Mechanical properties of an Fe-30Mn-4Si-2Al alloy after rolling at different temperatures ranging from 298 to 1073 K-猫眼课题宝

Fe-30Mn-4Si-2Al合金在298至1073 K不同温度下轧制后的机械性能

DOI：

10.1016/j.msea.2018.03.079

发表时间：

2018-05

期刊：

Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing

影响因子：

6.4

通讯作者：

中科院分区：

材料科学1区

文献类型：

作者：

Yin F X;Xia H;Feng J H;Cai M H;Zhang X;Wang G K;Sawaguchi T

研究了 Fe-30Mn-4Si-2Al TRIP/TWIP 钢在 298–1073K 的宽温度范围内轧制时的微观结构演变和相关的机械性能变化。 298K轧制后，广泛的ε马氏体将初始粗晶细化为纳米级片状结构，位错密度较高。轧制温度的升高使变形组织由ε马氏体转变为变形孪晶，位错密度降低。主要重点是强化过程中不同塑性变形机制的贡献。 ε-马氏体和形变孪晶都通过产生霍尔和佩奇效应对强化产生影响。然而，在所有研究温度下，位错在轧制过程中贡献更大。这一观察结果的一个有趣结果是，673K 温轧引起的变形孪晶和室温拉伸变形时发生的 ε-马氏体转变的异步协同作用使该材料明显更强，并提高了加工硬化率。

The microstructure evolution and associated changes of mechanical properties in an Fe-30Mn-4Si-2Al TRIP/TWIP steel subjected to rolling over a wide temperature range of 298–1073 K were studied. The extensive ε-martensite subdivides the initial coarse grains into nanoscale lamella structure after rolling at 298 K, with a high dislocation density. The elevating of rolling temperature changed the deformation microstructure from ε-martensite to deformation twins, as well as a decrease in dislocation density. The main emphasis is on the contribution of different plastic deformation mechanisms involved in the strengthening. Both ε-martensite and deformation twins have an impact on the strengthening by bringing about a Hall & Petch effect. However, dislocation gives more contribution during rolling at all the investigated temperatures. An interesting consequence of this observation is that the asynchronous synergy of deformation twins induced by warm rolling at 673 K and ε-martensitic transformation occurred at room temperature tensile deformation renders this material distinctly stronger with an improved work hardening rate.