A method for refining β grains of tc18 titanium alloy by step strain rate forging process

A strain rate, TC18 technology, applied in the field of forging, can solve problems such as multi-pass and large deformation, and achieve the effects of increasing strain rate, promoting nucleation, and strengthening pinning

Active Publication Date: 2022-06-24
CENT SOUTH UNIV
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is just to provide a kind of method that adopts the forging process of stepped strain rate to refine TC18 titanium alloy β grain, this method can effectively refine TC18 titanium alloy β grain with relatively small amount of deformation, solves the problem Existing methods for refining β grains of TC18 titanium alloy require multiple passes or repeated large deformations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for refining β grains of tc18 titanium alloy by step strain rate forging process
  • A method for refining β grains of tc18 titanium alloy by step strain rate forging process
  • A method for refining β grains of tc18 titanium alloy by step strain rate forging process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Step 1: The TC18 titanium alloy forging billet whose initial structure is a dual-state structure is heated to the forging temperature of the α+β dual-phase region, and after the temperature of the forging billet is kept uniform, step strain rate forging is performed. The forging temperature is 730 ° C. The strain rate consists of two stages: the first stage has a strain rate of 0.1s -1 , the strain rate of the second stage is 1s -1 , the deformation of the first stage is 20% of the height of the blank (true strain 0.3), the deformation of the second stage is 40% of the height of the blank (true strain 0.62), and the total deformation of the two stages is 60% (true strain 0.92) , the strain rate changes immediately after the first stage of deformation, without interval holding time;

[0021] In step 1, the forging process flow of TC18 titanium alloy forging blank is as follows: figure 2 As shown in (a): the forging billet is first heated to 730 °C at a heating rate of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for refining β grains of TC18 titanium alloy by adopting step strain rate forging process. The method comprises the following steps: (1) heating the TC18 titanium alloy forging billet whose initial structure is a two-state structure to the forging temperature in the α+β dual-phase region, and keeping it warm until the temperature of the forging billet is uniform, and then performing two-stage step strain rate forging, The forging temperature is 700-820°C, the strain rate includes two stages, and the strain rate in the first stage is 0.1-0.5s ‑1 , the strain rate in the second stage is 1~5s ‑1 , the amount of deformation in the first stage is 20-40% of the height of the blank, the amount of deformation in the second stage is 30-50% of the height of the blank, the total deformation of the two stages is 50%-70%, and the strain after the deformation in the first stage is The rate changes immediately, without interval holding time; (2) After forging, immediately quench the forging. The invention can achieve the purpose of refining the beta grains of the TC18 titanium alloy with a relatively small amount of deformation.

Description

technical field [0001] The invention belongs to the technical field of forging, and relates to a method for refining beta grains of TC18 titanium alloy by adopting a step-strain rate forging process. Background technique [0002] TC18 titanium alloy is a near-beta titanium alloy, which combines the performance characteristics of α+β titanium alloy and β titanium alloy. It not only has excellent toughness, strength, damage tolerance, corrosion resistance and fatigue resistance, but also has good performance. The hardenability and other advantages. At present, near-beta titanium alloys are widely used in the production of aircraft landing gear, chassis, wings and other aviation parts. [0003] The properties of TC18 titanium alloy are closely related to its internal microstructure. Titanium alloys with dual-mode structure have better comprehensive properties and are generally obtained by forging in the α+β phase region. An important goal of forging in the α+β phase region is...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 何道广蔺永诚粟港
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap