Cermet Cutting Insert Composition for Wear-Toughness Balance
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Solution Overview
Problem
Cermets containing titanium (Ti) with TiCN particles have low fracture toughness, limiting their use in applications requiring high wear and chipping resistance, such as cutting tools, due to insufficient fracture resistance.
Innovation Solution
A cermet insert with TiCN hard particles and a bonded phase containing iron group metals like Ni and Co, where the second region of the hard particles has a higher concentration of metal elements like V, Nb, Ta, Cr, Mo, W, and Ni, exceeding 9.5 mass %, enhancing fracture resistance and toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If TiCN particles are used as hard particles in cermet, then wear resistance and chipping resistance are improved, but fracture toughness deteriorates
Solution Approach 1:
The invention creates a core-shell structure where the TiCN hard particle has a central core region and a shell region with different compositional characteristics. The shell region contains a higher concentration of metal elements (Ni, Co, V, Nb, Ta, Cr, Mo, or W) compared to the core, forming a gradient structure that locally modifies properties at the particle periphery to improve fracture toughness while maintaining the hard core's wear resistance
Solution Approach 2:
The invention creates a composite structure within each hard particle by combining TiCN with metal elements (Ni, Co, V, Nb, Ta, Cr, Mo, or W) in a core-shell arrangement. This internal composite structure allows the hard core to provide wear resistance while the metal-element-rich shell provides toughness, resolving the contradiction between hardness and fracture resistance
2Strength
If TiCN particles are used as hard particles in cermet, then chipping resistance is improved, but fracture toughness deteriorates
Solution Approach 1:
The invention creates a core-shell structure where the TiCN hard particle has a central core region and a shell region with different compositional characteristics. The shell region contains a higher concentration of metal elements (Ni, Co, V, Nb, Ta, Cr, Mo, or W) compared to the core, forming a gradient structure that locally modifies properties at the particle periphery to improve fracture toughness while maintaining the hard core's chipping resistance
Solution Approach 2:
The invention creates a composite structure within each hard particle by combining TiCN with metal elements (Ni, Co, V, Nb, Ta, Cr, Mo, or W) in a core-shell arrangement. This internal composite structure allows the hard core to provide chipping resistance while the metal-element-rich shell provides toughness, resolving the contradiction between chipping resistance and fracture resistance
Data Source
AI summary
A cermet, as a base, containing a plurality of hard particles and a bonded phase between the plurality of hard particles. Each of the plurality of hard particles, when viewed in cross section, includes a first region containing Ti, N, and C, and contains a titanium carbonitride phase as a main constituent. Each of the plurality of hard particles, when viewed in cross-section, includes a second region containing one or more metal elements selected from the group consisting of V, Nb, Ta, Cr, Mo, W, Co, and Ni in a larger amount than the first region. The content of the one or more metal elements in the second region is 9.5 mass % or more in a total amount. A cutting tool has a length extending from a first end to a second end, and includes a holder and the insert described above.