The effect of nanosized (Ti,Mo)C precipitates on hydrogen embrittlement of tempered lath martensitic steel
The effect of nanosized (Ti,Mo)C precipitates on hydrogen embrittlement of tempered lath martensitic steel
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DOI：
10.1016/j.actamat.2014.04.051
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发表时间：
2014-08-01
期刊：
影响因子：
9.4
通讯作者：
Robertson, Ian M.
中科院分区：
文献类型：
--
作者：
Nagao, Akihide;Martin, May L.;Robertson, Ian M.
高强度回火板条马氏体钢中的纳米 (Ti,Mo)C 析出物可提高抗氢脆性。氢致失效模式从不存在 (Ti,Mo)C 析出物时沿着板条和原奥氏体边界的失效转变为存在微孔聚结和板条边界失效的混合失效模式。在没有氢的情况下，无论是否存在 (Ti,Mo)C 沉淀物，都会通过延性微孔聚结发生失效。通过将宏观力学性能、所产生的失效表面的断口分析以及对断裂表面正下方演变的变形结构的观察联系起来，提出了一种氢增强和塑性介导的失效机制，其中纳米级 (Ti,Mo)C 沉淀物的作用是作为氢的有效陷阱。 (C) 2014 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
Nanosized (Ti,Mo)C precipitates in a high-strength tempered lath martensitic steel are shown to increase resistance to hydrogen embrittlement. The hydrogen-induced failure mode transitions from failure along lath and prior austenite boundaries in the absence of the (Ti,Mo)C precipitates to a mixed failure mode of microvoid coalescence and lath boundary failure in their presence. In the absence of hydrogen and regardless of the presence or absence of the (Ti,Mo)C precipitates, failure occurs via ductile microvoid coalescence. By correlating the macroscale mechanical properties, the fractography of the resulting failure surfaces and observation of the evolved deformation structure immediately beneath the fracture surfaces, a hydrogen-enhanced and plasticity-mediated failure mechanism is proposed in which the role of the nanosized (Ti,Mo)C precipitates is to serve as effective traps for hydrogen. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.