阮文超,李烈军,倪东惠,张伟鹏,黄成成

• 1:华南理工大学国家金属材料近净成形工程技术研究中心

摘要(Abstract)：

采用20 vol%～80 vol%的尿素作为造孔剂制备了泡沫不锈钢。研究了尿素含量对泡沫不锈钢孔隙率、显微组织和力学性能的影响。结果表明:在1200℃下烧结5 h,泡沫不锈钢的孔隙率为18.33%～72.24%。随着尿素含量增加,生坯致密度和烧结体积收缩率增大。在尿素含量大于60 vol%时,烧结体积收缩率骤增。建立了预测孔隙率θ的模型:■,实现了对尿素含量介于0～1的孔隙率的预测。泡沫不锈钢的晶粒尺寸随着孔隙率的增加而减小,多孔结构可以有效抑制晶粒长大。泡沫的压缩屈服强度在低孔隙率时比Gibson-Ashby模型的预测值高,对模型进行修正后可以准确预测泡沫的压缩屈服强度。

关键词(KeyWords)： 泡沫不锈钢;造孔剂技术;孔隙率;晶粒尺寸;Gibson-Ashby模型

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51674124)

作者(Author): 阮文超,李烈军,倪东惠,张伟鹏,黄成成

DOI: 10.13289/j.issn.1009-6264.2020-0009

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