Two-Phase Titanium Alloy Rolling for High-Speed Impact Resistance
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Solution Overview
Problem
Existing two-phase titanium alloy plates are low in strength and poor in high-speed impact resistance, which is a challenge for their application in special vehicles requiring enhanced armor performance.
Innovation Solution
A thermal processing method involving sectional heating, reversing rolling, rapid cooling, solution heat treatment, and aging treatment is employed to improve the high-speed impact resistance of two-phase titanium alloy plates. This method includes preheating, heating, and soaking sections with specific temperature and time conditions, followed by transverse and longitudinal rolling stages, and concludes with water-cooling and subsequent heat treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rolling methods are used to process two-phase titanium alloy plates, then the manufacturing process is simple, but the strength and high-speed impact resistance are insufficient
Solution Approach 1:
The heating process is divided into three distinct sections: preheating section (heating rate 10-20°C/min, temperature 20-850°C), heating section (heating rate 20-30°C/min, temperature 850-1050°C), and soaking section (temperature 1040-1060°C, holding time 60-90 minutes). This segmentation allows precise control of temperature distribution and phase transformation, resolving the contradiction by making the complex process manageable and effective.
Solution Approach 2:
The patent implements reversing rolling with specific parameter changes: first transverse rough rolling with reduction rate 15-25% and rolling temperature 990-1030°C, then longitudinal rolling with reduction rate 10-20% and rolling temperature below 990°C. These parameter changes optimize microstructure formation and mechanical properties, achieving high strength and impact resistance.
2Strength
If the final rolling temperature is kept low to maintain plate shape, then the plate shape is maintained, but the microstructure and properties cannot be significantly improved
Solution Approach 1:
The patent performs preliminary high-temperature rolling (990-1030°C) to establish the desired microstructure and mechanical properties before the plate undergoes thermal deformation at lower temperatures. This preliminary action ensures that the plate achieves optimal strength and impact resistance while maintaining shape control during subsequent cooling and heat treatment.
3Strength
If high-temperature rolling is used to improve microstructure, then the microstructure is improved, but the plate shape control becomes difficult
Solution Approach 1:
The rolling process is segmented into transverse rough rolling at high temperature (990-1030°C) for microstructure improvement, followed by longitudinal rolling at lower temperature (below 990°C) for shape control. This temporal and functional segmentation allows each stage to optimize for its specific purpose without compromising the other.
Solution Approach 2:
The patent employs periodic action through reversing rolling, alternating between transverse and longitudinal rolling directions with different temperature regimes. This periodic alternation enables the plate to experience high-temperature microstructure improvement followed by low-temperature shape stabilization, resolving the contradiction between microstructure quality and shape stability.
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 significantly enhances the strength and high-speed impact resistance of the titanium alloy plates, achieving a strength greater than or equal to 1200 MPa and a dynamic compressive strength greater than or equal to 1700 MPa under high strain rates, thereby improving the protective performance of the material.
Implementation Method 1
performing heat preservation for 10-20 minutes at a temperature of 1050-1070° C. in a heating section
Implementation Method 2
c. Water-cooling the rolled blank to a temperature less than 200° C.
Implementation Method 3
performing solution heat treatment and aging treatment on the cooled blank
Implementation Method 4
performing solution heat treatment and aging treatment on the cooled blank
Data Source
AI summary
A thermal processing method for improving high-speed impact resistance of a two-phase titanium alloy includes the steps of: a, heating a two-phase titanium alloy slab blank step by step; b, using a reversing rolling mode to first perform transverse rough rolling, and then reverse a plate blank for longitudinal rolling, and c, water-cooling the rolled plate, and then performing solution heat treatment and aging treatment. According to the method, the anisotropy of transverse and longitudinal properties of the finished plate can be reduced by using a method of two-stage rolling in a β-phase region and an a+β two-phase region, and in combination with rapid cooling after rolling and solid-solution and aging strengthening heat treatment, high strength and excellent high-speed impact resistance of the product can be ensured, and the protective performance of the material is greatly improved.