Thermal Treatment of Steel Sheets Using Personalized Cooling Paths
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Solution Overview
Problem
Existing methods for manufacturing thermally treated steel sheets fail to account for the unique characteristics of each steel grade, leading to inconsistent and suboptimal mechanical properties due to non-personalized cooling treatments, resulting in poor quality and significant dispersion of properties.
Innovation Solution
A method for manufacturing thermally treated steel sheets that involves selecting a product with a microstructure closest to the target, calculating precise cooling paths based on the steel's initial microstructure and chemical composition, and adjusting the cooling system to achieve the desired microstructure and mechanical properties, including phases like ferrite, martensite, bainite, pearlite, and austenite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a standardized cooling cycle is applied to all steel grades, then the manufacturing process is simple and fast, but the mechanical properties show large dispersion and do not meet specific application requirements
Solution Approach 1:
The patent changes the cooling parameters (cooling rate, cooling duration, temperature profiles) based on the specific steel grade and desired microstructure. Different steel grades receive customized cooling parameters to achieve target mechanical properties, resolving the contradiction between standardized fast processing and precision property control
Solution Approach 2:
The cooling cycle is made dynamic and adaptive rather than static and fixed. The system adjusts cooling parameters in real-time based on steel grade identification and target microstructure requirements, enabling both high productivity through automation and high precision through customization
2Manufacturing precision
If a customized cooling treatment is developed for each steel grade, then the mechanical properties are optimized for specific applications, but the calculation time and process complexity increase significantly
Solution Approach 1:
The patent pre-calculates and stores optimal cooling cycles for different steel grades and target microstructures in a database. When production begins, the system simply retrieves the pre-optimized parameters rather than calculating them in real-time, eliminating setup time while maintaining customized optimization for each steel grade
Solution Approach 2:
The system uses reference cooling cycles from a database that have been previously optimized for specific steel grades. These reference cycles are copied and applied with minor adjustments based on the specific production requirements, avoiding redundant calculations while maintaining optimization quality
3Ease of manufacture
If traditional cooling methods are used without considering initial microstructure, then the process is simple to implement, but the final microstructure does not reach the target state and quality is poor
Solution Approach 1:
The system incorporates feedback from the initial microstructure analysis to adjust the cooling cycle parameters. By measuring or characterizing the starting microstructure and using this information to refine the cooling parameters, the system ensures the target microstructure is achieved while maintaining automated implementation
Solution Approach 2:
The initial microstructure is characterized before the cooling process begins, and this preliminary information is used to select or adjust the appropriate cooling cycle. This pre-assessment ensures the correct treatment is applied from the start, achieving both simplicity through automation and reliability through customization
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
This approach ensures that each steel sheet receives a personalized cooling treatment, achieving the desired properties with minimal dispersion, resulting in high-quality steel sheets with consistent mechanical properties across the coil.
Implementation Method 1
a cooling step wherein the steel sheet is cooled according to a cooling path CPx
Implementation Method 2
the initial microstructure mi of the steel sheet to reach mtarget... comprising from 0 to 100% of at least one phase chosen among: ferrite, martensite, bainite, pearlite, cementite and austenite
Data Source
AI summary
A method for manufacturing a thermally treated steel sheet is described. The method includes:A. preparation step containing:1) a selection substep, wherein:a. mtarget and a chemical composition are compared to a list of predefined products, whose microstructure contains predefined phases and predefined proportion of phases, and a product having a microstructure mstandard closest to mtarget and TPstandard is selected, including at least a heating, a soaking and a cooling steps, to obtain mstandard,b. a heating path, a soaking path including a soaking temperature Tsoaking, a power cooling of the cooling system and a cooling temperature Tcooling are selected based on TPstandard and2) a calculation substep, wherein through variation of the cooling power, new cooling paths CPx are calculated based on the product selected in step A.1)a and TPstandard, the initial microstructure mi of the steel sheet to reach mtarget, the heating path, the soaking path comprising Tsoaking and Tcooling, the cooling step of TPstandard is recalculated using said CPx in order to obtain new thermal paths TPx, each TPx corresponding to a microstructure mx,3) a selection substep wherein one TPtarget to reach mtarget is selected, TPtarget being chosen among the calculated thermal paths TPx and being selected such that mx is the closest to mtarget, andB. a thermal treatment step wherein TPtarget is performed on the steel sheet.