Cemented Carbide Microstructure for Crack-Resistant Cutting Tools
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Solution Overview
Problem
There is a growing demand for cost reduction and extended tool service life, particularly in high-efficiency processing, where existing cemented carbides do not adequately provide long-lasting tools.
Innovation Solution
A cemented carbide composition with tungsten carbide grains and a binder phase, where the total content is no less than 80 vol%, with a binder phase content between 0.1 vol% and 20 vol%, exhibiting a first peak in orientation differences between 29.5° and 30.5°, and a second peak between 89.5° and 90.5°, enhancing crack suppression and grain interface strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the binder phase content is increased to improve toughness and crack suppression, then the service life is extended, but the hardness and wear resistance deteriorate
Solution Approach 1:
The invention changes the critical parameter of binder phase content to a specific range (0.1-20 vol%) and controls the orientation difference distribution with a first peak at 29.5-30.5°, which optimizes the balance between toughness and hardness, resolving the contradiction between service life and wear resistance
Solution Approach 2:
The invention creates a composite microstructure where tungsten carbide grains with specific orientation arrangements are combined with a controlled binder phase, forming a composite material that achieves both high toughness and high hardness simultaneously
2Strength
If the total content of tungsten carbide grains and binder phase is increased to improve density and strength, then the mechanical properties are enhanced, but the manufacturing complexity increases
Solution Approach 1:
The invention specifies precise parameter ranges (total content ≥80 vol%, binder phase 0.1-20 vol%, orientation difference peak at 29.5-30.5°) that guide the sintering process, achieving high mechanical properties while simplifying manufacturing control through defined parameter windows
Data Source
AI summary
A cemented carbide including tungsten carbide grains and a binder phase, in which a total content of the tungsten carbide grains and the binder phase in the cemented carbide is no less than 80 vol %, a content of the binder phase in the cemented carbide is no less than 0.1 vol % and no more than 20 vol %, in a histogram showing distribution of orientation differences between adjacent pairs each consisting of two of the tungsten carbide grains adjacent to each other in the cemented carbide, a first peak is present in a class of the orientation differences of no less than 29.5° and less than 30.5°.