Cause analysis and improvement measures of 4140 steel curved shell

doi:10.13251/j.issn.0254-6051.2020.09.045

Abstract

Abstract: More fractures happened in the 4140 steel curved shellproduced by a drlling tool factory.The reason for fracture of the failed curved shell was studied by analysis of chemical composition,mechanical properties and microstructure,and the heat treatment process was optimized accordingly.The results show that the fracture of the failed curved shell is caused mainly by incomplete quenching,which results into a large quantity of strip ferrite and block ferrite in the microstructure and poor strength,hardness and impact toughness of the material.By adopting the optimized quenching process,the material life reaches the normal level.

Key words: 4140 steel, fracture cause, mechanical properties, microstructure

CLC Number:

TG162.84

Wang Jinyong, Qi Xilun, Cao Hongbo. Cause analysis and improvement measures of 4140 steel curved shell[J]. Heat Treatment of Metals, 2020, 45(9): 240-243.

References

[1] 张宇,刘仁东,王科强,等.42CrMo钢动态CCT曲线及组织转变[J].金属热处理,2012,37(12):37-39.
Zhang Yu,Liu Rendong,Wang Keqiang,et al.Dynamic continuous cooling transformation curves and microstructure evolution of 42CrMo steel[J].Heat Treatment of Metals,2012,37(12):37-39.
[2] 肖洋,王刚.42CrMo钢退火工艺的优化研究[J].金属世界,2016(3):32-34.
Xiao Yang,Wang Gang.Study on optimization of annealing process of 42CrMo steel[J].Metal World,2016(3):32-34.
[3] 周同,索进平.42CrMo钢连杆失效分析[J].化学工程与装备,2016(4):21-24.
Zhou Tong,Suo Jinping.Failure analysis of 42CrMo steel connecting rod[J].Chemical Engineering and Equipment,2016(4):21-24.
[4] 郝震宇,汪开忠,胡芳忠,等.淬火介质对不同规格42CrMo钢组织及性能的影响[J].安徽冶金,2016(4):15-19.
Hao Zhenyu,Wang Kaizhong,Hu Fangzhong,et al.Effect of quenching medium on microstructure and mechanical properties of 42CrMo steel of different specifications[J].Anhui Metallurgy,2016(4):15-19.
[5] 蔡笑樱.42CrMo4大型锻件显微组织对低温冲击性能的影响[D].济南:山东大学,2018.
Cai Xiaoying.Effect of microstructure of 42CrMo4 heavy forgings on low temperature impact properties[D].Jinan:Shandong University,2018.
[6] 徐佐仁,许国英,郁金星.轴承钢马氏体等温处理的研究[J].上海交通大学学报,1985,19(3):38-50.
Xu Zuoren,Xu Guoying,Yu Jinxing.A study of modified martempering of ball bearing steel[J].Journal of Shanghai Jiao Tong University,1985,19(3):38-50.
[7] 薛贯鲁,刘庆锁,姜训勇.含硅钢上贝氏体组织演变特征研究[J].热加工工艺,2008(24):31-33.
Xue Guanlu,Liu Qingsuo,Jiang Xunyong.Research on microstructure evolution of upper bainite in silicon-containing steel[J].Hot Working Technology,2008(24):31-33.
[8] 文超,董雯,梁会雷,等.42CrMo钢的等温淬火和回火[J].金属热处理,2014,39(12):50-54.
Wen Chao,Dong Wen,Liang Huilei,et al.Isothermal quenching and tempering of 42CrMo steel[J].Heat Treatment of Metals,2014,39(12):50-54.

