In situ characterization of Grade 92 steel during tensile deformation using concurrent high energy X-ray diffraction and small angle X-ray scattering
In situ characterization of Grade 92 steel during tensile deformation using concurrent high energy X-ray diffraction and small angle X-ray scattering
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DOI：
10.1016/j.jnucmat.2013.04.063
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发表时间：
2013-09-01
影响因子：
3.1
通讯作者：
Almer, Jonathan
中科院分区：
文献类型：
--
作者：
Wang, Leyun;Li, Meimei;Almer, Jonathan
采用同步高能X射线衍射（HE-XRD）、X射线照相和小角X射线散射（SAXS）技术，在室温（RT）、400 ℃和650 ℃下对92级钢的拉伸变形进行了原位研究。温度依赖性的弹性性能，即杨氏模量和泊松比，测量α-Fe基体，M23 C6和Nb（C，N）相在各种晶体取向。α-Fe基体、M23 C6和Nb（C，N）析出相的晶格应变、峰展宽/锐化和空洞发展的显著差异揭示了合金在低温和高温下明显不同的变形和损伤机制。在室温下，用晶格应变测量的每种析出相的强化效果都符合位错堆积模型，而在650 ℃下观察到不同的位错行为。通过SAXS测量的作为应变的函数的空隙体积分数可以通过经典的空隙成核和生长模型在室温下而不是在650 ° C下描述，这意味着在高温下的不同损伤过程。(C)2013爱思唯尔有限公司版权所有。
The tensile deformation in Grade 92 steel was studied in situ using simultaneous high energy X-ray diffraction (HE-XRD), radiography, and small angle X-ray scattering (SAXS) at room temperature (RT), 400, and 650 degrees C. Temperature-dependent elastic properties, i.e. Young's modulus and Poisson's ratio, were measured for alpha-Fe matrix, M23C6 and Nb(C,N) phases in various crystallographic orientation. Significant differences in the evolution of lattice strain, peak broadening/sharpening, and void development in the a-Fe matrix, M23C6 and Nb(C,N) precipitates revealed markedly different deformation and damage mechanisms at low and high temperature in the alloy. The strengthening effect of each type of precipitates measured by lattice strain agrees with the dislocation pile-up model at room temperature, while a different dislocation behavior was observed at 650 degrees C. Void volume fraction as a function of strain measured by SAXS can be described by a classic void nucleation and growth model at room temperature but not at 650 degrees C, implying a different damage process at high temperature. (C) 2013 Elsevier B.V. All rights reserved.