Cemented Carbide Base Material for Titanium Alloy Cutting Wear
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Solution Overview
Problem
Titanium alloys are challenging to process due to their high reactivity, which causes melting and deposition on cutting tool edges, leading to chipping and wear. Existing techniques, such as coating cutting tools, are not sufficiently effective in improving tool life to meet market demands.
Innovation Solution
A base material made of cemented carbide with a specific composition and structure is developed. The cemented carbide includes a first hard phase of WC particles and a binder phase of Co and Ni. The surface portion has a thickness less than or equal to the average particle size of the WC particles, and the ratio of the binder phase in the surface to the body portion is between 1.2 and 2.0, optimizing the retention of WC particles and reducing reaction with titanium alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If coating cutting tools to improve wear resistance, then tool life is extended, but the effectiveness is insufficient to meet market demands for processing titanium alloys
Solution Approach 1:
The invention creates a surface portion with different composition and structure from the inner portion. The surface portion has a thickness of 1 μm to 10 μm with specific binder phase distribution (ratio B/A between 0.5 and 2.0), while the inner portion maintains the bulk material properties. This local differentiation allows the surface to provide enhanced wear resistance against titanium alloy processing while the inner portion maintains overall structural integrity, resolving the insufficiency of conventional uniform coatings.
Solution Approach 2:
The invention uses a composite cemented carbide structure with WC particles, Co binder phase, and Ni binder phase distributed differently in the surface versus inner portions. The surface portion has an optimized ratio of binder phases compared to the inner portion, creating a composite material structure that provides superior wear resistance and chemical stability against titanium alloys, thereby meeting market demands that conventional single-phase materials cannot satisfy.
2Strength
If increasing binder phase content to improve toughness, then retention of WC particles is enhanced, but reaction with titanium alloys increases causing accelerated wear
Solution Approach 1:
The invention applies local quality by creating a surface portion with optimized binder phase distribution different from the inner portion. The ratio B/A of binder phase area proportions is controlled between 0.5 and 2.0, allowing the surface to have reduced reactivity with titanium alloys while the inner portion maintains sufficient binder phase for WC particle retention. This spatial differentiation resolves the contradiction between toughness and chemical stability.
Solution Approach 2:
The invention changes the compositional parameters of the binder phase distribution between surface and inner portions. By controlling the ratio B/A of binder phase area proportions and optimizing the thickness of the surface portion (1-10 μm), the material achieves optimal balance between WC particle retention and resistance to titanium alloy reaction, transforming a single-parameter material into a multi-parameter optimized composite structure.
Data Source
AI summary
A base material according to an aspect of the present disclosure is made of a cemented carbide. The cemented carbide includes a first hard phase and a binder phase. The first hard phase consists of WC particles. The binder phase includes at least one element selected from Co and Ni. The base material includes a body portion, and a surface portion provided on a surface of the body portion. The surface portion has a thickness less than or equal to an average particle size in the first hard phase. A ratio (B/A) of an area proportion (B) of the binder phase in a surface of the surface portion to an area proportion (A) of the binder phase in a cross section of the body portion is not less than 1.2 and not more than 2.0.