Transactions of Materials and Heat Treatment

Title：Analysis and prevention measures of failure fracture for 85Cr18Mo2V steel intake valve

Authors： Yao Lingzhen Chen Wen Deng Yizhong Li Qixin Ni Hongyi Wang Yuanni

Unit： Hunan Tyen Machinery Co. Ltd. University of South China

KeyWords： 85Cr18Mo2V steel intake valve fatigue fracture forging network carbide

ClassificationCode：TG111.91

year,vol(issue):pagenumber：2014,39(5):6-8

Abstract：

The crack morphology was observed and the microstructure was analyzed for the failure fracture produced by 85Cr18Mo2V steel intake door. Combined with actual production, the process test was conducted, the cause and formation mechanism of the crack were found, and the effective prevention and improvement measures were put forward. Experiments show that the main reasons of failure for valve are related to the serious network carbide in fracture tissue, and the forming of the network carbide is closely related by the temperature of valve upsetting. Through reasonable adjusting the parameters to control temperature when blank upsetting，such as secondary voltage, heating time, etc., the serious carbide network can be effectively avoided or reduced, which resulting in avoiding or reducing fracture for valve plate and neck.

Funds：

湖南省衡阳市科技局重点资助项目（2013KJ03）

姚玲珍（1966-），女，大专，工程师

Reference：

［1］张玉波，王海斗，杨大祥，等.85Cr18Mo2V材料断裂进气门的冶金学失效分析[A].2011年全国青年摩擦学与表面工程学术会议论文集[C].北京:中国机械工程学会, 2011.Zhang Yubo, Wang Haidou, Yang Daxiang, et al.Metallurgy failure analysis for an early fracture engine intake valve made by 85Cr18Mo2V[A]. The 2011 National Youth Tribology and Surface Engineering Academic Conference Proceedings[C]. Beijing: Chinese Mechanical Engineering Society, 2011.
［2］毛兆杰，汪荣生.机车柴油机气门的失效分析及对策[J].内燃机车,2008,(5):15-18.Mao Zhaojie, Wang Rongsheng. Failure analysis and countermeasures of locomotive diesel engine exhaust valve[J]. Diesel Locomotives, 2008, (5):15-18.
［3］赵新.内燃机气门的失效原因探析[J].内燃机与动力装置,2006,(3):55-56.Zhao Xin. Discuss of invalidation of I.C.E valve [J].I.C.E & Powerplant, 2006, (3):55-56.
［4］李承辉.190系列燃气发动机气门断裂的原因分析及预防[J].内燃机与动力装置,2012,(1):56-59.Li Chenghui. Cause analysis and preventive measure for serious 190 gas engine valve fracture [J]. I.C.E & Powerplant, 2012, (1):56-59.
［5］肖晓玲，况敏，乐有树.柴油机排气阀盘面断裂的失效分析[J].材料研究与应用,2012,6(4):271-275.Xiao Xiaoling, Kuang Min, Le Youshu. Failure analysis of exhaust valve in diesel engine [J].Materials Research and Application, 2012, 6(4):271-275.

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