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Characterization of localized deformation near grain boundaries of superalloy Rene-104 at elevated temperature

机译:高温下Rene-104合金晶界附近局部变形的表征

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in situ surface deformation measurement techniques were applied to characterize strain localization sites in nickel-based superalloys when tested under constant load at 700 ℃. Deformation maps were coupled with electron backscatter diffraction (EBSD) measurement of grain location and orientation to correlate localization sites with underlying surface microstructure. Superalloy Rene-104 was heat treated and quenched to create two microstructures with similar grain sizes but different grain boundary character: the standard microstructure had microscopically planar grain boundaries, and the other microstructure had serrated grain boundaries. Analysis of full field strain maps calculated from in situ scanning electron microscopy (SEM) images indicated distinct differences in strain localization as a function of total strain for the two microstructures. The standard microstructure showed very little intra-granular strain accumulation, and annealing twin boundaries played an important role in strain localization sites, whereas the serrated microstructure experienced strain accumulation more evenly throughout the microstructure. Grain boundary sliding (GBS) was observed in both microstructures, but the development of serrated grain boundaries significantly decreased the contribution of this mechanism to the overall strain accommodation from 20% to 14% of the total plastic strain being accommodated by GBS.
机译:采用原位表面形变测量技术表征了镍基高温合金在700℃恒压下的应变局部化特征。变形图与晶粒位置和取向的电子反向散射衍射(EBSD)测量相结合,以将定位位点与下面的表面微观结构相关联。对Rene-104高温合金进行热处理和淬火,以创建两个具有相似晶粒尺寸但具有不同晶界特征的显微组织:标准显微组织具有微观平面晶界,而其他显微组织具有锯齿状晶界。从原位扫描电子显微镜(SEM)图像计算得出的全场应变图分析表明,对于两种微观结构,应变局部化与总应变的函数存在明显差异。标准的显微组织显示出极少的晶内应变积累,而退火双晶界在应变定位部位中起着重要作用,而锯齿状的显微组织在整个显微组织中经历的应变积累更为均匀。在两个微观结构中均观察到晶界滑动(GBS),但锯齿状晶界的发展显着降低了该机制对总应变适应的贡献,从GBS所适应的总塑性应变的20%降至14%。

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