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ω-phase transformation-induced strengthening and toughening metastable β-type titanium alloy, pipe and manufacturing method

A technology of strengthening and toughening and phase change induction, which is applied in the direction of manufacturing tools, pipes, rigid pipes, etc., can solve the problems of easy generation of toxic hexavalent Cr ions, etc., and achieve improved plastic deformation ability, good corrosion resistance, and high yield Effect

Active Publication Date: 2022-03-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Cr and Fe are added in the form of aluminum-chromium master alloy and aluminum-iron master alloy respectively, but it contains heavy metal element Cr, and it is easy to generate toxic hexavalent Cr ions during the preparation process.

Method used

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  • ω-phase transformation-induced strengthening and toughening metastable β-type titanium alloy, pipe and manufacturing method
  • ω-phase transformation-induced strengthening and toughening metastable β-type titanium alloy, pipe and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Ingredients: according to the composition of Ti-15.0wt%W alloy, prepare zero-grade sponge Ti and Ti-31.0wt%W master alloy respectively; the purity of the metal is ≥99.99%;

[0037] 2. Melting: Vacuum suspension casting method is adopted. During smelting, control the vacuum degree in the furnace to ≤10 -2 Pa, the furnace temperature is 1600 ° C, and the alloy ingot is obtained; after sufficient cooling, the ingot is peeled to remove the oxide layer on the surface;

[0038] 3. Annealing treatment: Annealing treatment in a box-type resistance furnace, the annealing temperature is 900°C, the holding time is 1h, and air cooling;

[0039] 4. Extrusion treatment: extrusion temperature: 900°C, extrusion ratio 22, extrusion speed 80mm / s;

[0040] 5. Solution aging treatment: the solution temperature is 900°C and the time is 1h; the aging temperature is 300°C and the time is 1h.

[0041] 6. The straightening deformation of the pipe is 3%, and the final product is finished. ...

Embodiment 2

[0043] 1. Ingredients: according to the composition of Ti-18.0wt%W alloy, prepare zero-grade sponge Ti and Ti-31.0wt%W master alloy respectively; the purity of the metal is ≥99.99%;

[0044] 2. Melting: Vacuum suspension casting method is adopted. During smelting, control the vacuum degree in the furnace to ≤10 -2 Pa, the furnace temperature is 1600 ° C, and the alloy ingot is obtained; after sufficient cooling, the ingot is peeled to remove the oxide layer on the surface;

[0045] 3. Annealing treatment: Annealing treatment in a box-type resistance furnace, the annealing temperature is 920°C, the holding time is 1.5h, and air cooling;

[0046] 4. Extrusion treatment: extrusion temperature: 940°C, extrusion ratio 24, extrusion speed 70mm / s;

[0047]5. Solution aging treatment: solution temperature is 930°C, time is 1h; aging temperature is 325°C, time is 1.5h;

[0048] 6. The straightening deformation of the pipe is 3%, and the final product is finished.

Embodiment 3

[0050] 1. Ingredients: according to the composition of Ti-21.0wt%W alloy, prepare zero-grade sponge Ti; Ti-31.0wt%W master alloy; the purity of the metal is ≥99.99%;

[0051] 2. Melting: Vacuum suspension casting method is adopted. During smelting, the vacuum degree in the furnace is controlled to be ≤10-2Pa, and the furnace temperature is 1600°C to obtain alloy ingots. After fully cooling, peel the ingot to remove the oxide layer on the surface;

[0052] 3. Annealing treatment: Annealing treatment is carried out in a box-type resistance furnace, the annealing temperature is 950 ° C, the holding time is 2 hours, and air cooling;

[0053] 4. Extrusion treatment: extrusion temperature: 950°C, extrusion ratio 26, extrusion speed 60mm / s;

[0054] 5. Solution aging treatment: solution temperature is 950°C, time is 1h; aging temperature is 350°C, time is 2h;

[0055] 6. The straightening deformation of the pipe is 3%, and the final product is finished.

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Abstract

The invention discloses an ω-phase transformation-induced strengthening and toughening metastable beta-type titanium alloy, a pipe material and a manufacturing method. The remainder is titanium and unavoidable impurities. The titanium alloy of the invention has low cost, simple production process of the titanium alloy pipe, good processing performance, significantly improved yield of the pipe, and simultaneously takes into account the strength and plastic toughness.

Description

technical field [0001] The invention belongs to the technical field of manufacturing titanium alloys and pipes thereof, and in particular relates to enhanced and toughened metastable β-type titanium alloys induced by ω phase transformation, pipes and manufacturing methods. Background technique [0002] As the difficulty of oil drilling and development increases, the number of deep wells, ultra-deep wells and horizontal wells continues to increase. Traditional steel drill pipes have low specific strength, and are prone to failure accidents such as stress corrosion fatigue fractures under complex oil and gas drilling conditions. Titanium alloy drill pipe has high specific strength, good hydrogen sulfide stress corrosion resistance and corrosion fatigue resistance, which can significantly reduce the weight of the drill string, relieve stress concentration, improve the maximum drilling depth of the drill string, corrosion fatigue resistance, etc., and extend the drill string Se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22C14/00C22C1/03C22F1/183C21D9/08F16L9/02
Inventor 蒋龙冯春韩礼红刘永刚
Owner BC P INC CHINA NAT PETROLEUM CORP
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