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。
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℃,820 MPa 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.
作者
肖值兴
毛建兴
胡殿印
王欣
王荣桥
XIAO Zhi-xing;MAO Jian-xing;HU Dian-yin;WANG Xin;WANG Rong-qiao(School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;Research Institute of Aero-Engine,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;Beijing Key Laboratory of Aero-Engine Structure and Strength,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;Surface Engineering Institution,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
出处
《推进技术》
EI
CAS
CSCD
北大核心
2022年第2期61-67,共7页
Journal of Propulsion Technology
基金
国家自然科学基金(51675024
52022007)
国家科技重大专项(2017-Ⅳ-0004-0041)。
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
Hole structure
Expansion strengthening
Nickel-based superalloy
Numerical simulation
Process parameters
Low cycle fatigue life