[1]	Wang Yudai, Liu Yang, Zhu Yanyan, Tian Xiangjun, Cheng Xu, Ran Xianzhe, Qian Tingting. Effect of heat treatment on microstructure homogeneity and tensile properties of hybrid fabricated AerMet100 ultra-high strength steel [J]. Heat Treatment of Metals, 2022, 47(4): 1-9.
[2]	Zhang Ziyan, Chen Jun, Chen Xiaoya, Li Quan'an, Liu Jianxin. Effect of solution and aging treatment on microstructure and corrosion resistance of Mg-4Sm-3Gd-0.5Zr alloy [J]. Heat Treatment of Metals, 2022, 47(4): 10-16.
[3]	Liang Enpu, Xu Le, Yang Yong, Wang Maoqiu. Effects of Al and Cu additions on microstructure and mechanical properties of 40CrNi3MoV steel [J]. Heat Treatment of Metals, 2022, 47(4): 17-23.
[4]	Qi Xiaoliang, Li Yan, Ding Wei, Zhao Zengwu. Effect of original microstructure of medium manganese TRIP steel containing Al on microstructure and mechanical properties after intercritical annealing [J]. Heat Treatment of Metals, 2022, 47(4): 24-29.
[5]	Chen Baoan, Zhang Jingyuan, Zhu Zhixiang, Han Yu, Pan Xuedong, Zhang Lei, Chen Suhong. Effect of chemical composition on microstructure and properties of high strength Al-Mg-Si alloy [J]. Heat Treatment of Metals, 2022, 47(4): 30-38.
[6]	Chen Dongjun, Li Guangyang, Liu Gang. Effect of aging treatment on microstructure and mechanical properties of AlSi9Cu3 HPDC aluminum alloy [J]. Heat Treatment of Metals, 2022, 47(4): 53-56.
[7]	Chen Liansheng, Zhang Luyou, Tian Yaqiang, Yang Zixuan, Li Hongbin, Pan Hongbo, Wei Yingli. CCT curves and microstructure and properties of low-carbon high strength marine steel [J]. Heat Treatment of Metals, 2022, 47(4): 63-68.
[8]	Jia Changyuan, Huo Yuanming, He Tao, Huo Cunlong, Liu Keran. High temperature tensile deformation behavior and microstructure evolution law of 40CrNiMo steel [J]. Heat Treatment of Metals, 2022, 47(4): 69-74.
[9]	Wang Yunlong, Yu Wei, Zhang Yi, Shi Jiaxin, Li Minghui. Effect of austenitizing temperature on isothermal transformation and mechanical properties of bainite steel [J]. Heat Treatment of Metals, 2022, 47(4): 80-85.
[10]	Liu Liyan, Bi Wenzhen, Wei Xicheng. Effect of Mn element on microstructure evolution of galvanized coating of hot stamping steel [J]. Heat Treatment of Metals, 2022, 47(4): 93-99.
[11]	Luo Zaibin, Fan Zize, Peng Zhen. Research progress of light-weight high-entropy alloys [J]. Heat Treatment of Metals, 2022, 47(4): 100-107.
[12]	Fu Xibin, Chen Zihao, Zhang Ke, Zhao Shiyu, Sun Xinjun, Zhu Zhenghai, Liang Xiaokai, Yong Qilong. Effect of quenching temperature on microstructure and mechanical properties of high Ti low alloy wear-resistant steel [J]. Heat Treatment of Metals, 2022, 47(4): 122-127.
[13]	Su Pengji, Ma Yonglin, Dong Lili, Yang Xuefeng. Effect of magnetic field pre-annealing on microstructure and texture of CGO steel [J]. Heat Treatment of Metals, 2022, 47(4): 128-132.
[14]	Li Li, Zeng Yan, Wu Xiaochun. Heat treatment process optimization for 4Cr5Mo2VCo steel [J]. Heat Treatment of Metals, 2022, 47(4): 133-140.
[15]	Lü Jiesheng, Song Zhigang, He Jianguo, Feng Han, Zheng Wenjie, Zhu Yuliang. Microstructure transformation and strengthening-plasticization mechanism of S32205 duplex stainless steel after cold rolling and annealing [J]. Heat Treatment of Metals, 2022, 47(4): 141-145.