and introducing inert gas into the annealing furnace until the pressure in the annealing furnace reaches 100-120 mbar, and keeping the temperature at 450 +/-10 ℃ for 60-80 min.
In order to increase the temperature rising speed of the titanium plate blank at a fixed speed, the phenomenon that the mechanical property of the titanium plate blank is influenced due to large thermal stress generated by large temperature difference between the surface and the interior of the titanium plate blank when the temperature rises sharply is avoided. In the above step, the equation of the arithmetic progression is anAnd n is an integer of =25+ (n-1) × 5 ℃/min. Heating the titanium plate blank at the temperature of 5 ℃ per minute on the basis of 25 ℃ (normal temperature) until the temperature of the titanium plate blank reaches 450 +/-10 ℃, wherein n =130 when the temperature of the titanium plate blank is increased to 450 +/-10 ℃, so that the uniformity of the temperature of the surface and the interior of the titanium plate blank is ensured, and the mechanical property of the titanium plate blank is improved; on the other hand, the heating time can be reduced, the working efficiency is improved, and the production cost is reduced.
And step three, carrying out secondary heating in an arithmetic progression mode to raise the temperature in the annealing furnace to 690-700 ℃. In order to increase the temperature rising speed of the titanium plate blank at a fixed speed, the phenomenon that the mechanical property of the titanium plate blank is influenced due to large thermal stress generated by large temperature difference between the surface and the interior of the titanium plate blank when the temperature rises sharply is avoided. In the above steps, the equation of the arithmetic progression is: a isk=450+ (n-1) × 10 ℃/min, k being an integer. Heating the titanium plate blank at the temperature of 10 ℃ per minute on the basis of 450 ℃ until the temperature of the titanium plate blank is reachedThe temperature of the titanium plate blank is 690-700 ℃, and in the embodiment, when the temperature of the titanium plate blank is increased to 700 ℃, k = 70. Thereby ensuring the uniformity of the temperature of the surface and the inside of the titanium plate blank and improving the mechanical property of the titanium plate blank.
Step four, preserving the heat for 120-180 min at 690-700 ℃ in an annealing furnace under the pressure of 100-120 mbar;
and step five, after the heat preservation in the step five is finished, reducing the pressure in the annealing furnace to a normal pressure state, and reducing the pressure to a room temperature state at a speed of 10 ℃/min. In this embodiment, the titanium plate blank is cooled after being subjected to high temperature treatment, and in order to improve the cooling efficiency on the basis of ensuring the quality of the titanium plate blank, in the fifth step, the cooling manner when the titanium plate blank is reduced from 690 to 700 ℃ to normal temperature includes air cooling, water cooling, and liquid nitrogen. Preferably, the titanium plate blank is cooled from 690-700 ℃ to 450 +/-10 ℃ by air cooling, then cooled to 250 +/-10 ℃ by water cooling at 450 +/-10 ℃, and finally cooled to the normal temperature by liquid nitrogen.
And step six, performing cooling treatment by using liquid nitrogen, wherein the cooling treatment comprises performing primary cooling treatment at-20 to-50 ℃ for 30-50 min, performing secondary cooling treatment at-100 to-120 ℃ for 20-40 min, and performing tertiary cooling treatment at-150 to-220 ℃ for 10-30 min. As a further optimization of the titanium slab cold treatment step in this embodiment, the temperatures of the three cold treatments are: the primary cooling treatment is carried out at-30 to-40 ℃, the secondary cooling treatment is carried out at-110 +/-5 ℃, and the third cooling treatment is carried out at-180 to-200 ℃.
And seventhly, rapidly heating the titanium plate blank in the sixth step to the normal temperature at the speed of 20 ℃/min.
Example 3:
referring to fig. 2, fig. 2 is a flow chart of another heat treatment process for a titanium slab of the present invention, and in this embodiment, the heat treatment process for the titanium slab includes the following steps:
the method comprises the steps of firstly, preprocessing, namely polishing by using sand paper with the granularity of 15 mu m to remove oxide skin and nicks, cleaning the surface of a titanium plate blank by using 70-90% alcohol for 2-3 times, and wiping for later use. In this embodiment, the sand paper can remove the oxide layer, the nicks, and the like on the titanium plate blank, so that the surface of the titanium plate blank is smooth and flat. The alcohol can remove impurities such as oil stains, dust and the like on the surface of the titanium plate blank, and avoids the phenomenon that the oil stains, dust and the like are deposited or attached to the surface of the titanium plate blank during the subsequent treatment of the titanium plate blank or react with the titanium plate at high temperature to influence the quality and the appearance of the titanium plate blank.
Step two, placing the titanium plate blank in an annealing furnace filled with inert gas, and heating for one time in an arithmetic progression mode under normal pressure to raise the temperature in the annealing furnace to 450 +/-10 ℃; and introducing inert gas into the annealing furnace until the pressure in the annealing furnace reaches 100-120 mbar, and keeping the temperature at 450 +/-10 ℃ for 60-80 min. In order to increase the temperature rising speed of the titanium plate blank at a fixed speed, the phenomenon that the mechanical property of the titanium plate blank is influenced due to large thermal stress generated by large temperature difference between the surface and the interior of the titanium plate blank when the temperature rises sharply is avoided. In the above step, the equation of the arithmetic progression is anAnd n is an integer of =25+ (n-1) × 5 ℃/min. Heating the titanium plate blank at the temperature of 5 ℃ per minute on the basis of 25 ℃ (normal temperature) until the temperature of the titanium plate blank reaches 450 +/-10 ℃, wherein n =130 when the temperature of the titanium plate blank is increased to 450 +/-10 ℃, so that the uniformity of the temperature of the surface and the interior of the titanium plate blank is ensured, and the mechanical property of the titanium plate blank is improved; on the other hand, the heating time can be reduced, the working efficiency is improved, and the production cost is reduced.
And step three, carrying out secondary heating in an arithmetic progression mode to raise the temperature in the annealing furnace to 690-700 ℃. In order to increase the temperature rising speed of the titanium plate blank at a fixed speed, the phenomenon that the mechanical property of the titanium plate blank is influenced due to large thermal stress generated by large temperature difference between the surface and the interior of the titanium plate blank when the temperature rises sharply is avoided. In the above steps, the equation of the arithmetic progression is: a isk=450+ (n-1) × 10 ℃/min, k being an integer. Heating the titanium plate blank at the temperature of 10 ℃ per minute on the basis of 450 ℃ until the temperature of the titanium plate blank reaches 690-700 ℃, wherein in the embodiment, when the temperature of the titanium plate blank is increased to 700 ℃, k = 70. Thereby ensuring the uniformity of the temperature of the surface and the inside of the titanium plate blank and improving the mechanical property of the titanium plate blank.
Step four, preserving the heat for 120-180 min at 690-700 ℃ in an annealing furnace under the pressure of 100-120 mbar;
and step five, after the heat preservation in the step five is finished, reducing the pressure in the annealing furnace to a normal pressure state, and reducing the pressure to a room temperature state at a speed of 10 ℃/min. In this embodiment, the titanium plate blank is cooled after being subjected to high temperature treatment, and in order to improve the cooling efficiency on the basis of ensuring the quality of the titanium plate blank, in the fifth step, the cooling manner when the titanium plate blank is reduced from 690 to 700 ℃ to normal temperature includes air cooling, water cooling, and liquid nitrogen. Preferably, the titanium plate blank is cooled from 690-700 ℃ to 450 +/-10 ℃ by air cooling, then cooled to 250 +/-10 ℃ by water cooling at 450 +/-10 ℃, and finally cooled to the normal temperature by liquid nitrogen.
