杨庆芬,周根树,张曼茹,王建国,于彦峰

• 1:西安交通大学金属材料强度国家重点实验室
• 2:陕西柴油机重工有限公司

摘要(Abstract)：

针对某QT500-7柴油机缸盖示功阀孔过渡圆角处出现裂纹，通过化学成分、组织、力学性能检测以及断口观察，分析其开裂原因。结果表明：缸盖本体的化学成分及组织均符合技术要求，力学性能部分略低于技术要求。缸盖示功阀孔本体内部的铁素体含量未超过70%,符合技术要求，随着接近受热面外表面，铁素体含量逐渐升高，这是由于在使用过程中珠光体受热分解所致。导致缸盖示功阀孔裂纹形成的主要原因是热疲劳，疲劳裂纹起源于示功阀孔的孔沿，这主要由于该处存在应力集中。

关键词(KeyWords)： QT500-7;柴油机缸盖;示功阀;裂纹;热疲劳

Abstract:

Keywords:

基金项目(Foundation): 西安市轻合金重点实验室(201805064ZD15CG48)

作者(Author): 杨庆芬,周根树,张曼茹,王建国,于彦峰

DOI: 10.13289/j.issn.1009-6264.2021-0573

参考文献(References)：

• [1] 李丽婷，苗伟驰，张国勇.船用柴油机缸盖疲劳破坏有限元分析及改进[J].柴油机，2018,40(2):14-16.LI Li-ting,MIAO Wei-chi,ZHANG Guo-yong.Fea analysis and optimization of fatigue failure for marine diesel engine cylinder head[J].Diesel Engine,2018,40(2):14-16.
• [2] Li Y,Liu J X,Zhong G,et al.Analysis of a diesel engine cylinder head failure caused by casting porosity defects[J].Engineering Failure Analysis,2021,127:105498.
• [3] Fonte M,Reis L,Infante V,et al.Failure analysis of cylinder head studs of a four stroke marine diesel engine[J].Engineering Failure Analysis,2019,101:298-308.
• [4] 马孝威.重载发动机缸盖再制造成型中气孔裂纹的仿真研究[D].沈阳：沈阳工业大学，2020.MA Xiao-wei.Simulation study on porosity and cracks in remanufacturing forming of heavy-duty engine cylinder head[D].Shenyang:Shenyang University of Technology,2020.
• [5] 杨明.柴油机缸盖—缸体的热—机械应力和疲劳分析研究[D].武汉：华中科技大学，2014.YANG Ming.Research of the thermal-mechanical stress and fatigue in diesel engine cylinder head and block[D].Wuhan:Huazhong University of Science and Technology,2014.
• [6] 葛长景.船用柴油机气缸盖多场耦合仿真及参数敏感性分析[D].北京：中国舰船研究院，2020.GE Chang-jing.Multiphysics coupled simulation and parameter sensitivity analysis of marine diesel engine cylinder head[D].Beijing:China Ship Research and Development Academy,2020.
• [7] 朱顺敏，张亚东，郑卫刚.船用柴油机缸盖裂纹分析及触火面激光融覆改善性研究[J].起重运输机械，2014(5):57-60.ZHU Shun-min,ZHANG Ya-dong,ZHENG Wei-gang.Crack analysis of marine diesel engine cylinder head and improvement of laser cladding on contact surface[J].Hoisting and Transporting Machinery,2014(5):57-60.
• [8] 崔向东.船用柴油机气缸盖裂纹分析与预防[J].青岛远洋船员职业学院学报，2017,38(3):5-7.CUI Xiang-dong.The analysis and preventive measures of marine diesel engine cylinder cover crack[J].Journal of Qingdao Ocean Shipping Mariners College,2017,38(3):5-7.
• [9] 董宇.汽轮机高压主汽门螺栓断裂失效分析[J].华电技术，2011,33(7):26-27.DONG Yu.Analysis on fracture failure of bolt in high-pressure main stop valve of steam turbine[J].Integrated Intelligent Energy,2011,33(7):26-27.
• [10] 周永坤，赵先锐，许辉.双金属带锯条疲劳裂纹失效分析[J].金属热处理，2016,41(6):176-179.ZHOU Yong-kun,ZHAO Xian-rui,XU Hui.Failure analysis on fatigue crack of bimetal strip saw blade[J].Heat Treatment of Metals,2016,41(6):176-179.
• [11] 王辉平，陈鼎.粉末高速钢疲劳裂纹萌生与扩展的研究进展[J].粉末冶金技术，2016,34(4):300-309.WANG Hui-ping,CHEN Ding.Research and development of behavior of fatigue crack initiation and propagation of powder metallurgy high speed steels[J].Powder Metallurgy Technology,2016,34(4):300-309.
• [12] 樊凯.齿轮材料疲劳裂纹声发射信号特征建模与分析研究[D].北京：北京理工大学，2016.FAN Kai.The acoustic emission signal feature modeling and analysis of fatigue crack of gear material[D].Beijing:Beijing Institute of Technology,2016.
