Microstructure characteristics of LPBF&HIP fabricated graded composite transition joint between ferritic steel and austenitic stainless steel

IF 11.1 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
Yuying Wen , Shanshan Hu , Youyuan Zhang , Ting Sun , Luke Wadle , Lanh Trinh , Xingru Tan , Susheng Tan , Wei Zhang , Haiyang Qian , Bai Cui , Yanli Wang , Zhili Feng , Xingbo Liu
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Abstract

Graded composite transition joints (GCTJs) offer a promising alternative to conventional dissimilar metal welds (DMWs) by enabling smooth compositional and microstructural transitions. However, GCTJs fabricated solely through additive manufacturing (AM) face challenges such as heat accumulation, complex parameter control, and elemental segregation. In this study, we propose a novel approach that relies on AM to design a spatially graded structure in one alloy and then employs hot isostatic pressing (HIP) as a diffusion bonding method to join it with a second alloy. This method combines the flexibility of AM with the powder net-shaping advantage of HIP. Specifically, a series of closely packed austenitic stainless steel 304 conical structures were printed using laser powder bed fusion (LPBF) and then combined with ferritic steel P91 powder via HIP. By using electron backscatter diffraction (EBSD), electron probe microanalysis (EPMA), and transmission electron microscopy (TEM) techniques, the microstructure characteristics of the GCTJ of 304&P91, especially the interdiffusion zone (IDZ), have been systematically investigated. The microstructure at the interface transitions from austenite-ferrite (A+F) to austenite-martensite-ferrite (A+M+F), and finally to martensite-ferrite (M+F) due to diffusion. Additionally, the diffusion width between 304 and P91 increases with the volume fraction of P91. This unique design also ensures a gradual transition in both hardness and thermal expansion coefficient from 304 to P91, thereby enabling a smooth gradient in functional properties. Overall, this study proposes a novel approach for fabricating GCTJs and contributes to advancing design concepts in the field of dissimilar metal joining.
铁素体钢与奥氏体不锈钢间lbf&hip渐变复合过渡接头的组织特征
梯度复合材料过渡接头(gctj)通过实现光滑的成分和微观结构过渡,为传统的异种金属焊接(dmw)提供了一种有希望的替代方案。然而,仅通过增材制造(AM)制造的gctj面临着热积累、复杂参数控制和元素偏析等挑战。在这项研究中,我们提出了一种新的方法,即依靠增材制造在一种合金中设计空间梯度结构,然后使用热等静压(HIP)作为扩散连接方法将其与另一种合金连接。该方法结合了增材制造的灵活性和HIP的粉末净成型优势。具体而言,采用激光粉末床熔接(LPBF)技术打印出一系列紧密排列的奥氏体不锈钢304锥形结构,然后通过HIP与铁素体钢P91粉末结合。利用电子背散射衍射(EBSD)、电子探针显微分析(EPMA)和透射电子显微镜(TEM)技术,系统研究了304& P91 GCTJ的微观结构特征,特别是扩散区(IDZ)。界面组织由奥氏体-铁素体(A+F)转变为奥氏体-马氏体-铁素体(A+M+F),最后由于扩散作用转变为马氏体-铁素体(M+F)。随着P91体积分数的增加,304和P91之间的扩散宽度增大。这种独特的设计还确保了硬度和热膨胀系数从304到P91的逐渐过渡,从而实现了功能性能的平滑梯度。总之,本研究提出了一种制造gctj的新方法,有助于推进异种金属连接领域的设计理念。
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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