40Cr钢表面纳米层形成机理的研究
Discussions on Formation Mechanism of Nanocrystallized Layer of 40 Cr Steel
查看参考文献13篇
文摘
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通过扫描电子显微镜、X射线衍射仪和透射电子显微镜分析研究了高能表面处理后40 Cr钢表面纳米层的组织结构,探讨了表面纳米层的形成机理.利用纳米压痕仪测定了表面纳米层的硬度.结果表明,采用高能表面处理技术在40 Cr钢表面制备出平均晶粒尺寸约为11 nm的表面纳米层.纳米层的形成过程中,粒状渗碳体易于产生应力集中,在集中应力的作用下通过破裂碎化形成纳米晶;铁素体通过位错产生、缠结等,细化为小尺寸晶粒.表面纳米层的硬度明显提高. |
其他语种文摘
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The microstructures of the nanocrystalline layer in 40 Cr steel induced by using a high-power surface processing (HPSP) technique were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). A possible mechanism of the nanocrystallined layer was discussed. Nanohardness of the nanocrystalline layer was measured by nanoindentation. Experimental evidences showed that the nanocrystalline layer was fabricated on the surface of 40 Cr steel treated by HPSP treatment. The mean grain size in the surface layer is about 11 nm.The mechanism of the nanocrystalized layer can be discribed as follows : particulate cementite is fractured, which is induced by the concentration of stress; after dislocations generation, accumulation and interaction in ferrite,and so on, the dislocation activities lead to the formation of the dislocation cells, ferrite nanocrystals coming into being. The nanohardness in the surface nanocrystallized layer is enhanced significantly after HPSP treatment. |
来源
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同济大学学报. 自然科学版
,2005,33(2):196-200,233 【核心库】
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关键词
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微观结构
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40 Cr钢
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纳米层
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细化
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机理
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地址
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1.
同济大学,材料科学与工程学院, 上海, 200032
2.
中国科学院,金属研究所, 辽宁, 沈阳, 110016
3.
宝山钢铁股份有限公司技术中心, 上海, 201900
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0253-374X |
学科
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金属学与金属工艺 |
文献收藏号
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CSCD:1920400
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