孔挤压强化工艺参数对<bold>GH4169</bold>高温合金疲劳寿命影响分析

肖值兴; 毛建兴; 胡殿印; 王欣; 王荣桥

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孔挤压强化工艺参数对GH4169高温合金疲劳寿命影响分析
肖值兴¹，毛建兴²，胡殿印^2,3，王欣⁴，王荣桥^1,2,3
1.北京航空航天大学能源与动力工程学院，北京 100191;2.北京航空航天大学航空发动机研究院，北京 100191;3.北京航空航天大学航空发动机结构强度北京市重点实验室，北京 100191;4.中国航发北京航空材料研究院表面工程研究所，北京 100095

摘要:

为探究孔挤压强化工艺参数对镍基高温合金GH4169低周疲劳寿命的影响规律，首先建立了经试验验证的孔挤压强化后GH4169带孔平板低周疲劳寿命模型，在此基础上研究了600℃、820MPa、应力比0.1条件下挤压量、前导角、后导角、摩擦因数、芯棒材料等典型工艺参数对孔挤压强化后疲劳寿命的影响规律。结果表明：提高挤压量能明显提升疲劳寿命，但过大的挤压量会导致疲劳寿命下降；增加前导角有助于改善挤入面疲劳寿命；后导角对疲劳寿命没有影响；摩擦因数的提高会对孔挤压强化效益产生负面影响；芯棒材料的屈服强度应大于被挤压材料。

关键词: 孔结构挤压强化镍基高温合金数值模拟工艺参数低周疲劳寿命

DOI：10.13675/j.cnki.tjjs.210502

分类号:V231.1

基金项目:国家自然科学基金（51675024；52022007）；国家科技重大专项（2017-IV-0004-0041）。

Effects of Cold Expansion Process Parameters on Fatigue Life of GH4169 Superalloy

XIAO Zhi-xing¹, MAO Jian-xing², HU Dian-yin^2,3, WANG Xin⁴, WANG Rong-qiao^1,2,3

1.School of Energy and Power Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100191，China;2.Research Institute of Aero-Engine，Beijing University of Aeronautics and Astronautics，Beijing 100191，China;3.Beijing Key Laboratory of Aero-Engine Structure and Strength，Beijing University of Aeronautics and Astronautics， Beijing 100191，China;4.Surface Engineering Institution，AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China

Abstract:

In order to explore the influence of cold expansion process parameters on the fatigue life of nickel base superalloy GH4169， a low cycle fatigue life prediction model of GH4169 perforated plate after cold expansion was established， and its accuracy was verified by experiments. On this basis， five process parameters including interference value， front chamfer， back chamfer， friction coefficient and mandrel material were systematically studied under the conditions of 600℃， 820MPa and stress ratio of 0.1. The results show that increasing interference value can significantly improve the fatigue life， but too large interference value will lead to over extrusion. Increasing the front chamfer properly can help to improve the fatigue life of the extrusion surface. The back chamfer has little effect on the fatigue life. The increase of friction coefficient will have a negative impact on the strengthening benefit of cold expansion. The yield strength of mandrel material should be greater than that of extruded material.

Key words: Hole structure Expansion strengthening Nickel-based superalloy Numerical simulation Process parameters Low cycle fatigue life