Process for manufacturing type alpha+beta titanium alloy rod bar for rotor impeller vane

A technology for rotor blades and manufacturing processes, which is applied in the field of manufacturing process of titanium alloy bars for rotor blades, can solve the problems of uneven structure, unfavorable overheating structure of titanium alloy, and no introduction of process parameters, so as to improve the uniformity of structure and the The yield, the method is stable and reliable, and the effect of eliminating quality defects

Inactive Publication Date: 2008-10-29
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in order to control the appearance of β spots, the traditional process controls from the perspective of deformation temperature and heat treatment. The upper limit of forging and solution treatment temperature is specified for different titanium alloys, and the temperature rise is strictly controlled. This traditional method is technically difficult and unreasonable. Stablize
my country, the former Soviet Union and the United States in the 1960s all adopted the above-mentioned process, but the structure of the titanium alloy produced by the previous process was coarse, the average grain size was about 20-30 μm, and it was not conducive to the control of the local overheating structure of the titanium alloy; later the United States In the manufacture of titanium alloys, β water quenching is used in the forging process, but no specific process parameters are introduced
Our company used the traditional titanium alloy forging process before. Since the electro-hydraulic hammer is used for forging in the two-phase area, the main disadvantage of this technology is that it is difficult to control the hammering speed and strength of the electro-hydraulic hammer, which may easily cause the temperature rise of the core, and The thermal conductivity of titanium alloy is poor and the microstructure is sensitive to the thermal processing temperature, which will cause the inhomogeneity of the structure, which is difficult to eliminate in the subsequent processing; and the low-magnification structure of the finished bar is easy to Patterns caused by thermal processing appear

Method used

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  • Process for manufacturing type alpha+beta titanium alloy rod bar for rotor impeller vane
  • Process for manufacturing type alpha+beta titanium alloy rod bar for rotor impeller vane
  • Process for manufacturing type alpha+beta titanium alloy rod bar for rotor impeller vane

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The surface of the ingot is uniformly coated with a special paint, and then the components are homogenized in a micro-oxidation atmosphere furnace. The furnace is lower than 800 °C, preheated for 30 minutes, and then the temperature is uniformly raised to 40 °C above the phase transition point at 100 °C / hour. Heat preservation for 13 hours; use fast forging machine to open the billet in the β area by pier drawing process, and then forge at 910°C to 160 octagonal, keep the 160 octagonal billet at 20°C above the phase transition point for 4 hours, and water quench immediately after coming out of the furnace , the operation time does not exceed 30 seconds; after that, the radial forging machine is used for forging, the forging temperature is 900°C, the deformation is controlled at 30-50%, the elongation coefficient of each pass is controlled at 1.2-1.3, forging to 90 square meters, and finally Rolled to a φ28mm bar on a rolling mill at a rolling temperature of 910°C, the pr...

Embodiment 2

[0030]The surface of the ingot is evenly coated with a special paint, and then the components are homogenized in a micro-oxidation atmosphere furnace. The furnace is lower than 800 °C, preheated for 30 minutes, and then the temperature is uniformly raised to 50 °C above the phase transition point at 100 °C / hour. Heat preservation for 15 hours; use fast forging machine to open the billet in the β area by pier drawing process, and then forge at 920°C to 180 octagonal, keep the 180 octagonal billet at 30°C above the phase transition point for 5 hours, and water quench immediately after coming out of the furnace , the operation time does not exceed 30 seconds; after that, the radial forging machine is used for forging, the forging temperature is 910°C, the deformation is controlled at 30-50%, the elongation coefficient of each pass is controlled at 1.2-1.3, forging to 110 square meters, and finally in Rolled to φ32mm bars on the rolling mill, the rolling temperature is 920°C, the p...

Embodiment 3

[0032] The surface of the ingot is uniformly coated with a special paint, and then the components are homogenized in a micro-oxidizing atmosphere furnace. The furnace is lower than 800 °C, preheated for 30 minutes, and then the temperature is uniformly raised to 60 °C above the phase transition point at 100 °C / hour. Heat preservation for 17 hours; use fast forging machine to open the billet in the β area by pier drawing process, and then forge at 930°C to 190 octagonal, keep the 190 octagonal billet at 40°C above the phase transition point for 6 hours, and water quench immediately after coming out of the furnace , the operation time does not exceed 30 seconds; after that, the radial forging machine is used for forging, the forging temperature is 920°C, the deformation is controlled at 30-50%, the elongation coefficient of each pass is controlled at 1.2-1.3, forging to 120 square meters, and finally in Rolled to φ36mm bars on the rolling mill, the rolling temperature is 930°C, t...

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Abstract

The invention relates to an Alpha+Beta type titanium alloy steel bar fabrication technology used on a rotor vane, which comprises the following steps: (1) a cast ingot is heated, and the temperature is risen to 40 to 60 DEG C above a Beta transformation point after entering in a furnace, and the temperature is kept for 10 to 20 hours; (2) the cast ingot is processed through cogging and smithing, each pier drawing deformation amount is controlled between 30 percent to 40 percent; the smithing is performed in a two phase region after the pier drawing, and the total deformation amount is more than or equals to 90 percent; (3) the cast ingot is heated until the temperature reaches 20 to 40 DEG C above the transformation point after returning to the furnace, the temperature is preserved, and then the water quench is performed; (4) after the water quench, stocks are returned to the furnace and heated, and then are heat-preserved in the two phase region; the two phase region smithing is performed in a radial forging machine after the stocks reach a certain temperature, and the lengthening coefficient is controlled between 1.2 to 1.3; (5) after the radial smithing, the stocks is returned to the furnace and heat continuously and then is heat-preserved in the two phase region, then the stocks is rolled on a rolling mill, and the rolling temperature ranges from 910 to 940 DEG C. The Alpha+Beta type titanium alloy steel bar fabrication technology eliminates the figures on a macrostructure and the Beta spots on a microstructure of the heat strong two-phase titanium alloy caused by the hot work, and obtains a small-size two-phase titanium alloy steel bar with a fine and uniform equiaxed two-state structure.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal material processing, and in particular relates to a manufacturing process of titanium alloy rods for rotor blades. Background technique [0002] Titanium and titanium alloys have high specific strength and excellent corrosion resistance, and the density is only about half that of steel and nickel-based superalloys. These excellent properties make titanium and titanium alloys widely and successfully used in the aviation industry and the chemical industry. With the development of the economy, the application of titanium is gradually increasing in other fields, such as construction, chemical industry, medicine, energy, deep sea and offshore applications, sports and leisure, and transportation. At present, titanium alloys are mainly used in aviation in my country. In the field of aerospace, it is mainly used in the military industry. However, with the development of the aviation military industry and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18B21J5/00B21B37/74F01D5/28
Inventor 秦桂红计波朱峰刘金生
Owner BAOSHAN IRON & STEEL CO LTD
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