热机载荷下GH4169G车削-喷丸加工表面完整性的演化机理

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关键词：高温合金GH4169G；车削-喷丸复合加工；服役环境;表面完整性演化中图分类号：V216.8DOI：10.3969/j.issn.1004-132X.2025.04.015 开放科学（资源服务）标识码（OSID）：

Evolution Mechanism of Surface Integrity of GH4169G Turning-shot Peening under Thermal and Mechanical Loads

HE Zhe1LI Jiale1SHI Kaining1FAN Yuchang³HUANG Xinchun²* 1.Key Laboratory of High Performance Manufacturing for Aero Engine（Ministry of Industry and Information Technology），Northwestern Polytechnical University，Xi'an，710072 2.Office of Science and Technology，Northwestern Polytechnical University，Xi'an，710072 3.Zhijian Laboratory，Rocket Force University of Engineering，Xi'an，710025

Abstract： A study of the evolution mechanism of surface integrity of turning-shot peening composite machining under service load conditions was carried out for the nickel-based superalloys GH4169G for aero-engines. The forms of thermal，mechanical，and thermo-mechanical loads on surface integrity were analyzed by simulating thermo-mechanical load tests under service environments. The thermo-mechanical loading model for surface integrity control and the residual stress and microhardness evolution model with cosine function control factor were established. The laws of residual stress relaxation under thermo-mechanical loading and the laws of microhardness changes and surface microstructure changes were mastered. The results provide basic data for mastering the evolution of surface integrity of nickel-based superalloys processed under service environments. The surface integrity control processes were further optimized.

Key words： superalloy GH4169G；combined turning and shot peening；service environment； evolution of surface integrity

0 引言

GH4169是一种沉淀强化镍基高温合金，在650°C 下的屈服强度居变形高温合金首位，具有良好的高温抗辐射、抗氧化和抗腐蚀性，以及较高的高温疲劳强度和断裂塑性及韧性[1-2]。（剩余15629字）