TWI717007B - Titanium alloy plate and manufacturing method thereof - Google Patents

Abstract

A titanium alloy sheet, calculated based on its total weight as 100wt%, the titanium alloy sheet comprising the following ingredients: 5-7wt% aluminum, 3-5wt% vanadium, 0.04-0.13wt% gamma, 0.2wt% or less iron , 0.03wt% or less nitrogen, 0.015wt% or less hydrogen, 0.2wt% or less oxygen, 0.05wt% or less carbon, balance titanium, and unavoidable impurities. The aluminum alloy material of the present invention is added with gamma (Gd) and combined with a rolling method to produce a new type of aluminum alloy sheet with higher strength and ductility.

Description

Titanium alloy plate and manufacturing method thereof

The present invention relates to a titanium alloy sheet and a manufacturing method thereof, and in particular to a titanium alloy sheet having better strength and ductility and a manufacturing method thereof.

Golf club heads need to have strong strength and toughness, because the club heads often hit the golf ball with extremely high swing speeds, and based on performance considerations, the lighter the club head shell is, the better. Because of the heavy space, the thickness of the striking surface is usually between 2~4mm, which further deepens the test of material performance, so the conditions for the selection of materials for the head are usually extremely harsh.

The applicant’s previous patent document (TW application number: 108116204) proposes a titanium alloy rolled plate for golf club heads, which is made with a special construction method and special alloy to produce high corrosion resistance, high tensile and yield strength, and high toughness For titanium alloy plates with other characteristics, the specification can be incorporated herein as a reference (Incorporated by Reference). However, due to industry competition and the demand for continuous innovation, the pursuit of higher strength and better materials is the direction of the company's efforts. Therefore, there is a need to provide a titanium alloy sheet and its manufacturing method with higher performance and quality in terms of strength and ductility.

One purpose of the present invention is to provide a titanium alloy sheet with better strength and ductility and a method for manufacturing the same.

According to the above-mentioned purpose, the present invention provides a titanium alloy sheet, calculated based on its total weight as 100wt%, the titanium alloy sheet includes the following ingredients: 5-7wt% aluminum, 3-5wt% vanadium, 0.04~0.13wt% Gamma, 0.2% wt or less iron, 0.03 wt% or less nitrogen, 0.015 wt% or less hydrogen, 0.2 wt% or less oxygen, 0.05 wt% or less Carbon, balance of titanium, and unavoidable impurities.

The present invention further provides a titanium alloy sheet manufacturing method, which includes the following steps: performing a smelting process on each material containing titanium, aluminum, aluminum, vanadium, and gamma to form an ingot; performing a forging process on the ingot. process) to form a slab: and perform a rolling process on the slab to form a titanium alloy sheet, wherein the rolling process includes: performing a first heat treatment step: at a heating temperature of 1000±100°C In the meantime, the blank is rolled to reduce the original thickness of the blank to the first thickness; a second heat treatment step is performed: at a heating temperature of 750±50°C, the plate after the first heat treatment step The blank is rolled to reduce the first thickness of the blank to the second thickness; a third heat treatment step is performed: the blank after the second heat treatment step is water quenched at a heating temperature of 1000±100°C; And performing a fourth heat treatment step: at a heating temperature of 750±50°C, the blank after the third heat treatment step is reversed rolled to reduce the second thickness of the blank to the third thickness; wherein The titanium alloy sheet includes the following ingredients: 5~7wt% aluminum, 3~5wt% vanadium, 0.04~0.13wt% gamma, 0.2%wt or less iron, 0.03wt% or less nitrogen, 0.015wt% or less hydrogen, 0.2wt% or less oxygen, 0.05wt% or less carbon, balance titanium, and unavoidable impurities.

The aluminum alloy material of the present invention is added with gamma (Gd) and combined with a rolling method to produce a new type of aluminum alloy sheet with higher strength and ductility. Compared with the commonly used aluminum alloy (Ti-6Al-4V) in the industry, the titanium alloy sheet of the present invention has better strength and ductility.

