Characterization of microstructural strengthening in the heat-affected zone of a blast-resistant naval steel

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• 作者：Xinghua Yu ; Jeremy L. Caron ; S.S. Babu ; John C. Lippold ; Dieter Isheim ; David N. Seidman
• 关键词：Steels ; Atom-probe field-ion microscopy (APFIM) ; Electron backscatter diffraction (EBSD) ; Precipitation strengthening ; Grain boundary segregation
• 刊名：Acta Materialia
• 出版年：2010
• 出版时间：October 2010
• 年：2010
• 卷：58
• 期：17
• 页码：5596-5609
• 全文大小：3745 K

文摘

The influence of simulated heat-affected zone thermal cycles on the microstructural evolution in a blast-resistant naval steel was investigated by dilatometry, microhardness testing, optical microscopy, electron backscatter diffraction and atom-probe tomography (APT) techniques. Coarsening of Cu precipitates were observed in the subcritical and intercritical heat-affected zones, with partial dissolution in the latter. A small number density of Cu precipitates and high Cu concentration in the matrix of the fine-grained heat-affected zone indicates the onset of Cu precipitate dissolution. Cu clustering in the coarse-grained heat-affected zone indicated the potential initiation of Cu reprecipitation during cooling. Segregation of Cu was also characterized by APT. The hardening and softening observed in the heat-affected zone regions was rationalized using available strengthening models.