Fe-Binder Cemented Carbide for Dent-Resistant Cold Rolling Rolls
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Solution Overview
Problem
Conventional cemented carbides with Co-Ni-Cr or Fe-based binder phases lack sufficient compressive yield strength, leading to inadequate performance in cold rolling of steel strips, with issues such as dent formation and insufficient toughness.
Innovation Solution
A cemented carbide composition featuring 55-90% WC particles and 10-45% Fe-based binder phase, with specific elemental ratios and impurity content, sintered to achieve a bainite or martensite phase structure providing compressive yield strength of 1200 MPa or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If Fe-based binder phase is used in cemented carbide, then compressive yield strength is improved, but hardenability and toughness may be insufficient
Solution Approach 1:
The invention optimizes the compositional parameters of the Fe-based binder phase by adding specific amounts of Cr (0.1-5.0 mass%), Si (0.1-2.0 mass%), and C (0.1-1.5 mass%). These parameter adjustments enable the formation of bainite or martensite phases during sintering, which provide both high compressive yield strength (1200 MPa or more) and sufficient hardenability and toughness for cold rolling applications
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 resulting cemented carbide exhibits high compressive yield strength and bending strength, preventing dent formation on rolling surfaces during cold rolling, enabling continuous high-quality rolling with extended roll life.
Implementation Method 1
a cemented carbide composition featuring 55-90% WC particles and 10-45% Fe-based binder phase, with specific elemental ratios and impurity content, sintered to achieve a bainite or martensite phase structure
Data Source
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AI summary
A cemented carbide comprising 55-90 parts by mass of WC particles, and 10-45 parts by mass of an Fe-based binder phase, the binder phase having a composition comprising 2.5-10% by mass of Ni, 0.2-1.2% by mass of C, 0.5-5% by mass of Cr, 0.2-2.0% by mass of Si, 0.1-3% by mass of W, 0-5% by mass of Co, and 0-1% by mass of Mn, the balance being substantially Fe and inevitable impurities, and the cemented carbide being substantially free from composite carbides having major axes of 5 µm or more. This cemented carbide is produced by cooling at a cooling rate of 60°C/hour or more between 900°C and 600°C, after vacuum sintering.