孔挤压强化工艺参数对GH4169高温合金疲劳寿命影响分析Effects of Cold Expansion Process Parameters on Fatigue Life of GH4169 Superalloy
肖值兴,毛建兴,胡殿印,王欣,王荣桥
摘要(Abstract):
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(KeyWords): 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
基金项目(Foundation): 国家自然科学基金(51675024;52022007);; 国家科技重大专项(2017-Ⅳ-0004-0041)
作者(Author): 肖值兴,毛建兴,胡殿印,王欣,王荣桥
DOI: 10.13675/j.cnki.tjjs.210502
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