Residual stress, microstructure and corrosion behavior in the 316L/Si3N4 joint by multi-layered braze structure-experiments and simulation
Residual stress, microstructure and corrosion behavior in the 316L/Si3N4 joint by multi-layered braze structure-experiments and simulation
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多层钎焊结构316L/Si3N4接头的残余应力、显微组织和腐蚀行为-实验与模拟
DOI：
10.1016/j.ceramint.2022.07.218
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发表时间：
2022-07
影响因子：
5.2
通讯作者：
Jie Zhang
中科院分区：
文献类型：
--
作者：
Songsong Guo;Liangbo Sun;Jian Fang;Jie Zhang
本研究通过有限元模型模拟设计了不同形状的Mo中间层来消除Si3N4/316L接头中的残余应力。结果发现，半圆柱形开槽设计的Mo中间层可以通过将最大残余应力从Si3N4转移到316L基体上，从而降低接头中Si3N4基体的残余应力。由于Ag的屈服强度较低，焊缝中Ag基固溶体的形成可以进一步降低Si3N4的最大残余应力。最终，Si3N4在接头中的最大残余应力显着降低。此外，还详细研究了Si3N4/316L接头的显微组织和腐蚀行为。当Mo/Ag作为复合中间层插入焊缝时，腐蚀机制由富Cu相的点蚀转变为316L和Mo的均匀腐蚀，从而提高了Si3N4/316L接头的耐腐蚀性能。
In this study, Mo interlayer of different shapes were designed for relieving the residual stress in a Si3N4/316L joint by finite element model simulation. It was found that the Mo interlayer designed by half-cylindrical slotting could reduce the residual stress of Si3N4substrate in the joint by shifting the maximum residual stress from Si3N4to the 316L substrate. The formation of Ag based solid solution in the seam could further reduce the maximum residual stress of Si3N4due to the low yield strength of Ag. Ultimately, the maximum residual stress of Si3N4in the joint was decreased significantly. Furthermore, the microstructure and corrosion behavior of the Si3N4/316L joint were also studied in detail. When Mo/Ag was inserted into the seam as a composite interlayer, the corrosion resistance of the Si3N4/316L joint was improved by the change in corrosion mechanism from pitting of Cu-rich phase to the uniform corrosion of both 316L and Mo.
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