Titanium- alloy rods producing method

FIELD: plastic working of metals, namely processes for manufacturing rods of titanium alloys used, for example for manufacturing fastening parts.

SUBSTANCE: method comprises steps of hot rolling billet formed of ingot; etching formed rod, subjecting it to vacuum annealing, daring, subjecting drawn rod to air annealing for two stages and mechanically working for final size. In first variant of invention air annealing is performed at first at temperature 650 - 750°C for 15 - 60 min at cooling in air till 20°C and then at temperature 180 -280°C for 4 - 12 h at cooling in air till 20°C. According to second variant of invention air annealing is realized at first at temperature 750 - 850°C for 15 - 45 min at cooling in furnace till 500 - 550°C and then cooling in air till 20 °C.

EFFECT: homogenous structure along rod section, increased rupture limit strength and percentage elongation, lowered labor- and power consumption.

2 cl, 1 tbl, 2 ex

 

The present invention relates to the field of metal forming and can be used to produce rods of titanium alloys, including for the production of these fasteners.

A method of obtaining rods made of titanium alloys, including heat, drawing, machining (Alexandrov VK, Anoshkin NF, Belozerov A.P. and other Semi-finished titanium alloys. - M.:VILS,1996, str-275).

The disadvantage of this method is labor - intensive operation of vacuum annealing, a fixed low level of received complex of mechanical properties, resulting in a short service life of finished products.

Also known is a method of obtaining bars, including the production of billets, her hot rolling on the rod (EN 2165808 C1, 27.04.2001, WV 1/16), the prototype.

The disadvantage of this method is the instability of the resulting mechanical properties, low tensile strength, high labor and energy consumption.

We propose a method of receiving rods of titanium alloy, including the production of billets, her hot pumping on the rod, characterized in that the workpiece is obtained from the ingot and carry out the etching of the resulting hot-rolled rod, the vacuum annealing, drawing, annealing past the drawing rod and the mechanical is th processing at the final size, in doing so, the air annealing of the last drawing of the rod in two stages: first at a temperature of 650-750°C for 15-60 minutes with cooling to room temperature, then at a temperature of 180-280°C for 4-12 hours with cooling to room temperature, machining to final size.

We propose a method of receiving rods of titanium alloy, including the production of billets, her hot rolling on the rod, characterized in that the workpiece is obtained from the ingot and carry out the etching of the resulting hot-rolled rod, the vacuum annealing, drawing, annealing past the drawing rod and machining to final size, while they conduct air annealing of the last drawing of the rod in two stages: first at a temperature of 750-850°C for 15-45 minutes with cooling in furnace down to 500-550°and then in air to room temperature, then at the temperature of 400-500°C for 4-12 hours with cooling to room temperature, machining to final size.

The proposed method of producing rods of titanium alloys differs from the prototype in that the air annealing of the last drawing of the rod are in two stages: first at a temperature of 650-750°C for 15-60 minutes with cooling PA air to room the temperature, then at a temperature of 180-280°C for 4-12 hours with cooling in air to room temperature.

The proposed method of producing rods of titanium alloys differs from the prototype in that the air annealing of the last drawing of the rod are in two stages: first at a temperature of 750-850°C for 15-45 minutes with cooling in furnace down to 500-550°and then in air to room temperature, then at a temperature of 400-500°C for 4-12 hours with cooling in air to room temperature.

The technical result is the uniformity of the structure in the cross section of the rod, the higher values of tensile strength and relative elongation, reduction of power consumption and the complexity of the process.

The proposed method allows to reduce the grain size and improve the uniformity of the structure in the cross section of the rod due to occurring more deeply during this annealing phase transformations, and in this regard, structural transformations.

