Beta-type titanium alloy

A technology of titanium alloy and β phase transformation, applied in the field of β-type titanium alloy and its heat treatment, can solve the problem of β-type titanium alloy that has not yet been found in cold workability, and achieve the effect of excellent cold workability and excellent strength

Inactive Publication Date: 2007-08-01
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the research so far, no β-type titanium alloy with excellent cold workability and higher strength than Ti-20V-4Al-1Sn has been found, so cannot meet the stated requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11

[0035] (Examples 1-11, Comparative Examples 1-6)

[0036] According to the proportions of each element shown in Table 1, an ingot was produced by melting a button arc, hot rolled to a thickness of 4 mm, and subjected to solution treatment.

[0037] Solution treatment was performed to 500° C., cooled at an average cooling rate of 4° C. / second, and then left to cool naturally to room temperature.

[0038] Then, scale was removed and cold rolling was performed to prepare a thin plate sample of β-type titanium alloy having a thickness of 1 mm.

[0039] (evaluate)

[0040] The evaluation of each Example and a comparative example was implemented as follows.

[0041]

[0042] Thermal deformation resistance was obtained by a processing heat simulation (formaster) test using a test piece (8 mm in diameter x 12 mm in length) cut out from the ingot. Specifically, the test piece was rapidly heated to 900° C. by infrared rays, compressed at a speed of 50 mm / sec, and a compression rati...

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PUM

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Abstract

Provided is a β-type titanium alloy having excellent cold workability and higher strength than Ti-20V-4Al-1Sn β-type titanium alloy, which contains: V: 5-15%, Fe: 0.5% by weight ~2.5%, Mo: 0.5~6%, Cr: 0.5~5%, and let the weight % of V contained be XV, the weight % of Fe contained be XFe, and the weight % of Mo contained be XMo When the weight % of Cr contained is XCr, the value of XV+2.95XFe+1.5XMo+1.65XCr is 15 to 23%, Al: 1.5 to 5%, and the balance is composed of Ti and impurities.

Description

technical field [0001] The invention relates to a β-type titanium alloy and a heat treatment method thereof. Background technique [0002] Titanium alloys are light in weight and high in strength. Most of the titanium alloys composed of β-phase monomers called β-type titanium alloys have better cold workability than titanium alloys with α-phase as the main body. It is possible to make a titanium alloy with excellent strength. [0003] As the β-type titanium alloys, Ti-20V-4Al-1Sn (Patent Document 1), Ti-15V-3Cr-3Al-3Sn, Ti-22V-4Al (Patent Document 2), Ti-15V- 6Cr-4Al (Patent Document 3), Ti-13V-9Cr-3Al, Ti-15Mo-5Zr-3Al, Ti-3Al-8V-6Cr-4Mo-4Zr, Ti-13V-11Cr-3Al, Ti-4.5Fe- 6.8Mo-1.5Al etc. [0004] Among them, although Ti-15V-6Cr-4Al, Ti-13V-9Cr-3Al, Ti-15Mo-5Zr-3Al, Ti-3Al-8V-6Cr-4Mo-4Zr, and Ti-13V-11Cr-3Al have high strength, but Cold and hot deformation resistance is large, so the workability is poor and limited to special applications. [0005] On the contrary, althoug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00
Inventor 松本启
Owner NIPPON STEEL CORP
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