| 双相不锈钢热老化前后拉伸变形行为的电子背散射衍射表征 |
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| 作者姓名： | 刘刚 李时磊 王艳丽 王西涛 |
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| 作者单位： | 1. 北京科技大学新金属材料国家重点实验室, 北京 100083; |
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| 基金项目： | 国家重点基础研究发展计划资助项目(2012AA050901) |
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| 摘 要： | 通过电子背散射衍射实验分析方法,研究变形量和热老化因素对双相不锈钢的拉伸性能、相边界、局部应变分布、重位点阵特殊晶界和取向分布的影响.研究结果表明:热老化后,双相不锈钢的强度提高,韧性降低;在大变形条件下铁素体晶粒内小角度晶界的数量和密度略有增加;热老化材料的铁素体的塑性变形和局部应变能力下降,大变形破坏初始奥氏体和铁素体以及Σ3孪晶边界的分布.
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| 关 键 词： | 不锈钢 热老化 拉伸 塑性变形 |
| 收稿时间： | 2014-12-16 |
Tensile deformation behavior of duplex stainless steel before and after thermal aging by EBSD |
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| Affiliation: | 1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The effects of deformation degree and thermal aging on the tensile properties,phase boundaries,local strain distribution,coincidence site lattice(CSL) boundaries and orientation distribution of duplex stainless steels were investigated by electron backscattered diffraction(EBSD). It is found that after thermal aging,the strength of duplex stainless steels enhances and the ductility decreases. The number and density of small-angle boundaries in ferrite grains increase slightly under large deformation conditions.The plastic deformation ability and local strain in ferrite phases of the thermal aged materials decline. Large deformation destroys the original distribution of austenite and ferrite grains,as well as Σ3 twinning boundaries. |
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