Effect of laser shock peening on the thermal stability of the microstructure of DD6 nickel-based single-crystal superalloy

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-07-12 DOI:10.1016/j.optlastec.2025.113560

Tai-Li Chen , Fan Niu , Yu-Chun Wu , Jing Ni , Ze-Fei Zhu , Xiu-Yang Fang , Zhen-Bing Cai

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Abstract

The property degradation and structural evolution of DD6 Nickel-based single crystal superalloy (NSCS) at elevated temperatures after laser shock peening (LSP) were investigated. Both untreated and LSP-treated specimens underwent heat treatment at various temperatures and holding times, and the evolution of their surface microstructures was comparatively analysed. The results showed that the roughness and hardness of the LSP-treated specimens decreased with increasing heat treatment temperature and duration, whereas those of the untreated specimens increased under the same conditions. The oxide film formed on the LSP-treated specimens was relatively thinner than that on the untreated ones. The outward diffusion of Al from the matrix led to the dissolution of the γ′ phase and the formation of γ′-free zones. The high-density dislocations introduced by LSP promoted the formation of a protective Al₂O₃ oxide film, while the residual compressive stress field inhibited oxide film spallation. Overall, LSP effectively enhanced the high-temperature oxidation resistance of NSCS, providing insights into the initial oxidation mechanism of this alloy.

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激光冲击强化对DD6镍基单晶高温合金显微组织热稳定性的影响

研究了DD6镍基单晶高温合金（NSCS）在激光冲击强化（LSP）后高温下的性能退化和组织演变。在不同温度和保温时间下，对未处理和lsp处理的试样进行热处理，对比分析其表面显微组织的演变。结果表明：随着热处理温度和时间的增加，经过lsp处理的试样的粗糙度和硬度降低，而在相同条件下，未经lsp处理的试样的粗糙度和硬度增加；与未处理的试样相比，处理后的试样表面氧化膜相对较薄。Al从基体向外扩散导致γ′相溶解，形成无γ′区。LSP引入的高密度位错促进了Al2O3氧化膜的形成，而残余压应力场抑制了氧化膜的剥落。综上所述，LSP有效增强了NSCS的高温抗氧化性，为该合金的初始氧化机制提供了新的思路。

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

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems