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Investigation of hydrogen embrittlement in 12Cr2Mo1R(H) steel

Published online by Cambridge University Press:  24 September 2018

Xiaowei Luo ,
Bin Bian ,
Kun Zhang ,
Danlei Tian ,
Min Pan ,
Xiaolang Chen  and
Heming Zhao
Xiaowei Luo
Affiliation:
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, People’s Republic of China
Bin Bian
Affiliation:
Department of Mechanical and Materials Engineering, The University of Western Ontario, London, ON N6A 3K7, Canada
Kun Zhang*
Affiliation:
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, People’s Republic of China
Danlei Tian
Affiliation:
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, People’s Republic of China
Min Pan
Affiliation:
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, People’s Republic of China
Xiaolang Chen
Affiliation:
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, People’s Republic of China
Heming Zhao
Affiliation:
Center of Technology, Xinyu Iron and Steel Group Co. Ltd., Xinyu 338001, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: zhangkun_2000@163.com, zhangkun@swjtu.edu.cn
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Abstract

The hydrogen embrittlement of 12Cr2Mo1R(H) steel at different strain rates were investigated after hydrogen precharging for 4 h in a 0.5 M H2SO4 solution with 2 g/L ammonium thiocyanate. Results showed that the embrittlement index increased and gradually reached a relative stable value of about 20% at the strain rate of 5 × 10−5 s−1 with the decrease of strain rates. SEM images depicted small and deep flakes at high strain rates, while flakes grew larger at slow strain rates. Most hydrogen-induced cracks (HICs) were transgranular fracture through lath grain of bainitic ferrite. High strain field surrounds the crack tips, which makes the crack tips of two close and parallel cracks deflect toward each another and even form crack coalescence. The electron backscatter diffraction technique was used to investigate the effects of grain boundaries, recrystallization fraction, kernel average misorientation map, texture component, and coincidence site lattice boundaries on the HIC propagation. High densities of dislocations and strain concentrations were found around the cracks, where grains are highly sensitive to HIC.

Keywords

hydrogen embrittlementhydrogen-chargingelectron backscatter diffractionKAMgrain boundary
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3501 - 3511
Copyright
Copyright © Materials Research Society 2018 

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