Preventing microcracks between directed energy deposited Hastelloy X and IN792 substrate by adding IN625 buffer layer

IF 11.1 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
Ye Chan Sung , Beom Jun Kim , Gideok Park , Seong-Moon Seo , Hyungsoo Lee , Hyoung Seop Kim , Jung Gi Kim
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引用次数: 0

Abstract

Recently, laser-based additive manufacturing (AM) has emerged as a promising method for repairing complex-shaped components. Although small heat-affected zones and high degrees of freedom expand the processing window for AM, microcrack initiation can occur depending on the combination of parent materials. In particular, frequent microcracking has been observed in additively manufactured Hastelloy X (HX) despite its extensive use in hot components for gas turbine systems. To mitigate this issue, Inconel (IN) 625 was deposited as a buffer layer before the deposition of HX to prevent elemental diffusion between HX and IN792 substrate. Consequently, the IN625 buffer layer reduced the W migration from the IN792 substrate to the HX deposit layer, suppressing segregation at the grain boundaries. In addition, the enhanced Nb content in the HX deposit layer, owing to the high Nb content in the IN625 buffer layer, stabilized the primary carbides in the interdendritic region. By combining these two effects, microcracking was suppressed when the IN625 buffer layer was placed between the IN792 substrate and the HX deposit layer. The suppression of microcracks near the interface delayed crack initiation and propagation during tensile tests, resulting in greater elongation with the IN625 buffer layer compared to the specimens without it. This finding highlights the critical role of selecting the deposit layers in influencing microcrack initiation in partially repaired components, suggesting that designing a sequence of deposit layers can be an effective strategy for AM without extensive alloying modifications for additive manufacturing.
通过添加IN625缓冲层防止定向能沉积哈氏合金X与IN792衬底之间的微裂纹
近年来,基于激光的增材制造(AM)已成为修复复杂形状部件的一种有前途的方法。虽然小的热影响区和高自由度扩大了增材制造的加工窗口,但微裂纹的发生取决于母材的组合。特别是,尽管哈氏合金广泛用于燃气轮机系统的热部件,但在增材制造的哈氏合金X (HX)中观察到频繁的微裂纹。为了缓解这一问题,在HX沉积之前沉积Inconel (IN) 625作为缓冲层,以防止元素在HX和IN792衬底之间扩散。因此,IN625缓冲层减少了W从IN792基体向HX沉积层的迁移,抑制了晶界的偏析。此外,由于IN625缓冲层中Nb含量高,使得HX沉积层中Nb含量增加,从而稳定了枝晶间区域的初生碳化物。结合这两种作用,当在IN792衬底和HX沉积层之间放置IN625缓冲层时,微裂纹被抑制。在拉伸试验中,界面附近微裂纹的抑制延迟了裂纹的萌生和扩展,与没有IN625缓冲层的试样相比,有IN625缓冲层的试样伸长率更高。这一发现强调了选择沉积层在影响部分修复部件微裂纹起裂方面的关键作用,表明设计沉积层序列可以成为增材制造中无需大量合金改性的增材制造的有效策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Additive manufacturing
Additive manufacturing Materials Science-General Materials Science
CiteScore
19.80
自引率
12.70%
发文量
648
审稿时长
35 days
期刊介绍: Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.
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