Microstructural and Textural Differences Induced by Water and Furnace Cooling in Commercially Pure Zr Annealed in the α + β Region

Linjiang Chai; Tingting Wang; Yi Ren; Bo Song; Ning Guo; Liangyu Chen

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자료유형: 학술저널

저자정보: Linjiang Chai (Chongqing University of Technology) Tingting Wang (Chongqing University of Technology) Yi Ren (Chongqing Jiaotong University) Bo Song (Southwest University) Ning Guo (Southwest University) Liangyu Chen (Jiangsu University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.4

발행연도: 2018.1

수록면: 673 - 680 (8page)

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In this work, a commercially pure Zr sheet with a typical bimodal basal texture was annealed in an α + β region and thensubjected to Different coolings (in water and furnace). Microstructures and textures of both the as-received and the heat-treatedspecimens were investigated by electron channeling contrast imaging and electron backscatter diff raction techniques. Resultsshow that a duplex microstructure consisting of untransformed bulk α grains and twinned martensitic plates is produced inthe water-cooled specimen, which possesses a weakened texture compared to the initial one. For the specimen cooled in furnace,however, a uniform microstructure fully comprised of coarser equiaxed grains with a strengthened texture is obtained. Analyses reveal that the rapid cooling in water could suppress variant selection behaviors during β → α transformation andallow α plates with scattered orientations to be nucleated inside β phases, contributing to the weakened texture. In contrast,during slow cooling in furnace, β boundaries would act as preferred nucleation sites of α embryos, resulting in a strong variantselection that accounts for the intensifi ed texture.

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참고문헌 신청

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