Transactions of Materials and Heat Treatment

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KeyWords：

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2024,49(2):227-233

Abstract：

The influences of solution treatment on the phase composition, microstructure and tensile properties of high-strength lightweight automotive Fe-30Mn-10Al-2C steels in forging and aging states were studied by metallographic microscope, hardness tester, tensile testing machine and other methods, and its mechanism of action was analyzed. The results show that the microhardness of automotive steel in solid solution state gradually decreases with the increasing of solution temperature from 950 ℃ to 1200 ℃ at different solution time. Under the same aging process, the higher the solution temperature, the greater the microhardness of automotive steel. When the solution temperature is 1100 ℃, the hardening characteristics of automotive steel are relatively obvious. With the increasing of solution temperature, the grain size of automotive steel in solid solution state gradually increases. When the solid solution temperature rises to 1150 ℃ and above, high temperature ferrite phase δ appears in the automotive steel. When the solid solution time and the aging process are the same, the strength-ductility balance of aged automotive steel first increases and then decreases as the solid solution temperature increases. 1100 ℃/1 h+500 ℃/4 h is the suitable solid solution and aging heat treatment systems for automotive steel. At this time, the automotive steel has the highest strength-ductility balance of 45.66 GPa·%.

Funds：

基金项目:河南省杰出人才创新基金资助项目(182102610014)

作者简介：李韬（1980-），男，硕士，讲师

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