材料工程2017，Vol.45Issue(10)：138-144,7.DOI:10.11868/j.issn.1001-4381.2015.001146
充氢Cr-Mo钢变形过程的声发射特征
Acoustic Emission Characteristics of Hydrogen Charged Cr-Mo Steel During Deformation
摘要
Abstract
Tensile test was conducted on 2.25Cr-1Mo steel specimens that were electrochemically hy-drogen charged and acoustic emission signals were collected in the real-time stretching process.The results show that tensile strength of 2.25Cr-1Mo steel with hydrogen charging is 536.30MPa,de-creased by approximately 57MPa and reduction of area is 43.62%,decreased by 7%,compared with the specimens without hydrogen charging. Hydrogen embrittlement-induced regions known as"fisheyes"and quasi-cleavage morphology are observed on the tensile fracture surface.The AE signals activity in the elastic stage of hydrogen charged 2.25Cr-1Mo steel is enhanced,but the acoustic emis-sion signals activity in the yield stage is decreased.The cumulative absolute energy of AE signals of hydrogen charged specimens during deformation is almost one order magnitude lower than that with-out hydrogen charged specimens.The AE signals amplitude generated by the hydrogen charged speci-mens is about 0.33mV lower than that of the specimens without hydrogen charging during tensile de-formation,and that the bandwidth of signal is reduced by 0.06MHz.Though the analysis of AE sig-nals,it is found that tensile deformation microscopic mechanism of hydrogen charged specimens is that dislocation emission and motion is enhanced but dislocation cross-slip is inhibited by hydrogen.关键词
声发射/Cr-Mo钢/充氢/位错运动/拉伸变形Key words
acoustic emission/Cr-Mo steel/hydrogen charging/dislocation motion/tensile deformation分类
矿业与冶金引用本文复制引用
滕全全,汪悦,有移亮,张峥..充氢Cr-Mo钢变形过程的声发射特征[J].材料工程,2017,45(10):138-144,7.基金项目
国家重点研发计划资助项目(2016YFC0801900) （2016YFC0801900）
