Transactions of Materials and Heat Treatment

Title：Research on critical conditions of dynamic recrystallization for steel 70Cr3Mo

Authors： Chen Fuxiao Cai Zhiwei Wang Yuanyuan Wang Hongbo Zhai Zenggao

Unit： Henan University of Science and Technology Luoyang Generating Equipment Limited Liability Company

KeyWords： steel 70Cr3Mo work hardening rate dynamic recrystallization critical condition

ClassificationCode：TG142.3

year,vol(issue):pagenumber：2015,40(11):107-111

Abstract：

The hot simulation compression tests of steel 70Cr3Mo were conducted under conditions of deformation temperature 850-1150 ℃ and strain rate 0.01-10 s-1 by the Gleeble-1500D thermo-simulation test machine. The critical strain model of dynamic recrystallization for steel 70Cr3Mo during hot deformation was established by using the work hardening rate method to analyze experimental data, combined with the inflection point criterion of lnθ-ε curves and the minimum value criterion of -(lnθ)/ε-ε curves. The results show that the lnθ-ε curves of steel 70Cr3Mo have the characteristics of inflection point and the corresponding -(lnθ)/ε-ε curve have the minimum value. Therefore, the critical state of this alloy is attained, which means the critical strain. The critical strain increases with the decrease of temperature and the increase of strain rate. The predicting model of critical strain can be described by the function of εc=5.4446×10-2Z0.01878.

Funds：

国家自然科学基金资助项目（51105132）

陈拂晓（1962-），男，博士，教授蔡志伟（1989-），男，硕士研究生

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