Enhanced tribological performance of shot peened nickel-based single crystal superalloy with heterogeneous gradient nanostructure at elevated temperature

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2025-08-29 DOI:10.1016/j.wear.2025.206310

Lu Liu , Shouyi Sun , Huitao Chen , Huahui Yi , Min Dou , Zhufeng Yue , Lei Li

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引用次数: 0

Abstract

The dry-sliding wear behaviors of nickel-based single crystal (NBSC) superalloy under different shot peening (SP) intensities and sliding times are investigated and compared with those of non-SP NBSC superalloy. The surface roughness of SP superalloy is 82.9 %–388.1 % higher than that of non-SP superalloy, and the surface microhardness is 8.7 %–50.4 % higher than that of non-SP superalloy. However, at the initial stage of abrasion, due to the large surface roughness, the coefficient of friction (COF) and wear rate of SP superalloy are higher than those of non-SP superalloy. After long-term abrasion, the COF and wear rate of SP superalloy are lower than those of non-SP superalloy, which is attributed to the SP-induced gradient-hardening layer and gradient-nanograined microstructure. Under cyclic friction load, a five-layer heterogeneous gradient nanostructure is generated on the worn surface of SP superalloy, including ultrafine nanograined glaze layer, nanocrystal layer, sub-grain layer, rotated γ′ layer and distorted γ′ layer. While non-SP superalloy has a thicker heterogeneous gradient nanostructure with larger grain sizes, and there is no rotated γ’ layer. SP-induced high-density dislocations strengthen the wear resistance. These findings provide new insights into the strengthening mechanism of SP on wear and highlight the potential of SP in the design of wear-resistant NBSC superalloy.

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非均匀梯度纳米结构喷丸镍基单晶高温合金高温摩擦磨损性能的提高

研究了镍基单晶（NBSC）高温合金在不同喷丸强度和滑动次数下的干滑动磨损行为，并与非喷丸NBSC高温合金进行了比较。SP合金的表面粗糙度比非SP合金高82.9% ~ 388.1%，表面显微硬度比非SP合金高8.7% ~ 50.4%。但在磨损初期，由于表面粗糙度较大，SP高温合金的摩擦系数（COF）和磨损率均高于非SP高温合金。长期磨损后，SP高温合金的COF和磨损率低于非SP高温合金，这是由SP诱导的梯度硬化层和梯度纳米晶组织造成的。在循环摩擦载荷作用下，SP高温合金磨损表面形成五层非均匀梯度纳米结构，包括超细纳米晶釉层、纳米晶层、亚晶层、旋转γ′层和变形γ′层。而非sp合金具有较厚的非均相梯度纳米结构和较大的晶粒尺寸，且不存在旋转的γ′层。sp诱导的高密度位错增强了材料的耐磨性。这些发现为SP对磨损的强化机理提供了新的认识，并突出了SP在耐磨NBSC高温合金设计中的潜力。

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

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.