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Advanced Welding and Joining of Corrosion Resistant Nb-W Alloy

耐腐蚀铌钨合金的先进焊接与连接

基本信息

批准号：
17560634
负责人：
SAIDA Kazuyoshi
金额：
$ 2.24万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560634/
关键词：
Nb-W alloy Fusion welding Diffusion bonding Explosive bonding Insert metal Microstructure of bond layer Joint strength Toughness Nb-5W合金界面反応継手特性固相拡散接合パルス通電接合

项目摘要

Weldability of Nb-5%W alloy was investigated using GTA and EB welding. The HAZ softening occurred in GTA welds and joint strength was reduced to approx. 300MPa. The HAZ softening was inhibited and joint strength was improved in EB welds, while toughness of EBW joint was much less than that of base metal.Dissimilar diffusion bonding of Nb-5%W alloy to SUS304ULC stainless steel was conducted. The reaction layers of Fe-Nb intermetallic compounds were formed at the bond interface and growth kinetics of them were followed by the parabolic law. Tensile strength of joint attained the maximum value of approx. 200MPa at the reaction layer thickness of 8μm..Diffusion bonding of Nb-5%W alloy to SUS304ULC stainless steel using Ta insert metal was conducted. An obvious reaction layer was not formed at the Nb-W/Ta interface, while reaction layer consisted of TaFe2 and TaCr2 could be observed at the Ta/SUS304ULC interface. Tensile strength of Ta-inserted joint (Nb- W/Ta/SUS304ULC joint) was a maximum of approx. 250MPa.Explosive bonding of Nb-5%W alloy to SUS304ULC stainless steel was examined. The characteristic wavy interface and very few reaction products were formed at the bond interface, and hardening of bond interface hardly occurred in the explosive bonded joint. Explosive bonding of Nb-5%W alloy to SUS304ULC stainless steel using Ta insert metal was conducted in order to improve the joint properties. Although a solid solution forcibly mixed Ta with Nb-W was formed at the Nb-W/Ta interface, hardening of bond interface was very slight. Shear test of explosive bonded joints of Nb-W/SUS304ULC, Nb-W/Ta and Ta/SUS304ULC revealed that every joint was fractured in the Nb-W or Ta base metal, and that shear strengths of the joints were almost comparable to those of base metals.

研究了Nb-5%W合金的GTA和EB焊接性能。GTA焊缝出现了热影响区软化，接头强度降低到约.300 Mpa。电子束焊接抑制了焊接热影响区的软化，提高了接头强度，但电子束焊接接头的韧性远低于母材。在界面处形成了Fe-Nb金属间化合物的反应层，其生长动力学符合抛物线规律。接头的抗拉强度达到最大值，约为。在反应层厚度为8μm，压力为200 Mpa的条件下，用Ta镶嵌金属进行了Nb-5%W合金与SUS304ULC不锈钢的扩散连接。在Nb-W/Ta界面上没有形成明显的反应层，而在Ta/SUS304ULC界面上观察到由TaFe2和TaCr2组成的反应层。含Ta的接头(Nb-W/Ta/SUS304ULC接头)的最大抗拉强度约为。250 MPa.研究了Nb-5%W合金与SUS304ULC不锈钢的爆炸连接。爆炸连接接头界面呈波浪状特征，反应产物很少，几乎不发生界面硬化。为了改善Nb-5%W合金与SUS304ULC不锈钢的连接性能，采用Ta镶嵌金属对其进行了爆炸连接。虽然在Nb-W/Ta界面形成了Ta与Nb-W强制混合的固溶体，但结合界面的硬化非常轻微。对Nb-W/SUS304ULC、Nb-W/Ta和Ta/SUS304ULC爆炸连接接头的剪切试验表明，每个接头都是在Nb-W或Ta母材上断裂的，接头的剪切强度与母材相当。