Mathematical modeling and optimization of vacuum diffusion bonding parameters for predicting and enhancing the strength of dissimilar IN-718/MSS-410 joints using RSM for power generation applications

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Arun Negemiya , Selvarajan Rajakumar , Tushar Sonar , Mikhail Ivanov
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Abstract

The dissimilar welding of Inconel 718 (IN-718) alloy and AISI 410 martensitic stainless steel (MSS-410) is crucial in advanced gas turbines, and ultra-supercritical power plants to meet the demands of different operating conditions and lower the cost. However, the dissimilar fusion welding of IN-718/MSS-410 is challenging due to the differences in thermal expansion coefficient, physical and mechanical properties of base metals. In this study, the solid-state vacuum diffusion bonding (VDB) technology is employed to develop the dissimilar IN-718/MSS-410 joints. The aim of this study is to find the optimal combination of VDB parameters such as diffusion bonding pressure-DBP (MPa), diffusion bonding temperature-DBT (°C) and diffusion bonding time-DBt (min) for enhancing the strength of IN-718/MSS-410 joints. The response surface methodology (RSM) was integrated for designing the experimental matrix. The strength performance of VDB joints was evaluated by conducting the lap shear strength (LSS) and bonding strength (BS) tests. The mathematical LSS and BS predicting models were established using regression analysis and verified employing the variance analysis. The microstructural features were analyzed using optical and scanning electron microscopy (SEM). The X-ray diffractometer (XRD) was employed to identify the phases evolution in the joint interface. The experimental results revealed that the IN-718/MSS-410 joints diffusion bonded using the DBP of 14 MPa, DBT of 960 °C and DBt of 90 min exhibited the greater LSS of 280 MPa and BS of 373 MPa. The prediction models accurately predicted the LSS and BS of IN-718/MSS-410 joints within 2 % error at 95 % confidence. It is primarily concerned with developing the optimal bonding width with the fewest possible embrittlement implications and better joining interface coalescence. According to variance analysis, the DBt was the most significant parameter influencing the LSS and BS of joints followed by the DBP and DBT.

利用 RSM 建立数学模型并优化真空扩散接合参数,以预测和提高发电应用中不同 IN-718/MSS-410 接头的强度
Inconel 718 (IN-718) 合金和 AISI 410 马氏体不锈钢 (MSS-410) 的异种焊接在先进的燃气轮机和超超临界发电厂中至关重要,可满足不同运行条件的要求并降低成本。然而,由于基本金属的热膨胀系数、物理和机械性能不同,IN-718/MSS-410 的异种熔焊具有挑战性。本研究采用固态真空扩散焊接 (VDB) 技术来开发 IN-718/MSS-410 异种接头。本研究的目的是找到 VDB 参数的最佳组合,如扩散键合压力-DBP(兆帕)、扩散键合温度-DBT(摄氏度)和扩散键合时间-DBt(分钟),以提高 IN-718/MSS-410 接头的强度。在设计实验矩阵时采用了响应面方法(RSM)。通过进行搭接剪切强度(LSS)和粘合强度(BS)测试,评估了 VDB 接头的强度性能。利用回归分析建立了 LSS 和 BS 预测数学模型,并利用方差分析进行了验证。使用光学显微镜和扫描电子显微镜分析了微观结构特征。利用 X 射线衍射仪(XRD)确定了接合界面中的相变。实验结果表明,在 DBP 为 14 MPa、DBT 为 960 °C 和 DBt 为 90 min 的条件下扩散粘接的 IN-718/MSS-410 接头的 LSS 为 280 MPa,BS 为 373 MPa。预测模型准确预测了 IN-718/MSS-410 接头的 LSS 和 BS,在 95% 置信度下误差在 2% 以内。它主要关注的是开发最佳的粘接宽度,使脆化影响最小,并改善接合界面的凝聚。根据方差分析,DBt 是对接头 LSS 和 BS 影响最大的参数,其次是 DBP 和 DBT。
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
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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