And step six, performing cooling treatment by using liquid nitrogen, wherein the cooling treatment comprises performing primary cooling treatment at-20 to-50 ℃ for 30-50 min, performing secondary cooling treatment at-100 to-120 ℃ for 20-40 min, and performing tertiary cooling treatment at-150 to-220 ℃ for 10-30 min. Preferably, the temperatures of the three cold treatments are respectively as follows: the primary cooling treatment is carried out at-30 to-40 ℃, the secondary cooling treatment is carried out at-110 +/-5 ℃, and the third cooling treatment is carried out at-180 to-200 ℃.
And seventhly, rapidly heating the titanium plate blank in the sixth step to the normal temperature at the speed of 20 ℃/min.
And step eight, placing the titanium plate blank in an electrolytic cell under the vacuum condition, and carrying out electrolytic oxidation treatment to generate an oxide film on the surface of the titanium plate blank. At normal temperature, the oxide film attached to the surface of the titanium plate blank can prevent the interior of the titanium plate blank from being corroded, thereby improving the corrosion resistance of the titanium plate blank, prolonging the service life of the titanium plate blank and improving the appearance of the titanium plate blank,
the above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The heat treatment process of the titanium plate blank is characterized by comprising the following steps of:
the method comprises the following steps of firstly, preprocessing, namely, polishing by using abrasive paper to remove oxide skin and nicks, and cleaning the surface of a titanium plate blank by using alcohol;
step two, placing the titanium plate blank in an annealing furnace filled with inert gas, and heating for one time in an arithmetic progression mode under normal pressure to raise the temperature in the annealing furnace to 450 +/-10 ℃; introducing inert gas into the annealing furnace until the pressure in the annealing furnace reaches 100-120 mbar, and keeping the temperature at 450 +/-10 ℃ for 60-80 min;
thirdly, carrying out secondary heating in an arithmetic progression mode to raise the temperature in the annealing furnace to 690-700 ℃;
step four, preserving the heat for 120-180 min at 690-700 ℃ in an annealing furnace under the pressure of 100-120 mbar;
step five, after the heat preservation in the step five is finished, reducing the pressure in the annealing furnace to a normal pressure state, and reducing the pressure to a room temperature state at a speed of 10 ℃/min;
step six, performing cooling treatment by using liquid nitrogen, wherein the cooling treatment comprises performing primary cooling treatment at-20 to-50 ℃ for 30-50 min, performing secondary cooling treatment at-100 to-120 ℃ for 20-40 min, and performing tertiary cooling treatment at-150 to-220 ℃ for 10-30 min;
and seventhly, rapidly heating the titanium plate blank in the sixth step to the normal temperature at the speed of 20 ℃/min.
2. The process for heat treatment of a titanium plate blank as set forth in claim 1, wherein in the second step, the equation of the arithmetic progression is anAnd n is an integer of =25+ (n-1) × 5 ℃/min.
3. The heat treatment process of the titanium plate blank as claimed in claim 1, wherein in the third step, the equation of the arithmetic progression is as follows: a isk=450+ (n-1) × 10 ℃/min, k being an integer.
4. The heat treatment process of the titanium plate blank as claimed in claim 1, wherein in the sixth step, the temperatures of the three times of cold treatment are respectively as follows: the primary cooling treatment is carried out at-30 to-40 ℃, the secondary cooling treatment is carried out at-110 +/-5 ℃, and the third cooling treatment is carried out at-180 to-200 ℃.
5. The heat treatment process of the titanium plate blank according to claim 1, wherein in the fifth step, the cooling mode of the titanium plate blank from 690-700 ℃ to the normal temperature comprises air cooling, water cooling and liquid nitrogen.
6. The heat treatment process of the titanium plate blank as claimed in claim 5, wherein the temperature of the titanium plate blank is reduced from 690-700 ℃ to 450 ± 10 ℃ by air cooling, reduced to 250 ± 10 ℃ by water cooling at 450 ± 10 ℃, and finally cooled to normal temperature by liquid nitrogen.
7. The heat treatment process of a titanium plate blank according to any one of claims 1 to 6, further comprising a step eight of placing the titanium plate blank in an electrolytic cell under a vacuum condition to perform electrolytic oxidation treatment to form an oxide film on the surface of the titanium plate blank.
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