• [13] 刘山林.复杂应力状态下2A12铝合金疲劳裂纹生长行为的试验研究[D].大连：大连理工大学，2016.LIU Shan-lin.Experimental study on short fatigue crack growth behavior in 2Al2 aluminum alloy under complex stress state[D].Dalian:Dalian University of Technology,2016.
• [14] 李向新，陈律，邓岚，等.含Sc航空7075合金的疲劳裂纹萌生及扩展行为[J].金属热处理，2015,40(12):44-48.LI Xiang-xin,CHEN Lü,DENG Lan,et al.Fatigue crack initiation and propagation behavior of 7075 alloy containing Sc used for aviation[J].Heat Treatment of Metals,2015,40(12):44-48.
• [15] 王新忠.避免螺栓疲劳断裂后的灾难性破坏—— 螺栓的疲劳断裂分析[J].现代零部件，2006(7):70-72.WANG Xin-zhong.Avoiding catastrophic failure of bolt after fatigue fracture-analysis of bolt fatigue fracture[J].Modern Parts,2006(7):70-72.
• [16] 周雪凯，薛冬新，殷玉龙，等.某柴油机气缸盖热机耦合强度分析[J].内燃机与配件，2017(3):37-39.ZHOU Xue-kai,XUE Dong-xin,YIN Yu-long,et al.Thermo-mechanical coupling strength analysis of diesel engine cylinder head[J].Internal Combustion Engine and Parts,2017(3):37-39.
• [17] 刘振兴，项盼盼，魏涛，等.某柴油发动机缸盖热机疲劳分析[J].南方农机，2021,52(24):148-149.LIU Zhen-xing,XIANG Pan-pan,WEI Tao,et al.Fatigue analysis of diesel engine cylinder head[J].China Southern Agricultural Machinery,2021,52(24):148-149.
• [18] 杨方平.ZAlSi7Mg合金发动机气缸盖疲劳分析[D].沈阳：沈阳理工大学，2020.YANG Fang-ping.Fatigue analysis of ZAlSi7Mg alloy engine cylinder head[D].Shenyang:Shenyang Ligong University,2020.
• [19] 文洋，李鹏，张丽强，等.基于高周疲劳评估技术的某气缸盖改进设计研究[J].内燃机，2019(5):14-17.WEN Yang,LI Peng,ZHANG Li-qiang,et al.Improved design of a cyliander head based on high cycle fatigue assessment technology[J].Internal Combustion Engines,2019(5):14-17.
• [20] 辛花，张自明，卫军朝，等.高承载铸铁气缸盖火力面结构抗疲劳设计[J].机械设计与研究，2018,34(3):145-149.XIN Hua,ZHANG Zi-ming,WEI Jun-zhao,et al.A study on the structure anti-fatigue design for the fire area of the iron casting cylinder under high load[J].Machine Design and Research,2018,34(3):145-149.
• [21] 高超.基于双向流固耦合的柴油机缸盖热机疲劳分析[D].天津：天津大学，2018.GAO Chao.Thermo-mechanical fatigue analysis of a diesel engine cylinder head based on two-way fluid-structure interaction[D].Tianjin:Tianjin University,2018.
• [22] 杨永春，杨婷，石代龙，等.柴油机活塞不同工况下温度场与应力场有限元分析[J].内燃机与动力装置，2018,35(5):26-32.YANG Yong-chun,YANG Ting,SHI Dai-long,et al.Finite element analysis of temperature field and stress field of diesel engine piston under different working conditions[J].Internal Combustion Engine and Powerplant,2018,35(5):26-32.
• [23] 袁先德，位秀雷，庄进彪.某型柴油机活塞热机耦合有限元分析[C]//2016年全国声学设计与演艺建筑工程学术会议论文集，中国江苏苏州，2016:135-140.YUAN Xian-de,WEI Xiu-lei,ZHUANG Jin-biao.Thermal-mechanical coupling finite element analysis of piston of a diesel engine[C]//Proceedings of 2016 National Conference on Acoustic Design and Performance Architectural Engineering,Suzhou,Jiangsu,China,2016:135-140.
• [24] 郑百林，潘琼瑶，王锋，等.柴油机活塞热机耦合三维有限元分析[J].同济大学学报(自然科学版),2006(11):1534-1538.ZHENG Bai-lin,PAN Qiong-yao,WANG Feng,et al.3D finite element metho multi-fields coupling analysis for a diesel engine[J].Journal of Tongji University(Natural Science),2006(11):1534-1538.
• [25] 杨世寿.卧式双缸柴油机缸盖热机耦合研究[D].昆明：昆明理工大学，2011.YANG Shi-shou.Thermal and mechanical coupling of cylinder head of horizontal dual-cylinder diesel engine[D].Kunming:Kunming University of Science and Technology,2011.

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