Zr-Sn-Nb-Cr-Fe锆合金搅拌摩擦焊工艺及焊缝组织和性能
Friction stir welding process microstructure and property of weld for Zr-Sn-Nb-Cr-Fe zirconium alloys
张超 1周猛兵 1陶欣 1郑云西 1王治国 1魏连峰 1杨灿湘1
作者信息
- 1. 中国核动力研究设计院第四研究所,成都, 610213
- 折叠
摘要
文中对Zr-Sn-Nb-Cr-Fe锆合金搅拌摩擦焊(friction stir welding,FSW)工艺、微观组织和腐蚀性能进行了分析.结果表明,采用W-25%Re的搅拌工具在转速 250 r/min、焊接速度 40 mm/min、顶锻压力 10 kN、氩气保护条件下可以获得成形良好且无焊接缺陷的锆合金FSW接头.搅拌区(stir zone,SZ)剧烈的塑性变形促进动态再结晶、合金元素扩散和晶粒细化,晶粒尺寸随着转速增加而增大,同时SZ内在晶界位置处析出大量的形状不规则的第二相粒子.不同焊接参数制备的FSW接头在 360℃、18.6 MPa中性水中腐蚀 72 h后均表现为黑色、光亮、致密的氧化膜,但随着转速增加接头耐腐蚀性能降低.
Abstract
Process performance,microstructure and corro-sion properties of friction stir welded(FSW)joints of Zr-Sn-Nb-Cr-Fe zirconium alloys were studied in the present paper.The results indicate that the recommended zirconium alloys FSW joints with good shape and no welding defects were ob-tained by W-25%Re stir tool under the conditions of 250 rpm rotational speed,40 mm/min welding speed,10 kN axial force and argon protection.In stir zone(SZ),the severe plastic de-formation leads to dynamic recrystallization,diffusion of alloy-ing element and grain refinement and grain size increases with the increase of rotational speed.As the same time,a large number of irregularly shaped second phase particles were pre-cipitated at the grain boundaries.These FSW joints prepared by different welding parameters exhibited black,bright and dense oxide film after being corroded in neutral water at 360℃,18.6 MPa for 72 hours.However,the corrosion resistance of FSW joints decreases with the increase of rotational speed.
关键词
锆合金/搅拌摩擦焊/焊接工艺/微观组织/腐蚀性能Key words
zirconium alloys/friction stir welding/weld-ing process performance/microstructure/corrosion property引用本文复制引用
基金项目
中国核动力研究设计院原创基金(YC228)
出版年
2024
NETL
NSTL
维普
万方数据