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过量的Fe2O3对铝热法制备微纳结构316L奥氏体不锈钢组织和拉伸性能的影响
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兰州理工大学

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国家自然基金Grant No. 51561020


Effect of Excess Fe2O3 in Reactions on Microstructure and Tensile Properties of Micro-nano Structure 316L Austenitic Stainless Steels Prepared by Aluminothermic Method
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State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology

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    摘要:

    不锈钢结构和成分的调节对其获得良好综合性能至关重要。本文为了使铝热反应完全,降低316L ASSs中残余Al的含量,在反应粉体中加入了不同过量比的Fe2O3粉末,详细分析了过量Fe2O3对316L奥氏体不锈钢微纳米组织和拉伸性能的影响。结果表明,随着Fe2O3过量百分比的增加,铁素体相的体积分数显著降低,而纳米晶的体积分数由87.4%提高到了93.4%,平均晶粒尺寸由32 nm降低到了22 nm。对比分析表明,铝热法制备316L ASSs的最佳工艺参数为添加过量比5.0 %的Fe2O3,在该条件下制备的单相奥氏体钢,其抗拉强度为573.92 MPa,屈服强度为340.12 MPa,延伸率约为4.68%。

    Abstract:

    The regulation of structure and composition is very important for obtaining stainless steel with good comprehensive properties. In present paper, Fe2O3 powers with different excess ratios were added in reaction powders to make aluminothermic reaction completely and reduce the content of Al in the 316L ASSs. The effects of excess Fe2O3 in reactions on microstructure and tensile properties of micro-nano structure of 316L austenitic stainless steels were analyzed in detail. The results showed that, with the increase of Fe2O3 excess percentage, the volume fraction of ferrite phase reduced significantly while the volume fraction of nanocrystalline increased from 87.4 % to 93.4 % and the average grain size decreased from 32 nm to 22 nm. The comparative analysis showed that the Fe2O3 excess percentage of 5.0 % was the best process parameter for the 316L ASSs preparation by the aluminothermic method. For the single phase austenitic steel prepared under this condition, the tensile strength was 573.92 MPa, the yield strength was 340.12 MPa, and the elongation was about 4.68 %.

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王娇,郑月红,魏莹,喇培清,袁觅文,石玉.过量的Fe2O3对铝热法制备微纳结构316L奥氏体不锈钢组织和拉伸性能的影响[J].稀有金属材料与工程,2021,50(2):443~450.[Jiao Wang, Yuehong Zheng, Ying Wei, Peiqing La, Miwen Yuan, Yu Shi. Effect of Excess Fe2O3 in Reactions on Microstructure and Tensile Properties of Micro-nano Structure 316L Austenitic Stainless Steels Prepared by Aluminothermic Method[J]. Rare Metal Materials and Engineering,2021,50(2):443~450.]
DOI:10.12442/j. issn.1002-185X.20200002

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  • 收稿日期:2020-01-02
  • 最后修改日期:2020-06-08
  • 录用日期:2020-06-09
  • 在线发布日期: 2021-03-09
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