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Effects of rare earth oxide Y2O3 on microstructure and mechanical properties of proeutectoid ferrite/granular bainitic coating

Published online by Cambridge University Press:  10 May 2016

X.L. Xing ,
Y.F. Zhou ,
Y.G. Zhuo ,
J.B. Wang ,
Y.L. Yang  and
Q.X. Yang
X.L. Xing
Affiliation:
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, People's Republic of China
Y.F. Zhou*
Affiliation:
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, People's Republic of China; and College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, People's Republic of China
Y.G. Zhuo
Affiliation:
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, People's Republic of China; and Environmental Management College of China, Qinhuangdao 066001, People's Republic of China
J.B. Wang
Affiliation:
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, People's Republic of China
Y.L. Yang
Affiliation:
College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, People's Republic of China
Q.X. Yang*
Affiliation:
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, People's Republic of China
*
a)Address all correspondence to these authors. e-mail: yfzhou@ysu.edu.cn
b)e-mail: qxyang@ysu.edu.cn
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Abstract

The effects of rare earth oxide Y2O3 additive on microstructure and mechanical properties of proeutectoid ferrite/granular bainitic coating by flux-cored arc welding were investigated. The results show that the primary austenite in the bainitic coating can be refined by Y2O3. The grain size of primary austenite is decreased from 51.2 µm to 40.1 µm with the increased Y2O3. The size of proeutectoid ferrite is decreased significantly and the fraction of the bainite is increased, which in turn facilitates the uniform distribution of the M/A island. Large number of the dislocation martensite is transformed into M/A. With the increased Y2O3 additive, the hardness and the tensile strength of the coating increases from HV 272 ± 13 to HV 312 ± 8 and from 764 ± 10 MPa to 885 ± 12 MPa, respectively. Moreover, the wear resistance of the coating with Y2O3 additive is increased simultaneously.

Keywords

coatinggranular bainiteY2O3tensile strengthwear-resistance
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 12 , 28 June 2016 , pp. 1702 - 1710
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Copyright
Copyright © Materials Research Society 2016 

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