Fish-eye fracture analysis of 20Mn2A round chain steel

doi:10.13251/j.issn.0254-6051.2021.04.042

Abstract

Abstract: 20Mn2A round chain steel was fractured in the tensile test after heat treatment of the braided chain, and round or oval platforms were found on most of the fractures. The fracture morphology, microstructure and chemical composition of the round chain were analyzed by scanning electron microscope, metallographic microscope and direct reading spectrometer. The results show that the chemical composition of the round chain steel is normal, and the microstructure of the round chain is tempered martensite and ferrite. The existence of ferrite reduces the hardness and wear resistance of the round chain steel. The micromorphology of the round platform on the steel fracture is crystal sugar-like intergranular morphology, and there are alumina inclusions on the central surface of the platform. The fish-eye hydrogen embrittlement with inclusions as the core is the main cause of the round chain fracture.

Key words: 20Mn2A steel, round chain, fish eye, hydrogen embrittlement

CLC Number:

TG115.21

Wen Juan, Lai Ping, Yang Rongguang, Ren Qun, Ju Xinhua. Fish-eye fracture analysis of 20Mn2A round chain steel[J]. Heat Treatment of Metals, 2021, 46(4): 224-226.

References

[1] 杨捷,范银平,何晓波.圆环链用20Mn2A热轧盘条的研制与开发[J].金属制品,2010,36(3):55-57.
Yang Jie,Fan Yinping,He Xiaobo.Research and development of 20Mn2A hot rolled wire rod for ring chain[J].Metal Products,2010,36(3):55-57.
[2] 叶圣渊,方振麟,权淑丽,等.ML20MnTiB高强度螺栓头部开裂原因分析[J].理化检验-物理分册,2009,45(S1):80-81.
Ye Shengyuan,Fang Zhenlin,Quan shuli,et al.Cracking reason of the head of ML20MnTiB high-strength bolt[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2009,45(S1):80-81.
[3] 彭文杰,薛欢,张彦文,等.一种高强汽车弹簧用钢的超高周疲劳研究[J].武汉工程职业技术学院学报,2016,28(3):1-5.
Peng Wenjie,Xue Huan,Zhang Yanwen,et al.Very high cycle fatigue behavior of automotive spring steel[J].Journal of Wuhan Engineering Institute,2016,28(3):1-5.
[4] 曹重,赵征宇,李江华,等.热轧带肋钢筋的拉伸断口分析[J].金属热处理,2015,40(10):214-216.Cao Chong,Zhao Zhengyu,Li Jianghua,et al.Tension fracture of hot rolled ribbed bar[J].Heat Treatment of Metals,2015,40(10):214-216.
[5] 隋然.白点及其检验[J].理化检验-物理分册,1997,33(12):25-27.
[6] 宁玫,张冰,张志远,等.氢损伤缺陷分析研究[C]//第八届(2011)中国钢铁年会论文集.2011:3713-3718.
Ning Mei,Zhang Bing,Zhang Zhiyuan,et al.Analysis and research of hydrogen damage defects[C]//Proceedings of the 8th (2011) China Iron and Steel Annual Meeting.2011:3713-3718.
[7] 董凤奎,丘先堂,廖美华,等.Q235B圆钢拉伸性能异常原因分析[J].河南冶金,2018,26(5):29-31.
Dong Fengkui,Qiu Xiantang,Liao Meihua,et al.Analysis of the abnormal tensile properties of Q235B round steel[J].Henan Metallurgy,2018,26(5):29-31.
[8] 吴文炳,王国琦,张孝彬,等.鱼眼白点的形成机制[J].浙江大学学报,1986,20(3):105-110.
Wu Wenbing,Wang Guoqi,Zhang Xiaobin,et al.Investigation on the Formation mechanism of fish-eye flakes[J].Journal of Zhejiang University,1986,20(3):105-110.
[9] 李欣.35A电机轴撕裂性白点的微观形貌[J].大型铸锻件,1984(1):54-56.
[10] 朱伟华,翟正龙.45钢拉伸试样氢脆断裂分析[J].莱钢科技,2006(6):42-43.
Zhu Weihua,Zhai Zhenglong.Analysis of hydrogen-induced brittle fracture in tensile samples of the 45 steel[J].Laigang Science Technology,2006(6):42-43.

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[2]	Zhang Huiyun, Meng Xianming, Zheng Liuwei, Liang Wei. Effect of sensitization on hydrogen embrittlement sensitivity of 304 austenitic stainless steel in different states [J]. Heat Treatment of Metals, 2021, 46(8): 164-169.
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[7]	Zeng Qiang, Wu Ying, Xiao Huijin, Zhu Shaowei. Hydrogen embrittlement behavior of oilfield-grade Inconel 718 alloy laser welded joint [J]. Heat Treatment of Metals, 2020, 45(8): 50-55.
[8]	Cai Siwei, Hua Tianshun, Zong Yu, Wang Chao, Song Renguo. Effect of voltage on inhibition of hydrogen embrittlement sensitivity of 7050 aluminum alloy by micro arc oxidation film [J]. Heat Treatment of Metals, 2020, 45(11): 89-93.
[9]	Yang Chun1,2, Zhong Zhenqian1, Si Hong1, Xie jinpeng1. Failure analysis of fractured cylinder bolts [J]. HTM, 2016, 41(11): 175-178.
[10]	Zheng Chuanbo, Tang Zhujun, Shen Xiaolan. Effect of microstructure on hydrogen embrittlement of 2205 duplex stainless steel [J]. HTM, 2015, 40(9): 39-44.
[11]	Wang Peng，Liu Kai. Effect of tungsten on properties and susceptibility to hydrogen embrittlement of bainitic steel [J]. HTM, 2015, 40(5): 10-14.
[12]	Zhang Haixia1, Cheng Xiaoying1,2, Li Heng1, Shen Heping1. Effect of tempering temperature on microstructure and hydrogen embrittlement sensibility of a new type mooring chain steel [J]. HTM, 2015, 40(11): 114-119.
[13]	Cao Chong1, Zhao Zhengyu1, Li Jianghua2, Wu Guangyao1, Deng Guanping1, Yang Hui1. Tension fracture of hot rolled ribbed bar [J]. HTM, 2015, 40(10): 214-219.
[14]	Feng Peigong, Cheng Xiaoying, Zhang Haixia. Effect of original austenite grain size on hydrogen embrittlement sensitivity of high-strength low-alloy mooring chain steel [J]. HTM, 2014, 39(11): 20-26.
[15]	Mu Yanjun, Yang Jun, Wen Hanyan. Fracture failure analysis of 30CrMnSiA steel bolts [J]. HTM, 2014, 39(1): 141-143.