轧制工艺对N36锆合金带材微观结构的影响

doi:10.13251/j.issn.0254-6051.2020.11.027

摘要/Abstract

摘要： 利用扫描电镜(SEM)、透射电镜(TEM)和电子背散射衍射(EBSD)等方法,对不同轧制工艺制备的N36锆合金带材中的第二相、晶粒尺寸和微观织构进行了研究。结果表明,锆合金带材中织构主要以{0001}$\bar{1}2\bar{1}0$和{0001}$01\bar{1}0$两类基面织构为主,第二相粒子主要为HCP型Zr(Nb, Fe)₂粒子。在热轧总变形量一致的情况下,热轧工艺道次变形量的变化对最终带材的晶粒尺寸和微观织构影响不大,但是对第二相粒子的尺寸有很大影响。热轧过程第一道次变形量越大,最终带材中第二相粒子尺寸越小。在热轧过程中,换向轧制会影响最终带材的织构组成,也会促进锆晶粒的[0001]轴平行于带材的ND方向;同时在带材的轧面(RD-TD 面)上,晶粒的取向性减弱,晶粒取向更加随机。终轧过程中的变形量增大,会使最终带材的晶粒尺寸减小,再结晶程度提高,使得最终带材中{0001}$\bar{1}2\bar{1}0$织构增强,而{0001}$01\bar{1}0$织构减弱。

关键词: N36锆合金, 带材, 轧制, 织构, EBSD

Abstract: The second phase, grain size, and micro-texture of N36 zirconium alloy strips processed through different rolling ways were investigated by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD). The results show that the textures of N36 alloy strip are mainly consist of {0001}$\bar{1}2\bar{1}0$ and {0001}$01\bar{1}0$ basal texture, and the second phase is mainly HCP type Zr(Nb, Fe)₂ particles. With the same total hot deformation, the deformation rate changes of each hot rolling pass have a little effect on the grain size and texture of the final strip but play an important role in the size of second phase particles(SPPs). With the larger deformation rate of the first hot rolling pass, the size of SPPs in final strip are smaller. During the hot rolling, the texture composition of final strips is affected by using cross rolling process, and also the [0001] axis of Zr lattice is more inclined to parallel to the normal direction (ND) of the strips. Meanwhile the grain is more scattering rotated on the RD-TD plane. In addition, during the final rolling of final strips, a larger deformation leads to a smaller grain size and a higher degree of recrystallization, which strengthens the {0001}$\bar{1}2\bar{1}0$ texture, and weakens the {0001}$01\bar{1}0$ texture.

Key words: N36 zirconium alloy, strip, rolling, texture, EBSD

中图分类号:

TG146.4

贾玉振, 邱军, 杨忠波. 轧制工艺对N36锆合金带材微观结构的影响[J]. 金属热处理, 2020, 45(11): 148-153.

Jia Yuzhen, Qiu Jun, Yang Zhongbo. Influence of rolling ways on microstructure of N36 zirconium alloy strip[J]. Heat Treatment of Metals, 2020, 45(11): 148-153.

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