S100‧‧‧Step

S200‧‧‧Step

S210‧‧‧First forging step

S220‧‧‧Second forging step

S230‧‧‧The third forging step

S240‧‧‧Fourth forging step

S250‧‧‧Fifth forging step

S300‧‧‧Step

S310‧‧‧The first heat treatment step

S320‧‧‧Second heat treatment step

S330‧‧‧The third heat treatment step

S340‧‧‧The fourth heat treatment step

Fig. 1 is a schematic flow chart of a method for manufacturing a titanium alloy sheet according to an embodiment of the present invention.

Figure 2 is a schematic diagram of the forging process of the present invention.

Figure 3 is a schematic flow diagram of the rolling process of the present invention.

Figure 4 is a metallographic image (optical microscope-1000 times) of aluminum alloy (Ti-6Al-4V) commonly used in the industry.

Figure 5 is a metallographic diagram of the titanium alloy material of the present invention (optical microscope-1000 times).

In order to make the above-mentioned objectives, features and characteristics of the present invention more obvious and understandable, the relevant embodiments of the present invention are described in detail below in conjunction with the drawings.

Fig. 1 is a schematic flow chart of a method for manufacturing a titanium alloy sheet according to an embodiment of the present invention. The method for manufacturing a titanium alloy sheet includes the following steps: in step S100, a smelting process is performed on each material containing titanium, aluminum, vanadium, and gamma to form an ingot. In this embodiment, the smelting process may use sponge titanium, titanium aluminum alloy, aluminum-vanadium alloy, and gamma oxide for vacuum arc consumable smelting. In another embodiment, the smelting process can also use pure titanium, pure aluminum, pure vanadium, and pure gamma to perform vacuum arc consumable smelting. The vacuum consumable arc refers to the use of a DC power supply to generate an arc between the electrode and the bottom plate placed on the copper crucible. The arc generates high heat to melt the electrode. The electrode continues to drop and melt, forming a molten pool in the water-cooled copper crucible, and the molten metal is quickly solidified. , Crystallization and ingot formation.

For example, the smelting process uses sponge titanium, titanium aluminum alloy, aluminum vanadium alloy, and gamma oxide as raw materials to configure alloy materials. After each composition is proportioned according to the designed mass ratio, it is smelted in a vacuum consumable smelting furnace. The number of smelting is 3 times. The ingot diameter is 120mm, the secondary ingot diameter is 170mm, and the tertiary ingot diameter is 220mm. The ingot production process is as follows: sponge titanium → material picking → material mixing → cloth → pressing electrode → electrode assembly welding → melting → ingot processing, analysis and inspection → storage. According to the determined process route, alloying method and the developed trial production plan, an ingot with a diameter of Φ 220mm is smelted. After the surface contamination layer and subcutaneous pore defects are removed from the ingot, the chemical composition and gas analysis samples are taken at a position 50 mm from the riser and bottom of the ingot. Using standard methods, the component detection was completed, and the results are shown in Table 1. It can be seen that all the main elements and impurity elements in the ingot meet the trial production requirements, and the composition control has reached the expected goal.

In step S200, a forging process is performed on the ingot to form a blank. For example, the forging equipment used is an 800-ton fast forging machine, and the temperature control accuracy of the heating furnace is ±10°C. Figure 2 is a schematic diagram of the forging process of the present invention. The forging process includes: performing a first forging step S210, billeting: upsetting and drawing the ingot at a heating temperature of 1180±20°C, air cooling after forging, and grinding to remove surface cracks and cracks. Part of the oxide scale to form a blank; a second forging step S220 is performed, and the blank is forged: at a heating temperature of 980±10°C, the blank after the first forging step S210 is subjected to an upsetting and stretching, and forging After air cooling, and grinding to remove surface cracks and partial oxide scales; perform a third forging step S230, the blank is forged: at a heating temperature of 960±10°C, the blank after the second forging step S220 is subjected to an upsetting Rough-stretching, air cooling after forging, and grinding to remove surface cracks and partial oxide scale; a fourth forging step S240 is performed, and the blank is forged: at a heating temperature of 940±10°C, the third forging step S230 The next billet is subjected to an upsetting and drawing length, and is returned to the furnace after forging; and a fifth forging step S250 is performed, at a heating temperature of 820±40°C, the billet after the fourth forging step S240 is unidirectionally pressed It is operated alternately with round shaping, and forged into a slab with a size of 400mmx300mmx60mm.

