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Characterization of M23C6 Carbides Precipitating at Grain Boundaries in 100Mn13 Steel

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Abstract

Characteristics of the formation, the interfacial structure, and the defects of M23C6 carbides in 100Mn13 steel after 1323 K (1050 °C) solution treatment and subsequent aging treatment were investigated by transmission electron microscope (TEM). The results show that M23C6 carbides precipitated on both sides of the grain boundaries. Each M23C6 carbide particle possesses a coherent interface and the cube–cube orientation relationship with the one austenite grain which M23C6 precipitated from. The orientation relationships between the M23C6 carbides and the austenite matrix were determined as follows: (1) [211]γ \( \parallel \)[211]M23C6, (\( 1\bar{1}\bar{1} \))γ \( \parallel \)(\( 1\bar{1}\bar{1} \))M23C6, (02\( \bar{2} \))γ \( \parallel \)(02\( \bar{2} \))M23C6, (2) [110]γ \( \parallel \)[110]M23C6, (\( \bar{1}1\bar{1} \))γ \( \parallel \)(\( \bar{1}1\bar{1} \))M23C6, (\( \bar{1} \)11)γ \( \parallel \)(\( \bar{1} \)11)M23C6. The M23C6 carbide also possesses an incoherent interface with the other austenite grain which the M23C6 carbide grew into by ledge mechanism. The precipitation of the M23C6 carbides along the boundaries can improve the hardness of the high-manganese steel to some extent. Besides, twinning and stacking faults were observed in M23C6 carbides. The reports about twinning and stacking faults in the M23C6 carbides have not been found.

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Acknowledgments

The authors are grateful to Professor Zhiquan LIU and Dr. Shuang GAO of Institute of Metal Research, Chinese Academy of Sciences, for valuable guidance and assistance in this work. This work was supported by the Program for Liaoning Excellent Talents in University within the Project No. LR2012014, the Technology Promotion Program from the Ministry of Railway of China within the Project No. 2012G011-D, and Science and Technology Project of Dalian within the Project No. 2013A16GX119.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, Liaoning, 116028, China

    Zhenfeng Xu (Doctor) & Zhimin Ding (Professor)

  2. Hunan Aerospace Precision Machinery Co. LTD, Changsha, Hunan, 410205, China

    Linnan Dong (Engineer)

  3. Dalian Locomotive and Rolling Stock Co., Ltd. Cnr Group, Dalian, Liaoning, 116028, China

    Bo Liang (Engineer)

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  1. Zhenfeng Xu
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  2. Zhimin Ding
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  3. Linnan Dong
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Correspondence to Zhimin Ding.

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Manuscript submitted November 19, 2015.

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Xu, Z., Ding, Z., Dong, L. et al. Characterization of M23C6 Carbides Precipitating at Grain Boundaries in 100Mn13 Steel. Metall Mater Trans A 47, 4862–4868 (2016). https://doi.org/10.1007/s11661-016-3656-7

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