首页|EBSD-based analysis of the stress rupture behaviors for Ni-based superalloy IN718
EBSD-based analysis of the stress rupture behaviors for Ni-based superalloy IN718
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The optimized stress rupture properties of IN718 are of great interest to the aerospace industry,particularly in the presence of a notch.The deformation mechanisms for the stress rupture properties of IN718 after different heat treatments,using electron back-scattered diffraction(EBSD)as an important tool,were investigated.The notch sensitivity of IN718 was closely associated with the distribution of the 8 phase.When the area fraction(A(f))of the 8 phase was less than 0.56％,the sample failed at the notch;while when A(f)≥2.98％,the notch sensitivity disappeared,and failure occurred on the smooth gauge.Heterogeneous deformation with strain concentrated at the grain boundaries was observed for the notch-and smooth-gauge-failed samples through EBSD analysis.Although intergranular cracking was detected in both cases,the failure mechanisms were different.Grain boundary sliding was the dominant failure mechanism for the notch-failed samples,whereas microvoid coalescence was the dominant failure mechanism for the smooth-gauge-failed samples.
IN718notch sensitivitystress rupturekernel average misorientation(KAM)grain reference orientation deviation(GROD)
YE Ruoru、LI Jidong、GU Yu
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R&D Center of Stainless Steel,Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201999,China
State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Iron & Steel(Group)Co.,Ltd.,Taiyuan 030003,China
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NSTL
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