In step S300, a rolling process is performed on the blank to form a titanium alloy plate. For example, a small rolling mill with a roll width of 400mm is used to complete sheet rolling. The slab is heated by a high-temperature box-type resistance furnace and rolled on the rolling mill of the hot rolling test unit. Use a digital potentiometer to calibrate the temperature of the box-type resistance furnace to ensure a temperature deviation of ±10°C.

Figure 3 is a schematic flow diagram of the rolling process of the present invention. In this embodiment, the rolling process includes: performing a first heat treatment step S310: rolling the plate blank at a heating temperature of 1000±100°C to reduce the original thickness of the plate blank to the first thickness , For example, δ60mm→δ30mm; perform a second heat treatment step S320: between the heating temperature of 750±50°C, the blank after the first heat treatment step S310 is rolled to reduce the first thickness of the blank to the first Two thickness, for example δ30mm→δ15mm; perform a third heat treatment step S330: perform water quenching of the blank after the second heat treatment step S320 at a heating temperature of 1000±100°C, for example, water quenching for 30 minutes; and perform a The fourth heat treatment step S340: between the heating temperature of 750±50°C, the blank after the third heat treatment step S330 is reversing rolling to reduce the second thickness of the blank to the third thickness, for example δ15mm→ δ4±0.6mm. With the new composition ratio of the titanium alloy, the new rolling process of the present invention can further enhance the titanium alloy sheet to have better strength and ductility.

The titanium alloy sheet includes the following components: 5~7wt% aluminum, 3~5wt% vanadium, 0.04~0.13wt% gamma, 0.2% or less iron, 0.03wt% or less nitrogen, 0.015wt% or less hydrogen, Oxygen below 0.2wt%, carbon below 0.05wt%, balance titanium, and unavoidable impurities are shown in Table 2. In the present invention, a new type of titanium alloy material with higher strength is manufactured by adding a rare earth element: gamma (Gd), and the combination of a rolling method (ie, a rolling method).

The invention adds a small amount of rare earth element gamma (Gd), and uses a special rolling method to make the crystal grains directional, thereby greatly increasing the strength of the material in a specific direction, and using appropriate annealing methods to reduce the material due to the rolling method Recovery of elongation, and obtain high strength and high ductility titanium alloy material. Figure 4 is commonly used in the industry The metallographic diagram of the titanium alloy (Ti-6Al-4V). Figure 5 is the metallographic diagram of the titanium alloy material of the present invention. Figure 5 shows that the addition of a small amount of gamma (Gd) will refine the grains, so in the subsequent hot pressing Rolling or heat treatment can obtain finer grains, which is also the key to improving strength.

The gamma (Gd) element is easy to deposit at the grain boundaries of titanium alloy materials, and the gamma (Gd) at the grain boundaries during the hot rolling and heat treatment of titanium alloy materials will restrict and hinder the growth of grains, making the treated titanium The alloy can ultimately retain finer grains, thereby improving the physical properties and quality of titanium alloy materials. The addition of gamma (Gd) element can also suppress the crack extension caused by the corners of titanium alloy materials during rolling, improve the poor material yield of titanium alloys (Ti-6Al-4V) commonly used in the industry, and make the plate easier to roll. Under the circumstances, the yield rate of titanium alloy (Ti-6Al-4V) is not high, only about 60% to 70%, and the yield rate can be increased to 80% when a trace amount of gamma (Gd) is added.

