巴德玛,马世宁,孟凡军

• 1:装甲兵工程学院装备再制造技术国防科技重点实验室
• 2:装甲兵工程学院装备再制造技术国防科技重点实验室
• 3:装甲兵工程学院装备再制造技术国防科技重点实验室 北京100072
• 4:北京100072

摘要(Abstract)：

采用超音速微粒轰击技术在38CrSi合金钢表面制备了厚度约为25μm纳米晶层。利用X射线衍射、扫描电镜和透射电镜对表面结构进行分析。纳米结构层的最表面层的晶粒尺寸约为16nm,晶粒尺寸随着距表面距离的增加而增大。利用纳米压痕仪对表面纳米结构层的力学性能进行研究,结果表明,当表面晶粒尺寸降低到纳米量级时力学性能明显改善,最表面纳米结构层的硬度是基体的2倍左右,并服从Hall-Petch关系;表面纳米结构层的弹性恢复系数明显提高;利用该方法制备的纳米晶对弹性模量的影响较小;对表面纳米化样品进行低温退火处理可使纳米结构层的性能更加稳定。分析表明表面纳米结构层力学性能的改善主要是表面晶粒细化的结果。

关键词(KeyWords)： 表面纳米化;纳米结构层;38CrSi钢;力学性能

Abstract:

Keywords:

基金项目(Foundation): 装备维修科研资助项目(2004.1541)

作者(Author): 巴德玛,马世宁,孟凡军

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