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Acta Metall Sin  2009, Vol. 45 Issue (12): 1487-1492    DOI:
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STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF GRADIENT FUNCTIONAL LAYER PREPARED BY CO2 SURFACING WELDING WITH ELECTROMAGNETIC STIR
LUO Jian 1; WANG Xiangjie 1;2; ZHAO Guoji 1;2; WANG Jiaxu 1
1. The State Key Laboratory of Mechanical Transmission; Chongqing University; Chongqing 400030
2. College of Material Science and Engineering; Chongqing University; Chongqing 400030
Cite this article: 

LUO Jian WANG Xiangjie ZHAO Guoji WANG Jiaxu . STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF GRADIENT FUNCTIONAL LAYER PREPARED BY CO2 SURFACING WELDING WITH ELECTROMAGNETIC STIR. Acta Metall Sin, 2009, 45(12): 1487-1492.

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Abstract  

Functional gradient materials have been applied in many engineering fields, such as hot forging moulds. The CO2 surfacing welding technology is an important technique to fabricate functional gradient materials. The CO2 surfacing welding experiment on Q235 low carbon steel plate has been carried out with additional pulsed AC longitudinal magnetic field (electromagnetic stir, EMS). Through the analyss of microstructure, hardness, wear resistance and thermal mechanical properties of surface clad layers, the effects and functions of EMS have been studied at CO2 welded joints. The rslts show that EMS can improve the interficial mcrostructure of surface clad layers, refine their grains, increase the hardness and wear resistance of surface layers, and enhance ther therml echanical properties. This surfacing welding can be applied to fabricate new high–qualty double–etal hot forging moulds and heat stretch extension mouds.

Key words:  CO2 welding      electromagnetic stir      microstructuremechanical property     
Received:  26 May 2009     
ZTFLH: 

TG455

 
Fund: 

Supported by Specialized Research Fund for the Doctoral Program of Higher Education (No.20070611030), Program for New Century Excellent Talents in University (No.NCET–08–0607), Program for Changjiang Scholars and Innovative Research Team in University (No.IRT 0763) and Natural Science Foundation Project of Chongqing (Nos.CSTC 2008BB3303, CSTC2009BA3026)

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I12/1487

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