Important Metallurgical Parameters that Must be Determined to Control the Properties of Steels During Processing
Recently, great progress has been achieved in the field of physical metallurgy of steels. Especially, the development of controlled rolling has stimulated studies aimed at elucidating the evolution of microstructures in hot-rolled products.
Such fundamental knowledge is now being formulated in a general manner by the aid of theoretical constructions. Computer models of the evolution of microstructures and mechanical properties are being developed on the basis of such formulations. One example is outlined briefly, and important parameters that determine the properties of steels are explained.
Processing variables such as surface temperature, plate thickness, rolling speed, etc.
Variables which are processed from the above ones and which can be directly used in metallurgical formulation such as; through thickness temperature distribution, strain, strain rate and so on.
Intermediate microstructural features such as; austenite grain size, the degree of recrystallization, degree of transformation etc.
In order to utilize the above-mentioned computer modelling for the prediction and control of material properties during processing, the variables of category (ii) must be known. They can be obtained either from the processing variables of category (i) using either models, or direct measurements. At least one feature of category (iii) will probably be necessary for the construction of an on line control system for material properties, because it will greatly contribute to improving the accuracy of feed back or feed forward control.
Nondestructive measurement of the properties of steels is also discussed briefly with special reference to the on-line control processing system.
The on-line control system thus constructed will lead to important innovations in steel production.
KeywordsTransformation Temperature Dual Phase Steel Feed Forward Control High Carbon Steel Solid Solution Hardening
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