The α/β conversion temperature of the titanium alloy material of the present invention is about 950°C to 990°C, and the starting temperature (Ms) for the conversion of scattered iron in Matian is between 800°C and 840°C. Below the scattered iron conversion temperature (Ms), about 700℃~800℃, because the temperature is below the starting temperature (Ms) of the Asada scattered iron conversion, a large number of strengthening phases are easily precipitated in the internal grains of the titanium alloy material. The precipitation makes the strength of the titanium alloy sheet increase.

Taking the titanium alloy composition ratio of Example 1 in Table 1 as an example, 5 transverse (L) and longitudinal (T) tensile samples were sampled on a plate of about 4.5 mm, and the tensile test was carried out at room temperature. The test results See Table 3. It can be seen that the T-direction has much higher mechanical properties than the commonly used titanium alloy (Ti-6Al-4V) in the industry. When the golf head makes the striking panel, the performance will be affected according to the cutting direction. Cutting the panel in the T direction can ensure the ball head Have the best mechanical properties.

The titanium alloy material of the present invention is added with gamma (Gd) and combined with a rolling method to produce a new type of titanium alloy sheet with higher strength and ductility. It can be seen from Table 4 that the titanium alloy sheet of the present invention has better strength and ductility than the commonly used titanium alloy (Ti-6Al-4V) in the industry.

To sum up, it only describes the preferred implementations or examples of the technical means adopted by the present invention to solve the problems, and is not used to limit the scope of implementation of the patent of the present invention. That is to say, all the equivalent changes and modifications made in accordance with the scope of the patent application of the present invention or made in accordance with the scope of the patent of the present invention are covered by the scope of the present patent.

S100‧‧‧Step

S200‧‧‧Step

S300‧‧‧Step

Claims (8)

