Low-alloy ultrahigh-hardness steel and preparation method thereof
By reasonably designing the chemical composition and heat treatment process of low alloy steel, an ultrafine ultrahard micro-nano structure consisting of nano-scale bainite, nanotwin martensite, residual austenite and possible cementite were prepared, which solved the problems of high element content of existing ultra-high hardness steel alloys and complex preparation processes, and achieved significant improvement in hardness and simplification of the process.
CN119640147APending Publication Date: 2025-03-18NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information
- Application Number
- CN202411867857.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-03-18
AI Technical Summary
Technical Problem
The existing ultra-high hardness steel has high alloy elements and complex preparation processes, resulting in high production costs and limited application.
Method used
By rationally designing the chemical composition and heat treatment process of low alloy steel, ultrafine ultrahard micro-nano structures consisting of nanoscale bainite, nanotwin martensite, residual austenite and possible cementite were prepared.
Benefits of technology
Under the condition of lower alloy element content, the hardness of low alloy ultra-high hardness steel is significantly improved, and the hardness can reach 63~68 HRC. At the same time, the preparation process is simplified and production costs are reduced.
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Abstract
The invention discloses low-alloy ultrahigh-hardness steel and a preparation method thereof, and belongs to the technical field of ferrous metallurgy. The raw material of the low-alloy ultrahigh-hardness steel is low-alloy steel; a matrix structure of the low-alloy ultra-high-hardness steel is composed of nanoscale bainite, a nanometer twin-crystal martensite lamella and retained austenite, or composed of nanoscale bainite, a nanometer twin-crystal martensite lamella, retained austenite and cementite. Under the condition that the content of alloy elements is reduced, the low-alloy steel is subjected to simple heat treatment, and the process parameters of the low-alloy steel are regulated and controlled, so that the superfine and superhard micro-nano structure consisting of multiple phases such as nanoscale bainite, nano twin martensite, retained austenite and possibly existing cementite can be prepared; the hardness of the low alloy steel is remarkably improved through the superfine and superhard micro-nano structure. Through alloy component design and micro-nano structure design, the matrix structure of the prepared low-alloy ultrahigh-hardness steel is mainly superfine nano bainite and nano twin martensite lamellas, and the hardness can reach 63-68 HRC.
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