超声喷丸和激光冲击喷丸对IN738LC合金微观结构和显微硬度的影响

Effect of Ultrasonic Shot Peening and Laser Shock Peening on the Microstructure and Microhardness of IN738LC Alloys.

作者信息

Liu Sijia, Kim Youngdae, Jung Jinesung, Bae Seongguk, Jeong Sungho, Shin Keesam

机构信息

School of Materials Science and Engineering, Changwon National University, Changwon 51140, Republic of Korea.

Power Generation Technology Laboratory, KEPCO Research Institute, Daejeon 34056, Republic of Korea.

出版信息

Materials (Basel). 2023 Feb 22;16(5):1802. doi: 10.3390/ma16051802.

DOI:10.3390/ma16051802

PMID:36902917

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10003774/

Abstract

IN738LC is a conventional-cast Ni-based superalloy intended for power generation and aerospace applications. Typically, ultrasonic shot peening (USP) and laser shock peening (LSP) are utilized to enhance cracking, creep, and fatigue resistance. In this study, the optimal process parameters for USP and LSP were established by observing the microstructure and measuring the microhardness of the near-surface region of IN738LC alloys. The LSP impact region (modification depth) was approximately 2500 μm, which was much higher than the USP impact depth of 600 μm. The observation of the microstructural modification and resulting strengthening mechanism revealed that the build-up of dislocations upon peening with plastic deformation was crucial for alloy strengthening in both methods. In contrast, significant strengthening via γ' shearing was observed only in the USP-treated alloys.

摘要

IN738LC是一种用于发电和航空航天应用的传统铸造镍基高温合金。通常，采用超声喷丸（USP）和激光冲击喷丸（LSP）来提高其抗开裂、抗蠕变和抗疲劳性能。在本研究中，通过观察IN738LC合金近表面区域的微观结构并测量其显微硬度，确定了USP和LSP的最佳工艺参数。LSP的冲击区域（改性深度）约为2500μm，远高于USP的600μm冲击深度。对微观结构改性和由此产生的强化机制的观察表明，两种方法中通过塑性变形喷丸时位错的积累对合金强化至关重要。相比之下，仅在USP处理的合金中观察到通过γ' 剪切实现的显著强化。