A titanium alloy sheet, calculated based on its total weight as 100wt%, the titanium alloy sheet is composed of the following components: 5-7wt% aluminum, 3-5wt% vanadium, 0.04-0.13wt% gamma, 0.07-0.2wt % Iron, 0.006~0.03wt% nitrogen, 0.0051~0.015wt% hydrogen, 0.009~0.2wt% oxygen, 0.022~0.05wt% carbon, balance titanium, and inevitable impurities. According to the titanium alloy sheet according to item 1 of the scope of patent application, the tensile strength of the titanium alloy sheet is between 170 and 182 KSI, and the elongation of the titanium alloy sheet is between 12 and 19%. A method for manufacturing a titanium alloy sheet includes the following steps: performing a smelting process on each material containing titanium, aluminum, aluminum, vanadium, and gamma to form an ingot; performing a forging process on the ingot to form A slab, wherein the forging process includes: performing a first forging step: at a heating temperature of 1180±20°C, the ingot is upset and elongated, air-cooled after forging, and ground cracks are removed by grinding And part of the oxide scale to form a blank; perform a second forging step: at a heating temperature of 980±10°C, the blank after the first forging step is upset and elongated, and after forging, it is air cooled and repaired. Grinding to remove surface cracks and part of the oxide scale; perform a third forging step: at a heating temperature of 960±10°C, the blank after the second forging step is upset and elongated, after forging, air-cooled and repaired Grinding to remove surface cracks and partial oxide scales; performing a fourth forging step: upsetting and drawing the blank after the third forging step at a heating temperature of 940±10°C, and returning it to the furnace after forging; and A fifth forging step: at a heating temperature of 820±40°C, the blank after the fourth forging step is subjected to one-way pressing and peripheral shaping alternate operations, and forging into the slab; and A rolling process is performed on the plate blank to form a titanium alloy plate, wherein the rolling process includes: performing a first heat treatment step: rolling the plate blank at a heating temperature of 1000±100°C Rolling to reduce the original thickness of the blank to the first thickness; perform a second heat treatment step: at a heating temperature of 750±50°C, roll the blank after the first heat treatment step to make the blank The first thickness is reduced to the second thickness; a third heat treatment step is performed: the blank after the second heat treatment step is water quenched at a heating temperature of 1000±100°C; and a fourth heat treatment step is performed: The heating temperature is between 750±50℃, and the blank after the third heat treatment step is reversed rolled to reduce the second thickness of the blank to the third thickness; wherein the titanium alloy plate includes the following components: 5~ 7wt% aluminum, 3~5wt% vanadium, 0.04~0.13wt% gamma, 0.07~0.2wt% iron, 0.006~0.03wt% nitrogen, 0.0051~0.015wt% hydrogen, 0.009~0.2wt% Oxygen, 0.022~0.05wt% carbon, balance titanium, and unavoidable impurities. According to the titanium alloy sheet manufacturing method described in item 3 of the scope of patent application, the smelting process includes: using sponge titanium, titanium aluminum alloy, aluminum vanadium alloy, and gyrium oxide for vacuum arc consumable smelting. According to the titanium alloy sheet manufacturing method described in item 3 of the scope of patent application, the smelting process includes: using pure titanium, pure aluminum, pure vanadium and pure gamma to perform vacuum arc consumable smelting. According to the titanium alloy sheet manufacturing method described in item 3 of the scope of patent application, the temperature of the titanium alloy sheet is 700°C to 800°C below the Ms transition temperature. According to the titanium alloy sheet manufacturing method described in item 6 of the scope of patent application, the tensile strength of the titanium alloy sheet is between 170 and 182 KSI, and the elongation of the titanium alloy sheet is between 12 and 19%. A method for manufacturing a titanium alloy plate includes the following steps: A smelting process is performed on each material containing titanium, aluminum, aluminum, vanadium, and gamma to form an ingot; a forging process is performed on the ingot to form a blank, wherein the forging process includes: A first forging step: at a heating temperature of 1180±20°C, the ingot is subjected to one upsetting and one drawing, after forging, air cooling, and grinding to remove surface cracks and partial oxide scales to form a blank; A second forging step: at a heating temperature of 980±10°C, the blank after the first forging step is upset and elongated, air-cooled after forging, and ground cracks and some oxide scales are removed by grinding; A third forging step: at a heating temperature of 960±10°C, the blank after the second forging step is upset and elongated, air-cooled after forging, and ground cracks and partial oxide scale are removed by grinding; A fourth forging step: at a heating temperature of 940±10°C, the blank after the third forging step is upset and drawn, forged and then returned to the furnace; and a fifth forging step: at the heating temperature: 820 Within ±40°C, the blank after the fourth forging step is subjected to one-way pressing and peripheral shaping alternate operations, and forged into the slab; and the blank is formed by a rolling process A titanium alloy sheet, wherein the rolling process includes: performing a first heat treatment step: rolling the blank at a heating temperature of 1000±100°C to reduce the original thickness of the blank to the first thickness; Perform a second heat treatment step: roll the blank after the first heat treatment step at a heating temperature of 750±50°C to reduce the first thickness of the blank to the second thickness; perform a third heat treatment Step: Water quenching the blank after the second heat treatment step at a heating temperature of 1000±100°C; and Carry out a fourth heat treatment step: at a heating temperature of 750±50°C, the plate blank after the third heat treatment step is reverse-rolled to reduce the second thickness of the plate blank to the third thickness; wherein the titanium The alloy sheet consists of the following ingredients: 5~7wt% aluminum, 3~5wt% vanadium, 0.04~0.13wt% gamma, 0.07~0.2% iron, 0.006~0.03wt% nitrogen, 0.0051~0.015wt% Hydrogen, 0.009~0.2wt% oxygen, 0.022~0.05wt% carbon, balance titanium, and inevitable impurities.

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