Ti43.76Zr12.50Cu37.49-xNi6.25Cox非晶钎料真空钎焊TC4钛合金/316L不锈钢
Vacuum brazing TC4 titanium alloy/316L stainless steel with Ti43.76Zr12.50Cu37.49-xNi6.25Cox amorphous filler metals
韩文倩 1董红刚 1马月婷 1李鹏 1吴宝生 1张亮亮1
作者信息
摘要
根据双团簇模型设计并制备了Ti-Zr-Cu-Ni-Co系非晶钎料,用于真空钎焊TC4钛合金和 316L不锈钢,分析了钎料中Co元素含量对钎焊接头界面微观组织形貌、力学性能及断裂行为的影响规律.结果表明,钎焊接头可划分为TC4/扩散区(Ⅰ区)/钎缝中心区(Ⅱ区)/界面区(Ⅲ区)/316L,界面典型微观组织结构为TC4/β-Ti + Ti2Cu/(Ti,Zr)2(Cu,Ni)+ Ti2Cu + Ti2(Cu,Ni)+ TiFe/(Fe,Cr)2Ti + α-(Fe,Cr)+ τ + γ-(Fe,Ni)+ σ/316L,随着Co元素含量的增加,接头剪切强度先升高后降低再升高,当Co元素含量为 1.56%时达到最大 310 MPa,不添加Co元素时,接头断裂于钎缝中心区(Ⅱ区);当Co元素含量为 1.56%～6.24%时,接头断裂于靠近 316L母材的界面区(Ⅲ区)附近,断裂模式为典型的解理断裂.
Abstract
Ti-Zr-Cu-Ni-Co amorphous filler metals were de-signed and prepared for vacuum brazing of TC4 titanium alloy to 316L stainless steel according to the dual-cluster model.The effect of Co content in filler metals on the microstructure,mechanical properties and fracture behavior of brazed joints was investigated.The results showed that the cross section of brazed joint could be divided into TC4/diffusion zone Ⅰ/braz-ing seam center zone Ⅱ/interface zone Ⅲ/316L.The typical in-terfacial microstructure of the brazed joints was TC4/β-Ti + Ti2Cu/(Ti,Zr)2(Cu,Ni)+ Ti2Cu + Ti2(Cu,Ni)+ TiFe/(Fe,Cr)2Ti + α-(Fe,Cr)+ τ + γ-(Fe,Ni)+ σ/316L.The shear strength of brazed joints first increased,then decreased and then increased with the increase of Co content.The maximum shear strength of 310 MPa was obtained at 1.56%Co.When Co element was not added,brazed joints fractured in the center of the brazing seam(zone Ⅱ).And when the Co content was 1.56～6.24%,brazed joints fractured near the interface zone(zone Ⅲ)of 316L base metal.The fracture mode was typical cleavage fracture.
关键词
真空钎焊/非晶钎料/钛合金/不锈钢异种金属/微观组织/剪切强度Key words
vacuum brazing/amorphous filler metal/ti-tanium alloy/stainless steel dissimilar metal/microstructure/shear strength引用本文复制引用
基金项目
国家自然科学基金资助项目(52275314)
国家自然科学基金资助项目(52075074)
出版年
2024
NETL
NSTL
万方数据