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Microstructural evolution and bonding characteristic in multi-layer laser cladding of NiCoCr alloy on compacted graphite cast iron
Liu H; Hao JB; Han ZT; Yu G(虞钢); He XL(何秀丽); Yang HF; Yang, HF (reprint author), China Univ Min & Technol, Sch Mech & Elect Engn, Xuzhou 221116, Peoples R China.
Source PublicationJOURNAL OF MATERIALS PROCESSING TECHNOLOGY
2016
Volume232Pages:153-164
ISSN0924-0136
Abstract

Laser cladding of NiCoCr alloy powder on cast iron was performed with a 1 kW Nd:YAG continuous laser. Despite numerous advantages, one of the most critical issues is the formation of martensite and a brittle layer in the vicinity of the bonding interface due to the inherent rapid cooling, which might result in cracking nearby and a decrease in bonding strength. The objective of this research is to produce well bonded NiCrCo alloy coating that is free of pores and cracks on cast iron without preheating the whole substrate. Considering the poor weldability of cast iron, the strategy of reciprocated deposition, namely multi-layer laser cladding, was applied. The microstructural evolution of the multi-layer coating on the cast iron was investigated with the emphasis on the variation of the bonding zone. The results showed that NiCoCr coatings with different layers consisted of fine solid solution dendrites surrounded by an inter-dendritic network of precipitates. The multi-layer clad coating had a gradual distribution of elements, which was different from that in the single layer coating. The martensite near the bonding interface was transformed into tempered sorbite under the thermal influence of multi-layer deposition, leading to a decrease in the high micro-hardness zone width. A bending test confirmed that the bonding brittleness was reduced and the mechanical properties were improved through the use of the multi-layer laser cladding approach. (C) 2016 Elsevier B.V. All rights reserved.

KeywordMulti-layer Laser Cladding Cast Iron Bonding Interface Microstructural Evolution Micro-hardness
DOI10.1016/j.jmatprotec.2016.02.001
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000372560500014
WOS KeywordMulti-layer Laser Cladding ; Cast Iron ; Bonding Interface ; Microstructural Evolution ; Micro-hardness
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Industrial ; Engineering, Manufacturing ; Materials Science, Multidisciplinary
Funding OrganizationThe author acknowledges the Fundamental Research Funds for the Central Universities (Grant No. 2015QNA35) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) for supporting this work.
DepartmentMAM激光智能制造工艺力学
Classification一类
Citation statistics
Cited Times:39[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59547
Collection先进制造工艺力学实验室
Corresponding AuthorYang, HF (reprint author), China Univ Min & Technol, Sch Mech & Elect Engn, Xuzhou 221116, Peoples R China.
Recommended Citation
GB/T 7714
Liu H,Hao JB,Han ZT,et al. Microstructural evolution and bonding characteristic in multi-layer laser cladding of NiCoCr alloy on compacted graphite cast iron[J]. JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,2016,232:153-164.
APA Liu H.,Hao JB.,Han ZT.,Yu G.,He XL.,...&Yang, HF .(2016).Microstructural evolution and bonding characteristic in multi-layer laser cladding of NiCoCr alloy on compacted graphite cast iron.JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,232,153-164.
MLA Liu H,et al."Microstructural evolution and bonding characteristic in multi-layer laser cladding of NiCoCr alloy on compacted graphite cast iron".JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 232(2016):153-164.
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