锆合金电阻镦焊形成机理及组织演变
Journal of Nuclear Materials
(
IF
3.2
)
Pub Date : 2024-01-12
, DOI:
10.1016/j.jnucmat.2024.154912
Yuanbo Bi
,
Junjing An
,
Li Lu
,
Zhongfeng Xu
,
Zhigang Xie
,
Bingbing Chen
,
Zhenxin Liang
,
Zhiqiang Sun
,
Zhen Luo
端塞（Zr-Sn 合金）和包壳管（Zr-Nb 合金）通过电阻镦焊（RUW）连接。RUW是一种涉及热-电力-磁多场耦合过程的固态焊接方法，兼有摩擦焊和电阻焊的特点。热源包括金属的焦耳热、摩擦热和塑性变形热。这些力包括顶锻力、摩擦力和洛伦兹力。通过温度和力的共同作用，材料经历元素扩散、相变、动态再结晶（DRX）和塑性流动过程，从而形成焊缝。根据显微组织的不同，接头可分为：细晶区（FCZ）、热机械影响区（TMAZ）、热影响区（HAZ）和母材（BM）。焊接过程中，由于高温高压的影响，焊缝区的晶粒尺寸和形貌发生变化，导致焊缝区不同区域的显微组织存在显着差异。变形过程受到滑移和孪晶的协同作用。该接头表现出明显的 DRX 现象。接头的再结晶形式主要有连续动态再结晶(CDRX)、不连续动态再结晶(DDRX)和几何动态再结晶(GDRX)。FCZ和TMAZ中变形织构和再结晶织构同时出现。第二相的形状和分布在接头的不同区域有所不同。
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Formation mechanism and microstructure evolution during resistance upsetting welding of zirconium alloy
The end plugs (Zr-Sn alloy) and cladding tubes (Zr-Nb alloy) were joined by resistance upsetting welding (RUW). RUW is a solid-state welding method involving thermal-electric-force-magnetic multi-field coupling process and has characteristics of both friction welding and resistance welding. The heat sources include joule heating, frictional heating, and plastic deformation heating of the metals. The forces include top forging force, frictional force, and lorentz force. Through the combined effects of temperature and force, the material undergoes the process of elemental diffusion, phase transformation, dynamic recrystallization (DRX) and plastic flow, thus forming the weld. According to different microstructure, the joint could be divided into: fine crystal zone (FCZ), thermal mechanical affected zone (TMAZ), heat-affected zone (HAZ), and base metal (BM). During the welding process, the grain size and morphology of the weld zone change due to the influence of high temperatures and pressures, leading to significant differences in the microstructure across different regions of the weld zone. The deformation process is subject to the synergistic effect of slip and twinning. The joint exhibits evident DRX phenomenon. The recrystallization forms of joint mainly consist of continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX) and geometric dynamic recrystallization (GDRX). Deformation texture and recrystallization texture occur simultaneously in the FCZ and TMAZ. The shape and distribution of the secondary phase vary across different regions of the joint.
更新日期：2024-01-12