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As-cast Ti6321 titanium alloy for ships and warships and preparation method thereof

A technology of ti6321 and titanium alloy, which is applied in the field of cast Ti6321 titanium alloy for ships and its preparation, to meet the material requirements and optimize the heat treatment process

Active Publication Date: 2020-07-28
LUOYANG SUNRUI TI PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of as-cast Ti6321 titanium alloy for ships and its preparation method, through composition optimization and heat treatment process, optimize and solve the problem of the best matching of impact toughness and high temperature creep strength in as-cast Ti6321 titanium alloy

Method used

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  • As-cast Ti6321 titanium alloy for ships and warships and preparation method thereof
  • As-cast Ti6321 titanium alloy for ships and warships and preparation method thereof
  • As-cast Ti6321 titanium alloy for ships and warships and preparation method thereof

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preparation example Construction

[0023] A preparation method of cast Ti6321 titanium alloy for ships, comprising the steps of:

[0024] Step 1: Use modified Ti6321 titanium alloy and other raw materials to smelt as-cast Ti6321 alloy ingots with a Si element content of 0.13%~0.17%. After smelting, the other elements of the ingot are 6.2% Al, 3.0% Nb, 2.5% Zr and 1.0% Mo, the balance being Ti;

[0025] Step 2, casting the cast Ti6321 alloy ingot obtained in step 1 into castings and test bars, and then performing hot isostatic pressing and stress relief annealing on the cast castings and test bars;

[0026] Step 3: send the castings and test rods treated in step 2 into a vacuum solid melting furnace and heat them to 1015°C, then keep them warm for 1.5h, and then carry out argon-filled cooling. The cooling rate is controlled between 35°C / min and 45°C / min. When the temperature is lower than 200°C, it is ventilated and cooled, and then it is released when the temperature is lower than 40°C to obtain the desired pr...

Embodiment

[0035] Embodiment: The present embodiment is the application of the cast Ti6321 titanium alloy for ships prepared by the method of the present invention, and the prepared titanium alloy material is cast into valve bodies, valve seats and valve covers for ships, and 40 Test rod, the size of the test rod is Φ15×120mm, the quantity and size of the valve body, valve seat and valve cover are shown in Table 3.

[0036]

[0037] The Si element content in the as-cast Ti6321 titanium alloy prepared in this example is 0.14%, and then it is casted in a vacuum shell-condensing furnace, and the casting mold is a machined graphite type to obtain the above-mentioned valve body, valve seat, valve cover and test rod , and then, after hot isostatic pressing treatment (910℃~930℃, heat preservation for 2 hours, cool to below 300℃ with the furnace), and then perform stress relief annealing (580℃, heat preservation for 1h, cool with the furnace to below 100℃ and release from the furnace) , follo...

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Abstract

The invention relates to as-cast Ti6321 titanium alloy for ships and warships and a preparation method thereof. The method comprises the following steps of smelting an as-cast Ti6321 alloy ingot withthe Si element content of 0.13%-0.17% by using deformation Ti6321 titanium alloy and other raw material, and casting into a casting or a test bar, and carrying out hot isostatic pressing treatment andstress relief annealing, and then carrying out solution heat treatment to obtain the required product. The as-cast Ti6321 titanium alloy prepared by the method provided by the invention can reach themechanical properties required by high-temperature structural parts for ships and warships. According to the method, the problem that the cast Ti6321 alloy is applied to the high-temperature structural part on the ship and warships is successfully solved, the casting product with the room-temperature performance and the high-temperature performance meeting the use requirements is obtained, and anew scheme is provided for application of titanium alloy materials in the field of ships and warships.

Description

technical field [0001] The invention belongs to the field of titanium alloy casting, in particular to a cast Ti6321 titanium alloy for ships and a preparation method thereof. Background technique [0002] Ti6321 belongs to near α-type titanium alloy, and its nominal composition is Ti-6Al-3Nb-2Zr-1Mo. Because Ti6321 has high specific strength, good corrosion resistance, excellent welding performance and good fatigue resistance, it can be applied in chemical corrosion environment Structural parts such as the pump body and valve body can also be applied to pressure vessels, force-bearing structural parts for ships and other fields. In recent years, with the diversification of titanium alloys for ships, cast Ti6321 titanium alloys have also been applied to ships. The high temperature structural part of the ship. [0003] After hot isostatic pressing treatment and stress relief annealing treatment, the mechanical properties of castings cast by conventional as-cast Ti6321 titaniu...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/03C22F1/02C22F1/18
CPCC22C1/03C22C14/00C22F1/02C22F1/183
Inventor 孙宏喆陈令杰贾国成常化强刘茵琪
Owner LUOYANG SUNRUI TI PRECISION CASTING
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