The Role of Thermomechanical Routes on the Distribution of Grain Boundary and Interface Plane Orientations in Transformed Microstructures
The Role of Thermomechanical Routes on the Distribution of Grain Boundary and Interface Plane Orientations in Transformed Microstructures
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DOI：
10.1007/s11661-016-3630-4
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发表时间：
2017-06-01
影响因子：
2.8
通讯作者：
Rohrer, Gregory S.
中科院分区：
文献类型：
--
作者：
Beladi, Hossein;Rohrer, Gregory S.
在当前的研究中，使用一系列热机械路线来产生不同的微结构（即，铁素体和马氏体）。测量了所有显微组织的五参数晶界特征分布。形变热处理工艺改变了全铁素体组织的织构，显著影响了晶界特征分布的各向异性。通常，（111）面的数量随着铁素体显微组织的γ纤维织构的增加而增加，但在特定的取向差下，它不会改变晶界面分布的形状。在通过不同路线生产的全铁素体组织中，最常见的观察到的边界是{112}对称倾斜边界，具有I 3磅= 60度/[111]取向差;该边界也具有低能量。然而，晶界平面分布被相变路径显著改变（即，铁素体对马氏体）。在马氏体钢中，最多的I3磅晶界是{110}对称倾斜晶界.这是由于与剪切转变相关的晶体学约束（即，马氏体）而不是在扩散相变中占主导地位的低能界面（即，铁氧体）。(C)矿物、金属和材料协会和ASM国际2016
In the current study, a series of thermomechanical routes were used to produce different microstructures (i.e., ferrite and martensite) in low-carbon low alloy steels. The five-parameter grain boundary character distribution was measured for all microstructures. The thermomechanical processing route altered the texture of the fully ferritic microstructure and significantly influenced the anisotropy of the grain boundary character distribution. Generally, the population of (111) planes increased with an increase in the gamma-fiber texture for the ferritic microstructure, but it did not change the shape of the grain boundary plane distribution at specific misorientations. The most commonly observed boundaries in the fully ferritic structures produced through different routes were {112} symmetric tilt boundaries with the I 3 pound = 60 deg/[111] misorientation; this boundary also had a low energy. However, the grain boundary plane distribution was significantly changed by the phase transformation path (i.e., ferrite vs martensite) for a given misorientation. In the martensitic steel, the most populous I 3 pound boundary was the {110} symmetric tilt boundary. This results from the crystallographic constraints associated with the shear transformation (i.e., martensite) rather than the low-energy interface that dominates in the diffusional phase transformation (i.e., ferrite). (C) The Minerals, Metals & Materials Society and ASM International 2016