Hydrogen-assisted fracture features of a high strength ferrite-pearlite steel

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英文篇名：Hydrogen-assisted fracture features of a high strength ferrite-pearlite steel 作者：Yuefeng ; Jiang ; Bo ; Zhang ; Dongying ; Wang ; Yu ; Zhou ; Jianqiu ; Wang ; En-Hou ; Han ; Wei ; Ke 英文作者：Yuefeng Jiang;Bo Zhang;Dongying Wang;Yu Zhou;Jianqiu Wang;En-Hou Han;Wei Ke;CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences;School of Materials Science and Engineering,University of Science and Technology of China;Shenyang Blower Works Group Corporation; 英文关键词：Ferrite-pearlite steel;;TEM;;Fracture;;Hydrogen embrittlement 中文刊名：CLKJ 英文刊名：材料科学技术(英文版) 机构：CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences;School of Materials Science and Engineering,University of Science and Technology of China;Shenyang Blower Works Group Corporation; 出版日期：2019-06-15 出版单位：Journal of Materials Science & Technology 年：2019 期：v.35 基金：financially supported by the Joint Funds of the National Natural Science Foundation of China(Grant No.U1608257) 语种：英文; 页：CLKJ201906016 页数：7 CN：06 ISSN：21-1315/TG 分类号：127-133

摘要

Up to now, the exact reason of hydrogen-induced fracture for ferrite-pearlite(FP) steel is still not fully understood. This study presents detail observations of the feature beneath the fracture surface with the aim to reveal the hydrogen-induced cracking initiation and propagation processes. Slow strain rate tensile(SSRT) testing shows that the FP steel is sensitive to hydrogen embrittlement(HE). Focused ion beam(FIB)was used to prepare samples for TEM observations after HE fracture. The corresponding fractographic morphologies of hydrogen charged specimen exhibit intergranular(IG) and quasi-cleavage(QC) fracture feature. Pearlite colony, ferrite/pearlite(F/P) boundary and the adjacent ferrite matrix are found to be responsible for the initial HE fracture and the subsequent propagation. With increasing of the stress intensity factor, fracture mode is found to change from mixed IG and QC to entire QC feature which only occurs at the ferrite matrix. No crack is observed at the ferrite/cementite(F/C) interface. This may be mainly due to the limited pearlite lamella size and relatively low interface energy.
        Up to now, the exact reason of hydrogen-induced fracture for ferrite-pearlite(FP) steel is still not fully understood. This study presents detail observations of the feature beneath the fracture surface with the aim to reveal the hydrogen-induced cracking initiation and propagation processes. Slow strain rate tensile(SSRT) testing shows that the FP steel is sensitive to hydrogen embrittlement(HE). Focused ion beam(FIB)was used to prepare samples for TEM observations after HE fracture. The corresponding fractographic morphologies of hydrogen charged specimen exhibit intergranular(IG) and quasi-cleavage(QC) fracture feature. Pearlite colony, ferrite/pearlite(F/P) boundary and the adjacent ferrite matrix are found to be responsible for the initial HE fracture and the subsequent propagation. With increasing of the stress intensity factor, fracture mode is found to change from mixed IG and QC to entire QC feature which only occurs at the ferrite matrix. No crack is observed at the ferrite/cementite(F/C) interface. This may be mainly due to the limited pearlite lamella size and relatively low interface energy.

引文

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