Manufacturing method of titanium alloy with high-strength and high-formability and its titanium alloy

Patent metadata

Field	Value
Publication number	US-9435017-B2
Application number	US-201213879206-A
Country	US
Kind code	B2
Filing date	Mar 19, 2012
Priority date	Jan 11, 2012
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A method of manufacturing a titanium alloy with high strength and high formability, the method including preparing a titanium alloy material and equipment for manufacturing the titanium alloy, manufacturing the titanium alloy having a lamellar structure (martensite structure) by cooling the prepared titanium alloy material with water after performing heat treatment at the beta transformation temperature or more, and rolling that makes ultrafine grains by finishing forming of the titanium alloy at a plastic instability temperature or less of an initial lamellar structure by gradually decreasing the forming temperature in accordance with an increase of a strain after starting the forming at the plastic instability temperature or more of an initial lamellar structure, under a condition of a low strain in which the strain is 2.5 or less, after the manufacturing of a titanium alloy having a lamellar structure.

First claim

What is claimed is:

1. A method of manufacturing a titanium alloy, the method comprising:
preparing a titanium alloy material and equipment for manufacturing a titanium alloy;
manufacturing the titanium alloy having a lamellar structure by cooling the prepared titanium alloy material with water after performing heat treatment at the beta transformation temperature or more; and
rolling that makes ultrafine grains by finishing forming of the titanium alloy at a plastic instability temperature by gradually decreasing the forming temperature in accordance with an increase of a strain after starting the forming at the plastic instability temperature or more, under a condition of a low strain in which the strain is 2.5 or less, after the manufacturing of a titanium alloy having a lamellar structure.

2. The method of claim 1 , wherein, in the rolling, the initial forming start temperature for starting the forming is the plastic instability temperature or more of an initial lamellar structure, the final forming temperature for finishing the forming is the plastic instability temperature or less of an initial lamellar structure, and the process is finished while maintaining the plastic instability temperature or less of the initial lamellar structure when the strain reaches 2.5 while decreasing the temperature along a predetermined drop curve in accordance with an increase in the strain after starting the forming at a forming temperature of the plastic instability temperature or more at the initial stage.

Assignees

• Park Chan Hee
• Oh Chang Seok
• Yeom Jong Taek
• Hong Jae Keun
• Lee Chong Soo
• Hyun Yong Taek
• Korea Mach & Materials Inst

Inventors

• Park Chan Hee
• Oh Chang Seok
• Yeom Jong Taek
• Hong Jae Keun
• Lee Chong Soo
• Hyun Yong Taek

Classifications

• C22F1/183 Primary

  of titanium or alloys based thereon · CPC title

• C22C14/00

  Alloys based on titanium · CPC title

• C22F1/18 Primary

  High-melting or refractory metals or alloys based thereon · CPC title