Joining of titanium to 304L stainless steel by friction welding
Joining of titanium to 304L stainless steel by friction welding
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DOI：
10.1016/j.jmatprotec.2009.06.018
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发表时间：
2009-09-19
影响因子：
6.3
通讯作者：
Rao, K. Prasad
中科院分区：
文献类型：
--
作者：
Dey, H. C.;Ashfaq, M.;Rao, K. Prasad
钛（Ti）与304L不锈钢（SS）的异种金属接头在核工业中是必不可少的，用于溶解器容器（由Ti制成）中的沸腾硝酸中溶解乏燃料，溶解的溶液通过304L SS管道输送到由304L SS制成的其他工厂部件。由于放射性环境，这种异种金属接头的密封性和耐腐蚀性非常重要。在这项工作中，尝试用摩擦焊接的方法将Ti与304L SS连接起来。Ti与304L SS直接摩擦焊接的结果是焊缝强度更强，在拉伸试验中，Ti母材发生失效。然而，由于机械合金化形成了金属间化合物，接头的弯曲延展性几乎为零。结合界面附近Ti的应变硬化和残余应力。焊后热处理由于消除了应变硬化和接头界面残余应力的影响，使弯曲延展性略微提高到5度。根据ASTM A-262 Practice C在沸腾硝酸中的腐蚀试验表明，在腐蚀试验后接头保持完整的情况下，平均腐蚀速率为10英里/小时。讨论了力学试验的细节，用光学显微镜和扫描电镜进行了微观结构分析。(C) 2009 Elsevier B.V.版权所有
The dissimilar metal joint of titanium (Ti) to 304L stainless steel (SS) is essential in the nuclear industry for the dissolution of spent fuel that is carried out in boiling nitric acid in the dissolver vessel (made of Ti) and the dissolved solution is transported through the 304L SS pipes to the other plant components made of 304L SS. Because of the radioactive environment, leak tightness and corrosion resistance of this dissimilar joint are important. In this work, friction welding process was attempted to join Ti to 304L SS. Direct friction welding of Ti to 304L SS results in a stronger weld in which failure occurs in the Ti base metal during tensile testing. However, the joints have almost zero bend ductility that has been attributed to the formation of intermetallics due to mechanical alloying. strain hardening of Ti near the joint interface and residual stresses. Post-weld heat treatment marginally increases the bend ductility to 5 degrees because of relieving of the effects of strain hardening and of residual stresses at the joint interface. Corrosion test in boiling nitric acid as per ASTM A-262 Practice C shows that the average corrosion rate is 10 mpy with the joints remaining intact after the corrosion test. The details of mechanical tests, microstructure analysis using optical and scanning electron microscopy, are discussed. (C) 2009 Elsevier B.V. All rights reserved.