电子束三维打印 DZ125 镍基超合金的裂纹机理

Z Wang, Y Lin, Y Zhao, F Shangguan, K Chen
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引用次数: 0

摘要

定向凝固镍基超合金具有出色的高温机械性能,因此被广泛用于制造涡轮叶片。为了降低总体成本,人们对修复技术的要求很高,以恢复受损涡轮叶片的形状和性能。本研究采用电子束粉末床熔融三维打印方法,在化学成分相同的基体金属上外延生长 DZ125 Ni 基超合金,作为修复过程的替代物。在打印部件中发现了裂纹,这些裂纹总是沿着高角度晶界出现,并与构建方向大致平行。这些裂纹被确定为液化裂纹,热循环效应被证明在裂纹的产生和扩展中发挥了重要作用。从这项工作中获得的知识为三维打印策略的开发提供了宝贵的见解,从而获得无裂纹定向凝固超合金。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cracking Mechanism in E-Beam 3D-Printed DZ125 Ni-based Superalloys
Directionally solidified Ni-based superalloys are extensively employed to manufacture turbine blades due to their outstanding high-temperature mechanical properties. To reduce overall costs, repairing techniques are highly demanded to restored the shape and properties of damaged turbine blades. In this study, as a surrogate for the repair process, DZ125 Ni-based superalloys were grown epitaxially with the electron beam powder bed fusion 3D-printing method on a base metal with the same chemical composition. Cracks are detected within the printed part, always along the high-angle grain boundaries and roughly parallel to the building direction. The cracks are identified to be liquation cracks, and the thermal cycling effects are proved to play an important role in crack initiation and propagation. The knowledge gained from this work provides valuable insights towards 3D-printing strategy development to obtain crack-free directionally solidified superalloys.
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