Gradually varying mechanical properties of in situ synthesized NbC-Fe-graded composite coating

被引：3

作者：

Zhao, Nana ^{[1
]}

Xu, Yunhua ^{[1
,2
]}

Zhang, Weiqiang ^{[3
]}

Zhao, Ziyuan ^{[1
]}

Zhong, Lisheng ^{[1
]}

Fu, Yonghong ^{[2
]}

机构：

[1] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Peoples R China

[2] Shaanxi Key Lab Nano Mat & Technol, Xian 710055, Peoples R China

[3] China Shipbldg Ind Corp, Res Inst 12, Xingping 713102, Peoples R China

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2017年 / 33卷 / 02期

基金：

中国国家自然科学基金;

关键词：

NbC; Graded composite coating; Dense ceramic layer; Mechanical properties; Fracture toughness; ELASTIC-PLASTIC INDENTATION; NIOBIUM CARBIDE; NANOCOMPOSITE COATINGS; CORROSION-RESISTANCE; FRACTURE-TOUGHNESS; AISI-1040; STEEL; WEAR BEHAVIOR; TOOL STEEL; CO CERMETS; MICROSTRUCTURE;

D O I：

10.1080/02670836.2016.1182339

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

NbC-Fe-graded composite coating was fabricated by in situ synthesis using a pure niobium plate and grey cast iron as the raw materials. SEM analysis demonstrates that the thickness of coating is about 400 mu m. From the surface to the matrix, the volume fraction of NbC particulates continuously decreases from 95 to 0%, while the average particulate diameter gradually increases from 200 nm to 1 mu m. Along the depth towards the matrix, the nano-hardness and elastic modulus of the graded coating decrease from 23.5 to 3 GPa and from 435 to 150 GPa, respectively. In addition, the fracture toughness (K-C) of 8.62 MPa m(1/2) is obtained on the surface of the coating by the Vickers indentation technique. And the fracture mechanism is intergranular cracking.

引用

页码：220 / 226

页数：7

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