Strain partitioning in ultra-fine grained medium-manganese transformation induced plasticity steel
Strain partitioning in ultra-fine grained medium-manganese transformation induced plasticity steel
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DOI：
10.1016/j.msea.2014.03.120
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发表时间：
2014-07-15
期刊：
影响因子：
6.4
通讯作者：
Matlock, D. K.
中科院分区：
文献类型：
--
作者：
Gibbs, P. J.;De Cooman, B. C.;Matlock, D. K.
对7.1-Mn0.1-C相变诱发塑性钢在600℃和650℃下进行168h亚温处理，获得了具有随退火温度变化的残余奥氏体量和拉伸性能的超细晶组织。利用原位中子衍射仪，通过测量变形过程中的相分数、弹性相应变和衍射峰展宽来研究拉伸性能的变化。650℃退火钢的奥氏体相变控制了初始屈服，并观察到应力诱发相变。相反，600℃退火后的屈服受铁素体塑性变形的控制，奥氏体相变只有在屈服点伸长后才开始发生。在晶格应变和峰宽数据中，组分之间的变形顺序很明显。在变形过程中，奥氏体区始终存在压缩晶格应变，两种钢的铁素体塑性变形始于700 Mpa左右，拉应力优先传递给形变诱发马氏体。奥氏体压应变的发展与奥氏体向马氏体转变过程中体积膨胀的抑制有关。(C)2014爱思唯尔B.V.保留所有权利。
A 7.1-Mn 0.1-C transformation-induced plasticity steel was intercritically annealed at 600 degrees C and 650 degrees C for 168 h. Ultra-fine-grained microstructures with annealing temperature dependent retained austenite fractions and tensile properties were produced. in situ neutron diffraction was used to investigate the change in tensile properties via measurement of phase fractions, elastic phase strains, and diffraction peak broadening during deformation. Austenite transformation to martensite controlled initial yielding in the 650 degrees C annealed steel and stress induced transformation was observed. In contrast, yielding after annealing at 600 degrees C was controlled by plastic deformation of ferrite, with austenite transformation initiating only after yield point elongation. The sequence of deformation between constituents was readily apparent in the lattice strain and peak width data. During deformation, compressive lattice strains were always developed in austenite, ferrite plastic deformation initiated around 700 MPa in both steels, and tensile stress was preferentially transferred to deformation-induced martensite. The development of compressive strains in austenite was related to constraint of the volume expansion during austenite transformation to martensite. (C) 2014 Elsevier B.V. All rights reserved.