材料科学
碳化物
透射电子显微镜
微观结构
硬化(计算)
位错
碳纤维
复合材料
冶金
结晶学
纳米技术
复合数
化学
图层(电子)
作者
Yasuhito Kawahara,Takuya Maeda,Keisuke Kinoshita,Junko Takahashi,Hideaki Sawada,Ryo Teranishi,Kenji Kaneko
标识
DOI:10.1016/j.matchar.2021.111579
摘要
Low-temperature aging treatment at 323 K results in the dramatical increase in hardness in low-carbon ferritic steels quenched from 983 K, possibly caused by carbon clusters and/or fine ε-carbides. In this study, transmission electron microscopy (TEM) analysis was carried out to characterize the change of the microstructure during the low-temperature aging treatment. Until the early stage of the peak hardness, the carbon clusters were formed homogeneously with zig-zag structures. At the latter stage of the peak hardness, it was found that the ε-carbides were partially precipitated within the carbon clusters, which suggested that the carbon clusters might have acted as the precursors of ε-carbides. In-situ tensile TEM observations showed that dislocation motions were free-glide type, and carbon clusters and fine-carbides interacted with dislocations via cutting-type. Dislocation interaction force was also evaluated, which suggested that the lattice misfit played as important role of the interaction mechanism.
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