Effect of solution temperature on microstructure and grain boundary distribution characteristic of cold-rolled 690 alloy

doi:10.13251/j.issn.0254-6051.2020.03.029

Abstract

Abstract:

Effect of solution temperatures from 950 to 1100 ℃ on microstructure and grain boundary characteristic distribution of 690 alloy with different deformation rate was studied by means of SEM and EBSD. The results show that the grain size of recrystallization increases rapidly when the temperature over 1070 ℃, and the grain size of the heavier deformed specimens is smaller than that of the slighter deformed specimens. Meanwhile, the solution temperature for the slighter deformed 690 alloy should be lower than that of the heavier deformed specimen. Furthermore, the grain boundary distribution is investigated based on the Coincidence Site Lattice (CSL) theory. After solution treatment, the low angel boundary (LAB) which produced by deformation microstructure is replaced by Σ3 grain boundary with the increase of the number of annealing twins based on the statistic results. The statistic results of grain boundary characteristic distribution show that Σ3 grain boundary isn't increased obviously when temperature over 1030 ℃. In addition, the density of Σ3 grain boundary of the heavier deformed specimen is higher than that of the slighter specimens. It is indicated that the heavier deformation is positive to the density of Σ3 grain boundary. From the statistic results of grain orientation, it can be showed that the proportion of Σ3ⁿ is increased in the deformed 690 alloy after 1030 ℃ solution treatment, especially Σ3 grain boundary. At the same time, the amount of Σ3 grain boundary in the heavier deformed alloy is 19% more than that of the slighter deformed alloy with 17%.

Key words: 690 alloy, solution treatment, grain boundary distribution characteristic, EBSD

CLC Number:

TG156.2

Wang Fangjun, Liu Xuan, Liu Yinglong, Wu Wei. Effect of solution temperature on microstructure and grain boundary distribution characteristic of cold-rolled 690 alloy[J]. HTM, 2020, 45(3): 151-157.

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