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首页> 外文会议>Riso international symposium on materials science >Synchrotron measurements of local microstructure and residual strains in ductile cast iron
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Synchrotron measurements of local microstructure and residual strains in ductile cast iron

机译：同步铸铁测量球墨铸铁局部组织和残余应变

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The local microstructure and distribution of thermally induced residual strains in ferrite matrix grains around an individual spherical graphite nodule in ductile cast iron (DCI) were measured using a synchrotron X-ray micro-diffraction technique. It is found that the matrix grains are deformed, containing dislocations and dislocation boundaries. Each of the residual strain components in the matrix grains exhibits a complex pattern along the circumferential direction of the nodule. Along the radial direction of the nodule, strain gradients from the interface to the grain interior are seen for some strain components, but only in some matrix grains. The observed residual strain patterns have been analysed by finite element modelling, and a comparison between the simulation and experiments is given. The present study of local residual stress by both experimental characterization and simulation provide much needed information for understanding the mechanical properties of DCI, and represent an important contribution for the microstructural design of new DCI materials.
机译：使用同步加速器X射线微衍射技术测量了球墨铸铁（DCI）中单个球形石墨球周围铁素体基体晶粒中热诱导残余应变的局部微观结构和分布。发现基体晶粒变形，包含位错和位错边界。基体晶粒中的每个残余应变分量都沿着结节的圆周方向显示出复杂的图案。沿着结节的径向，对于某些应变分量，可以看到从界面到晶粒内部的应变梯度，但仅在某些基体晶粒中可见。通过有限元建模对观察到的残余应变模式进行了分析，并进行了仿真和实验之间的比较。目前通过实验表征和模拟对局部残余应力进行的研究为理解DCI的力学性能提供了非常必要的信息，并为新型DCI材料的微观结构设计做出了重要贡献。

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