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首页> 外文期刊>Journal of Manufacturing Processes >The effect of bonding time on the microstructure and mechanical properties of dissimilar transient liquid phase bonding between UNS N08825 alloy and UNS S32750 super duplex stainless steel using the BNi-2 interlayer
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The effect of bonding time on the microstructure and mechanical properties of dissimilar transient liquid phase bonding between UNS N08825 alloy and UNS S32750 super duplex stainless steel using the BNi-2 interlayer

机译：使用BNI-2中间层，粘合时间对非N08825合金与UNS S32750超双相不锈钢不同瞬态相结合的微观结构和力学性能的影响

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摘要

In this study, the microstructure and mechanical properties of transient liquid phase, dissimilar joints between UNS N08825 alloy and UNS S32750super duplex stainless steel was investigated. The joining process was carried out at 1050 ?C for 0, 60, 120, and 300 s using an BNi-2 interlayer. The transient liquid phase bonding area was divided into three zones: (i) the isothermal solidification zone which contained ?-Ni solid solution, (ii) the athermal solidification zone which consisted of Ni- and Cr-rich borides and Ni3Si precipitates, (iii) and the diffusion affected zone in which Cr-Ni-Fe-Mo-Cu-rich borides constituents existed. The hard and brittle eutectic compounds in the bonding zone posed deleterious effects on the mechanical properties of the joints. By increasing the holding time, the amount of these detrimental phases in the bonding zone decreased before finally a eutectic-free joint was achieved at the bonding time of 300 s, which was notably low as compared to the previous studies. The joint held for 0 s had the widest a-thermal solidification zone and the highest hardness was measured at the center of it (546 Hv). The average hardness of the diffusion affected zone on the UNS S3750 super duplex stainless steel side was approximately 450 Hv, which was markedly higher than that of the diffusion affected zone on the UNS N08825 side (302 Hv). The joint held for 0 s showed the lowest shear strength (239 MPa), while the maximum shear strength was obtained for the joint with a holding time of 300 s, approximately 487 MPa. Moreover, it was demonstrated that eutectic compounds were the principal cause of the brittle fracture in the joints containing the a-thermal solidification zone, whereas the joint with a complete isothermal solidification experienced a brittle fracture that occurred at the diffusion-affected zone of UNS N08825 alloy.
机译：在本研究中，研究了瞬态液相的微观结构和机械性能，UNS N08825合金与未S32750Super双相不锈钢之间的不同接头。使用BNI-2中间层，在1050℃下进行加入过程，在1050℃下进行0,60,120和300秒。瞬态液相粘合面积分为三个区域：（i）含有α-NI固溶体的等温凝固区，（ii）由富含Ni-和Cr的硼化物和Ni3Si沉淀物组成的接种器凝固区（III ）和存在Cr-Ni-Fe-Mo-Cu-Cu-硼化物成分的扩散受影响区域。粘合区中的硬质和脆性共晶化合物对关节的力学性能带来有害影响。通过增加保持时间，在最后在300秒的键合时间之前在300秒的键合时间之前实现了粘合区中的这些有害阶段的量减少，这与先前的研究相比，该键合时间是显着的。保持0秒的接头具有最宽的A热凝固区，并且在其中心（546HV）测量最高硬度。 UNS S3750超复印不锈钢侧的扩散受影响区的平均硬度约为450HV，显着高于UNS N08825侧（302HV）上的扩散受影响区的HV。保持0 s的接头显示出最低的剪切强度（239mPa），而具有300秒的保持时间为约487MPa的接头获得最大剪切强度。此外，证明了共晶化合物是含有A-热凝固区的关节中脆性断裂的主要原因，而具有完全等温凝固的关节经历了在Unt N08825的扩散影响区发生的脆性骨折合金。

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