Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

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文章编号:1004-0609(2008)08-1421-05
冷喷涂Ni涂层的微观组织
章华兵1,张俊宝2,梁永立2,宋洪伟2

(1. 宝山钢铁股份有限公司 宝钢分公司,上海 201900;
2. 宝山钢铁股份有限公司 技术中心前沿技术研究所,上海 201900
)

摘 要:  

采用SEMTEM对冷喷涂Ni涂层的微观组织进行表征。结果表明:在粒子尺寸范围内,Ni涂层的微观组织有明显差异:粒子界面处,微观组织以带状晶和等轴晶为主;界面附近以位错墙、位错缠结形貌为主,且距离界面越近,晶粒细化越明显;两区域对应的组织演变机制分别是高应变速率动态再结晶机制和位错运动导致的晶粒细化机制。

 

关键词: Ni涂层;冷喷涂;动态再结晶;微观组织

Microstructures of cold-sprayed Ni coating
ZHANG Hua-bing1, ZHANG Jun-bao2, LIANG Yong-li2, SONG Hong-wei2

1. Baosteel Branch, Baoshan Iron and Steel Co. Ltd., Shanghai 201900, China;
2. Advanced Technology Institute, Baosteel Technology Center, Baoshan Iron and Steel Co. Ltd., Shanghai 201900, China

Abstract: The microstructures of cold-sprayed Ni coating were characterized by SEM and TEM. The results show that the local microstructure in a particle of the cold-sprayed Ni coating reveals a quite inhomogeneous appearance. Elongated grains and equiaxed grains are typical microstructures at the particle-particle interface, while the regions near the interface exhibit heavily deformed appearance with a large number of dislocation walls or dislocation tangles. Moreover, the grain refinement near the interface is more pronounced than that on the periphery of the interface. The main mechanisms for microstructural evolution at, and near the interface are the dynamic recrystallization under high-strain-rate deformation and the plastic strain-induced grain refinement due to dislocation movement, respectively.

 

Key words: Ni coating; cold spray; dynamic recrystallization; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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