Microstructural evolutions in dissimilar welds between AISI 310 austenitic stainless steel and Inconel 657
Microstructural evolutions in dissimilar welds between AISI 310 austenitic stainless steel and Inconel 657
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DOI：
10.1007/s10853-010-4227-8
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发表时间：
2010-05-01
影响因子：
4.5
通讯作者：
Ashrafizadeh, F.
中科院分区：
文献类型：
--
作者：
Naffakh, H.;Shamanian, M.;Ashrafizadeh, F.
研究了310型奥氏体不锈钢(SS)与Inconel657高温合金的异种金属焊缝特征。焊接使用四种类型的填充材料：Inconel 82、Inconel A、Inconel 617和310型SS。用光学金相和扫描电子显微镜对焊件进行了详细的表征。由此可见，Inconel A焊缝金属不会促进严重的热裂纹。Inconel82焊缝金属中连续的NbC析出物对焊缝金属的凝固开裂具有敏化作用。Inconel617焊缝金属中Mo含量过高导致了脆性相的形成。此外，310不锈钢焊缝金属中存在连续析出物，导致焊缝金属的抗热裂纹性能较差。在老化条件下，Inconel 82和Inconel A表现出良好的热稳定性，而Inconel 617和310型SS表现出较差的热稳定性。另外，在对Inconel焊缝金属与母材的热影响区和界面进行时效处理后，Inconel657母材一侧的非混合区消失了。这一区域的消除可归因于合金元素的高温互扩散。最后发现，Inconel A和Inconel 82焊缝金属分别是进行异种焊接的最佳选择。
This investigation has been performed to characterize dissimilar metal welds between type 310 austenitic stainless steel (SS) and Inconel 657 superalloy. The welds were produced using four types of filler materials: Inconel 82, Inconel A, Inconel 617, and type 310 SS. The weldments were characterized in detail using optical metallography and scanning electron microscopy. It can be concluded that Inconel A weld metal does not promote severe hot cracking. Continuous NbC precipitates in the Inconel 82 weld metal can sensitize the weld metal to solidification cracking. The presence of high amounts of Mo in Inconel 617 weld metal led to the formation of brittle phases. In addition, continuous precipitates were observed in the 310 SS weld metal, which can lead to poor resistance of the weld metal to hot cracking. In the aged condition, Inconel 82 and Inconel A exhibited good thermal stability, whereas Inconel 617 and type 310 SS exhibited poor thermal stability. Also, after subjecting the heat-affected zone and interface between Inconel weld metal and base metals to aging treatment, unmixed zone of Inconel 657 base metal side has disappeared. Elimination of this region can be attributed to high-temperature interdiffusion of alloying elements. Finally, it is found that Inconel A and Inconel 82 weld metals are the best choices for the dissimilar welds performed here, respectively.