Titanium Sheet with Coarse Grains and Precipitates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing techniques for producing titanium sheets with high strength and workability are inadequate in terms of cost-effectiveness and productivity, as they often require excessive alloying elements, lengthy production methods, and difficulty in controlling low Fe content, especially when recycling scrap materials.
Innovation Solution
A titanium sheet with a chemical composition of Cu: 0.1-1.0%, Ni: 0.01-0.20%, Fe: 0.01-0.10%, O: 0.01-0.10%, and Cr: 0-0.20% is developed, with an average grain size of 15 μm or larger, and intermetallic compounds of Cu and/or Ni at 2.0 volume % or less, optimized through hot working, pickling, cold working, and final annealing at specific temperature ranges to achieve a balance of strength and ductility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If alloying elements are added to refine crystal grains to increase strength, then strength is improved, but workability deteriorates
Solution Approach 1:
The invention changes the parameter of crystal grain size from fine (conventional) to coarse (15 μm or larger), and simultaneously optimizes alloying element contents (Cu: 0.1-1.0%, Ni: 0.01-0.20%) to achieve both high strength and excellent workability, reversing the conventional parameter relationship
Solution Approach 2:
The invention creates a composite microstructure consisting of coarse α phase grains with precipitated intermetallic compounds (Ti2Cu, Ti2Ni, Ti3Ni) distributed within the grains and at grain boundaries, achieving strength through the composite effect rather than grain refinement
2Strength
If conventional production methods are used to achieve high strength, then strength is improved, but productivity deteriorates due to lengthy production time and cost
Solution Approach 1:
The invention changes the annealing temperature parameter to a specific range (700-850°C) that enables simultaneous achievement of coarse grain structure and intermetallic compound precipitation, reducing production time while maintaining high strength
Solution Approach 2:
The invention performs hot working before final annealing to pre-establish the grain structure, and uses pickling to remove oxides formed during hot working, preparing the material for optimal final annealing and reducing subsequent processing time
3Strength
If Fe content is controlled to low levels for high strength, then strength is improved, but ease of manufacture deteriorates when recycling scrap materials
Solution Approach 1:
The invention changes the Fe content parameter from strictly low (conventional) to a controlled range (0.01-0.10%) that accommodates scrap material variability while maintaining high strength through the coarse grain structure and intermetallic compound precipitation mechanism
Solution Approach 2:
The invention enables recovery and reuse of scrap titanium materials by accepting higher Fe content ranges, incorporating the scrap into the alloy composition while maintaining product quality through the optimized microstructure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method provides a titanium sheet with excellent workability and high strength while enhancing productivity by controlling grain size and alloying element content, reducing production time and costs, and allowing for the use of scrap materials with controlled Fe content.
Implementation Method 1
a method for producing the titanium sheet by performing hot working, pickling, cold working, and final annealing on a titanium product
Implementation Method 2
final annealing is performed at a temperature T (° C.) satisfying a following formula
Implementation Method 3
intermetallic compounds of Cu and/or Ni, and Ti is at 2.0 volume % or less
Data Source
AI summary
A titanium sheet has a chemical composition containing, in mass %, Cu: 0.1 to 1.0%, Ni: 0.01 to 0.20%, Fe: 0.01 to 0.10%, O: 0.01 to 0.10%, Cr: 0 to 0.20%, the balance: Ti and unavoidable impurities, and satisfying 0.04≤0.3Cu+Ni≤0.44%. The average grain size of α phase is 15 μm or larger, and an intermetallic compound of Cu and/or Ni, and Ti is at 2.0 volume % or less. This titanium sheet has excellent workability and high strength.