Method for predicting hot rolled steel austenite static recrystallization structure evolution

Abstract

The invention relates to a method for predicting hot rolled steel austenite static recrystallization structure evolution and provides a hot rolled austenite static recrystallization structure evolution prediction method by taking a strain capacity epsilon 0.5 required for the static recrystallization of 50 percent of austenite as a core. The method comprises two parts, i.e. predicting an austenite static recrystallization structure evolution rule by taking typical interval in pass trf and strain rate as boundary conditions, and conducting prediction and correction aiming at the different intervals and strain rates of practical hot rolling passes. By adopting the method, the accurate prediction of the austenite static recrystallization structure evolution rule can be realized through fewer parameters, the optimized setting of hot rolling technological parameters can be realized accordingly, the number of basic tests can be reduced, the development period of steel types can be shortened and the method is suitable for the steel types such as C-Mn steel, C-Mn-Nb steel and the like which require for rolling control.

Description

technical field [0001] The invention relates to a method for predicting the evolution of hot-rolled steel austenite static recrystallization structure, and belongs to the technical field of steel rolling. Background technique [0002] The austenite recrystallization process plays an important role in the evolution of the microstructure and properties of hot-rolled steel. To understand the austenite recrystallization law of different steels is crucial for formulating a reasonable controlled rolling process, improving the effect of controlled rolling, and improving the strength of steel. Resilience can be of great significance. Austenite recrystallization process is a complex process, including static recrystallization, dynamic recrystallization and sub-dynamic recrystallization. The recrystallization behavior of austenite is mainly affected by the following factors: initial grain size d o , Deformation temperature T D , strain ε, strain rate ε and pass interval t (or air d...

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Problems solved by technology

[0007] Using the above method to study the change of austenite static recrystallization with the pass interval time t is of great significance for the physical and metallurgical basic research of austenite hot deformation; but for the actual process-structure-performance control of the hot rolling mill For each type of composition system steel, the research on the change law of austenite static recrystallization fraction and static recrystallization grain size with pass interval time, strain rate, strain amount, deformation temperature and austenite grain size has been carried out. Large volume and long cycle

Such as S.F.MEDINA et al.'s research on the evolution law of austenite static recrystallization of C-Mn, C-Mn-Nb and C-Mn-V steels (see ISIJ International, 34(8), 1994, pp.689- 696 and ISIJ International, 41(7), 2001, pp.774-781), for determining t 0.5 The relationship between the four parameters of strain rate, strain amount, deformation temperature and austenite initial grain size, the time interval between passes, strain rate, strain amount, deformation temperature and austenite initial grain size should be considered at the same time in the test design The impact of the five parameters of size, because there are many parameters involved, it is necessary to conduct multi-level tests of five factors, the test workload is heavy and the process is cumbersome

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