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首页> 外文期刊>Journal of nuclear engineering and radiation science >Ni Interlayer to Improve Low-Pressure Diffusion Bonding of 316L SS Press Fit Tube-to-Tubesheet Joints for Coiled Tube Gas Heaters
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Ni Interlayer to Improve Low-Pressure Diffusion Bonding of 316L SS Press Fit Tube-to-Tubesheet Joints for Coiled Tube Gas Heaters

机译：NI夹层改善316L SS的低压扩散键合，按压卷材加热器的配合管 - 管板接头

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摘要

This study suggests a new approach to diffusion bonding (DB) 316L stainless steel: a low-pressure procedure that includes a nickel interlayer. In this approach, relatively lower pressure is applied to the sample before the DB process, in contrast to the usual approach in which higher pressure is applied during the DB process. This new procedure was tested on mock-up 316L stainless steel tube-to-tubesheet joints, which simulated similar joints in coiled-tube heat-exchanger applications. This study confirms that the new procedure meets the overall success criteria, namely, a pull-out force exceeding the force required for tube rupture. It also shows that the DB joint is improved by the use of a Ni interlayer; the joint strength increased by approximately 33% for a 0.25 μm Ni interlayer and by approximately 18% for a 5 μm Ni interlayer. The joint cross sections were qualitatively examined using optical microscopy (OM) and scanning electron microscopy (SEM); the observations suggest that only portions of the interface were diffusion bonded, as a result of the low-pressure procedure and the surface roughness (due to the sample fabrication). The portions that were diffusion bonded, though, were sound, as characterized by the fact that the steel grains grew through the interface line to create a continuous metallographic structure.
机译：本研究表明了一种新的扩散键合方法（DB）316L不锈钢：低压程序，包括镍层间。在这种方法中，与在DB过程中施加较高压力的常用方法相比，将相对较低的压力施加到样品。在模拟316L不锈钢管 - 管道关节上测试了这种新程序，该接头模拟了卷轴热交换器应用中的类似接头。本研究证实新程序符合总体成功标准，即超出管破裂所需的力的拉出力。它还表明，通过使用Ni中间层改善DB关节;对于0.25μm的Ni中间层，接合强度增加约33％，对于5μm，蛋白质中间层的约18％。使用光学显微镜（OM）和扫描电子显微镜（SEM）定性检查接合横截面;观察结果表明，由于低压程序和表面粗糙度（由于样品制造而），界面的仅部分是扩散键合的。但是，粘合的部分是声音，其特征在于钢粒通过界面线而产生连续的金相结构。

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