谢锐,吕铮,石英男,王晴,刘春明

• 1:沈阳建筑大学材料科学与工程学院
• 2:东北大学材料科学与工程学院材料各向异性与织构教育部重点实验室

摘要(Abstract)：

采用放电等离子烧结(Spark plasma sintering,SPS)工艺制备了成分为Fe-9Cr-1.5W-0.4Mn-0.2V-0.1Ta-0.3Ti-0.3Y_2O_3(质量分数,%)的9Cr-ODS钢。利用扫描电镜(SEM)、透射电镜(TEM)、电子背散射衍射(EBSD)、高分辨透射电镜(HRTEM)对ODS钢的宏观烧结特征、晶粒形貌、析出相形貌等进行表征。利用万能拉伸试验机测量不同温度下样品的力学性能。结果表明:通过放电等离子体烧结工艺可以制备出具有超细晶粒的ODS钢,950℃/5 min时烧结效果最好,致密度达到97.7%。950℃/5 min烧结后样品的晶粒呈现粉末颗粒表面晶粒粗大(>1μm)而内部晶粒细小(纳米级)的现象,样品内的析出相以高密度、纳米尺寸、弥散分布的纳米团簇为主,其分布密度可以达到5.1×10~(22)个/m~3,同时还发现了少量化学计量比的Y_2Ti_2O_7。放电等离子体950℃/5 min烧结样品的常温和650℃拉伸强度分别达1040 MPa和407 MPa。

关键词(KeyWords)： 9Cr-ODS钢;放电等离子烧结;微观结构;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金/青年科学基金资助项目(51601031);; 辽宁省自然科学基金面上项目(2017540306)

作者(Author): 谢锐,吕铮,石英男,王晴,刘春明

DOI: 10.13289/j.issn.1009-6264.2018-0214

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