Deformation mechanisms of IN713C nickel based superalloy during Small Punch Testing
Deformation mechanisms of IN713C nickel based superalloy during Small Punch Testing
复制标题
DOI：
10.1016/j.msea.2015.10.056
复制
发表时间：
2016
期刊：
影响因子：
6.4
通讯作者：
M. Coleman;H. Alshehri;R. Banik;W. Harrison;S. Birosca
中科院分区：
文献类型：
--
作者：
M. Coleman;H. Alshehri;R. Banik;W. Harrison;S. Birosca
局部微观结构的作用对于铸造合金的材料性能和完整性至关重要。晶粒尺寸和晶界分布以及局部织构可以产生各种微观结构/微观织构簇，从而导致合金中的变形局部化。 Inconel 713C 镍基高温合金通过熔模铸造生产，用作现代柴油发动机的涡轮增压器涡轮叶轮。在这种合金中，在使用过程中非常期望出现局部变形，因为除了铸造合金中不均匀的微观结构和微观纹理之外，由于铸造几何因素，部件中的应变分布不均匀。在当前的研究中，IN713C 在室温和 650°C 的空气环境中进行了小冲头 (SP) 拉伸测试，行程控制为 0.02 mm/s。使用扫描电子显微镜 (SEM) 和电子背散射衍射 (EBSD) 进行断裂表面检查和微观结构表征以及详细的织构分析。还对 SP 测试进行了有限元 (FE) 分析，以研究应力状态对局部变形的作用。很明显，盘中存在的晶粒形貌和原始织构等微观结构参数是控制混合柱状/等轴（过渡）盘微观结构变形织构的最影响因素。然而，温度是全柱状圆盘微观结构的晶粒旋转和织构变化的决定参数。
The role of local microstructure is critical in materials performance and integrity in a cast alloy. The grain size and grain boundary distributions as well as local texture can create various microstructure/microtexture clusters that cause deformation localisation in the alloy. Inconel 713C nickel base superalloys are used as turbocharger turbine wheels for modern diesel engines, produced via investment casting. In such an alloy localised deformation is highly expected during service, as the strain distribution is not uniform in the component due to casting geometrical factors in addition to non-homogenous microstructure and microtexture in the cast alloy. In the current investigation Small Punch (SP) tensile tests were carried out on IN713C at room temperature and 650 °C in an air environment under stroke control at a rate of 0.02 mm/s. The fracture surface examination and microstructure characterisation as well as detailed texture analyses were performed using Scanning Electron Microscopy (SEM) and Electron Backscatter Diffraction (EBSD). Finite Element (FE) analysis of the SP test was also implemented to investigate the role of stress state on the local deformation. It was evident that microstructure parameters such as grain morphology and original texture existed in the disc were the most influential factors in governing the deformation texture in mixed columnar/equiaxed (transition) disc microstructure. Whereas, the temperature was the determining parameter in grain rotations and texture changes for wholly columnar disc microstructures.