Crystallographic feature of hydrogen-related fracture in 2Mn-0.1C ferritic steel
Crystallographic feature of hydrogen-related fracture in 2Mn-0.1C ferritic steel
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DOI：
10.1016/j.ijhydene.2018.05.011
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发表时间：
2018-06-14
影响因子：
7.2
通讯作者：
Tsuji, Nobuhiro
中科院分区：
文献类型：
--
作者：
Okada, Kazuho;Shibata, Akinobu;Tsuji, Nobuhiro
本文研究了具有简单铁素体显微组织的 2Mn-0.1C 钢中氢相关断裂的晶体学特征。我们发现同时充氢会降低机械性能（特别是均匀后伸长率）。同时充氢试样的大部分断裂面（超过90%）呈现出带有锯齿状痕迹的准解理形貌，但没有观察到晶间断裂面。通过使用EBSD进行详细的晶体取向分析，我们发现微裂纹是在铁素体晶界处形成的，并且微裂纹沿着铁素体晶面的{0111}晶面在晶粒内部扩展，导致准解理断裂。氢微打印技术表明，在拉伸载荷下，氢沿着铁素体晶界积累。基于所获得的结果，我们提出{011}面上的断裂是具有BCC相的钢中与氢相关的准解理断裂的固有特征。 (C) 2018 氢能源出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
The present paper investigated crystallographic feature of hydrogen-related fracture in a 2Mn-0.1C steel having a simple ferritic microstructure. We found that the mechanical properties (in particular post-uniform elongation) were degraded by concurrent hydrogen-charging. Most of the fracture surfaces (over 90%) of the concurrently hydrogen-charged specimens showed quasi-cleavage morphologies with serrated markings, but no inter granular fracture surface was observed. Through a detailed crystallographic orientation analysis using EBSD, we have clarified that micro-cracks formed at ferrite grain boundaries and the micro-cracks propagated inside grains along crystallographic {0111} planes of ferrite, leading to the quasi-cleavage fracture. Hydrogen micro-print technique revealed that hydrogen accumulated along ferrite grain boundaries under tensile-loading. On the basis of the obtained results, we propose that the fracture on {011} planes is an intrinsic characteristic of hydrogen-related quasi-cleavage fracture in steels having BCC phases. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.