| 工业纯铁表面自纳米化及其表征 |
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| 引用本文： | 孙建春,盛光敏,王越田,卢昊,韩靖.工业纯铁表面自纳米化及其表征[J].中南大学学报(自然科学版),2011,42(1). |
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| 作者姓名： | 孙建春 盛光敏 王越田 卢昊 韩靖 |
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| 作者单位： | 1. 重庆大学材料科学与工程学院,重庆,400044;重庆科技学院,冶金与材料工程学院,重庆,4013311
2. 重庆大学材料科学与工程学院,重庆,400044 |
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| 基金项目： | 国家自然科学基金资助项目(50675234) |
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| 摘 要： | 利用高能喷丸(High energy shot peening,HESP)法在工业纯铁的表面获得一定厚度的纳米晶层,实现工业纯铁表面自纳米化。通过金相显微镜观测、扫描电子显微镜分析、显微硬度测试以及X线衍射计算分析,对工业纯铁表面自纳米化层的组织结构和性能进行研究分析。研究结果表明:采用HESP方法实现工业纯铁表面纳米化的主要工艺参数是:喷丸弹丸为直径1 mm的铸铁,喷丸压力为0.6 MPa,喷枪距离试样表面为5 cm,所获得的纳米晶的厚度随着喷丸时间的增加而增加;剧烈变形层由于晶粒得到了细化,其显微硬度大大提高,在距喷丸面10μm处,其显微硬度(HV)达到296.6,随着距喷丸面距离的增加,剧烈变形层的硬度不断减小;只要喷丸1 min,即可在工业纯铁表面获得平均晶粒粒径为68.4 nm、微观畸变为0.050%的纳米晶层;随着喷丸时间的延长,晶粒粒径越来越小,而微观应变越来越大;喷丸14 min可在工业纯铁表面获得平均晶粒粒径为28.5 nm、微观畸变为0.175%的纳米晶层。
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| 关 键 词： | 工业纯铁 自纳米化 表征 |
Surface self-nanocrystallization of commercial iron and its characterization |
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| SUN Jian-chun,SHENG Guang-min,WANG Yue-tian,LU Hao,HAN Jing.Surface self-nanocrystallization of commercial iron and its characterization[J].Journal of Central South University:Science and Technology,2011,42(1). |
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| Authors: | SUN Jian-chun SHENG Guang-min WANG Yue-tian LU Hao HAN Jing |
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| Institution: | SUN Jian-chun1,2,SHENG Guang-min1,WANG Yue-tian1,LU Hao1,HAN Jing1 (1.College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China,2.College of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China) |
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| Abstract: | The commercial iron was successfully surface nanocrystallizated with high energy shot peening(HESP) method.The performance and microstructure of self-surface nanocrystalline layer on the commercial iron were studied and analyzed through microscope observation,scanning electron microscopy(SEM) analysis,microhardness test and X-ray diffraction(XRD) analysis.The results indicate that a nanocrystalline layer of commercial iron can be obtained by HESP method with the following parameters: with 1 mm diameter cast... |
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| Keywords: | commercial iron self-nanocrystallization characterization |
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