Transactions of Materials and Heat Treatment

Title：Influence of Mn content on tensile deformation behavior of high manganese austenite TWIP steel for vehicle beams

Authors： Wang Xue Yu Xiutao

Unit： Yellow River Traffic College

KeyWords： high manganese steel TWIP steel deformation twin crystal tensile property strain hardening

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2019,44(9):151-155

Abstract：

For the high manganese austenite TWIP steels with two kinds of Mn contents (mass fraction of 10.5% and 18.5%) for vehicle beams, the mechanical properties, tissue twinning characteristics and work-hardening process were analyzed by room temperature tensile experiment, TEM, SEM and other testing methods. The results show that the increasing of Mn content leads to the decreasing of strength, the increasing of elongation and the decreasing of DSA. Then, the strain hardening process of two kinds of high manganese steels is divided into four stages, and Fe-18.5Mn high manganese steel keeps high strain hardening rate in a wider strain range than that of Fe-10.5Mn high manganese steel. When the strain is 0.1, the partial grains in Fe-10.5Mn high manganese steel change into twin crystals, but only a few grains in Fe-18.5Mn high manganese steel change into twin crystals. When the strain reaches 0.2, the twin crystals of both steels generate at a faster rate, and Fe-18.5Mn high manganese steel has less twin crystals. Furthermore, a single twin crystal exists in the twin beam of the steel matrix, and the average thickness of the twin crystal and the average distance between adjacent twin crystals in Fe-10.5Mn high manganese steel are both smaller than those of Fe-18.5Mn high manganese steel, which forms a more compact twin arrangement state.

Funds：

河南省科技攻关计划项目(154102310028)

王雪（1984-），女，学士，讲师 E-mail：pengwuhe131797@126.com

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