Example 1. Received an ingot of the titanium alloy W 16 with a diameter of 360 mm, was heated to a temperature of 1100°gas furnace and forged a diameter of 130 mm, the resulting ground on a billet, heated to a temperature of 950°and rolled on the mill "250" in the Bay on the diameter of 10.0 mm, the Etching of the rolled workpiece held in the bays alkaline-acid method: the Christmas bath (NaOH+KOH), Tahr.=430-440°C, the etching time is 45 minutes; remove alkali produced in the acid, H2SO4Tahr.=70°S, the exposure time is 25 minutes; then rinse in water. Next, annealing was performed in vacuum at a temperature of 780°, 2 hours with cooling. Drawing annealed titanium rod produced by the chain mill "Miyazaki" without heat from Bay to Bay on the diameter of 9.5 mm, Then was carried out by etching the alkali-acid method, as described above, and conducted air annealing of the electric resistance furnace at a temperature of 720°C for 30 minutes with cooling to room temperature, then held heat treatment regime: heating to a temperature of 200°C, holding for 10 hours, cooling in air to room temperature. The resulting rod was on the ground on a centerless-off line "Kalou" on the final size of the rod 8.5 mm with simultaneous cutting and editing in moderation. Mechanical properties of bars defined by static tests are presented in table (experiment 1). Got the rods for use in the aerospace industry.

Example 2. Received an ingot of the titanium alloy W 16 with a diameter of 360 mm, was heated to a temperature of 1100°gas furnace and forged a diameter of 130 mm, the resulting ground on a billet, heated to a temperature of 950°and rolled on the mill "250" in the Bay on the diameter of 10.0 mm The etching of the rolled workpiece held in the bays alkaline-acid method: alkaline bath (NaOH+KOH), TAGR.=430-440°C, the etching time is 45 minutes; remove alkali produced in the acid, H2SO4Tahr.=70°S, the exposure time is 25 minutes; then rinse in water. Next, annealing was performed in vacuum at a temperature of 780°, 2 hours with cooling. Drawing annealed titanium rod produced by the chain mill "Miyazaki" without heat from Bay to Bay on the diameter of 9.5 mm, Then was carried out by etching the alkali-acid method, as described above, and conducted air annealing of the electric resistance furnace at a temperature of 830°C for 20 minutes with cooling in the furnace to 550°and then in air to room temperature, then held heat treatment regime: heating to a temperature of 400°C, holding for 4 hours, cooling in air. The resulting rod was on the ground on a centerless-off line "Kalou" on the final size of the rod 8.5 mm with simultaneous cutting and editing in moderation.

Mechanical properties of bars defined by static tests are presented in table (experiment 2).

The mechanical properties of the rod at a temperature of 20°C.
No. of experimentthe manual manufacturing σIn, MPaσof 0.2, MPaδ, %ψ, %The shear resistance, kgf/mm2
1The placeholder840-97088146063
2Experiment 11000-115091-100≥20≥7166-68
3Experiment 2980-99590≥18≥7269-70

Got the rods for use in the automotive industry, which on the metal specific mechanical properties.

Thus, the proposed method of producing rods of titanium alloys allows semi-stable high level of strength and plastic characteristics, which in turn influences the increase of service life (durability) of products produced in the future of the semi-finished product used in the aerospace and automotive industries.

1. The way to obtain rods of titanium alloy, including the production of billets, her hot rolling on the rod, characterized in that the workpiece is obtained from the ingot is carried out etching the resulting hot-rolled rod, the vacuum annealing, drawing, annealing past the drawing rod and machining to final size, while they conduct air annealing of the last drawing of the rod in two stages: first at a temperature of 650-750°C for 15-60 min with cooling to room temperature, then at a temperature of 180-280°C for 4-12 h with cooling to room temperature.

2. The way to obtain rods of titanium alloy, including the production of billets, her hot rolling on the rod, characterized in that the workpiece is obtained from the ingot and carry out the etching of the resulting hot-rolled rod, the vacuum annealing, drawing, annealing past the drawing rod and machining to final size, while they conduct air annealing of the last drawing of the rod in two stages: first at a temperature of 750-850°C for 15-45 minutes with cooling in furnace down to 500-550°and then in air to room temperature, then at a temperature of 400-500°C for 4-12 h with cooling to room temperature.



 

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1 tbl

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1 dwg, 1 tbl

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2 cl, 1 tbl, 2 ex

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