Effect of Mo on microstructure and wear resistance of slag-free self-shielded metal-cored welding overlay

Dashuang Liu; Jiayou Wang; Yu Zhang; Rangasayee Kannan; Weimin Long; Mingfang Wu; Yiyu Wang; Leijun Li

doi:10.1016/j.jmatprotec.2019.02.024

Effect of Mo on microstructure and wear resistance of slag-free self-shielded metal-cored welding overlay

Dashuang Liu, Jiayou Wang, Yu Zhang, Rangasayee Kannan, Weimin Long, Mingfang Wu, Yiyu Wang, Leijun Li

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

A new type of slag-free self-shielded metal-cored wire with various Mo contents has been developed to fabricate an experimental hardfacing alloy. The developed metal-cored wire exhibits an average Mo transfer coefficient of 90%. All the hardfacing alloys have a hypereutectic microstructure consisting of primary M ₇ C ₃ carbide, and eutectic of M ₃ C carbide plus martensite and residual austenite. The primary carbide fraction is about 38 vol. % in the Mo-free hardfacing alloy; it increases to about 45 vol. % in the alloy when the Mo content increases to 1.35 wt. %. No significant increase in the primary carbide fraction has been observed when the Mo content in the hardfacing alloy is increased further. The wear resistance of Mo-containing hardfacing alloys is better than the Mo-free hardfacing alloy. However, the wear resistance does not increase significantly when the Mo content in the hardfacing alloy is increased beyond 1.35 wt. %. Thermodynamic driving force calculations provide an explanation for the observed primary carbide fraction change in the hardfacing alloys as a function of Mo levels, and the fraction of primary M ₇ C ₃ carbide seems to play a key role in deciding the wear performance of the hardfacing alloys.

Original language	English
Pages (from-to)	82-91
Number of pages	10
Journal	Journal of Materials Processing Technology
Volume	270
DOIs	https://doi.org/10.1016/j.jmatprotec.2019.02.024
State	Published - Aug 2019
Externally published	Yes

Funding

Liu acknowledge the support by China Postdoctoral Science Foundation Funded Project (2016M601753), Open Project Program of the State Key Laboratory of Advanced Brazing Filler Metals and Technology (SKLABFMT-2017-03) and Jiangsu Government Scholarship for Overseas Studies (JS-2016-133). Wang acknowledges Industry-University-Institute Cooperation Joint Research Project of Jiangsu Province of China (BY2016073-08). Long acknowledges Central Plains Scholar Project of Henan Province (172101510003). Li, Kannan, and Wang acknowledge Natural Sciences and Engineering Research Council (NSERC) of Canada for the financial support. Liu acknowledge the support by China Postdoctoral Science Foundation Funded Project ( 2016M601753 ), Open Project Program of the State Key Laboratory of Advanced Brazing Filler Metals and Technology ( SKLABFMT-2017-03 ) and Jiangsu Government Scholarship for Overseas Studies ( JS-2016-133 ). Wang acknowledges Industry-University-Institute Cooperation Joint Research Project of Jiangsu Province of China ( BY2016073-08 ). Long acknowledges Central Plains Scholar Project of Henan Province ( 172101510003 ). Li, Kannan, and Wang acknowledge Natural Sciences and Engineering Research Council (NSERC) of Canada for the financial support.

Keywords

Hardacing
Microstructure
Mo concentration
Self-shielded metal-cored wire
Wear resistance

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10.1016/j.jmatprotec.2019.02.024

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title = "Effect of Mo on microstructure and wear resistance of slag-free self-shielded metal-cored welding overlay",

abstract = " A new type of slag-free self-shielded metal-cored wire with various Mo contents has been developed to fabricate an experimental hardfacing alloy. The developed metal-cored wire exhibits an average Mo transfer coefficient of 90%. All the hardfacing alloys have a hypereutectic microstructure consisting of primary M 7 C 3 carbide, and eutectic of M 3 C carbide plus martensite and residual austenite. The primary carbide fraction is about 38 vol. % in the Mo-free hardfacing alloy; it increases to about 45 vol. % in the alloy when the Mo content increases to 1.35 wt. %. No significant increase in the primary carbide fraction has been observed when the Mo content in the hardfacing alloy is increased further. The wear resistance of Mo-containing hardfacing alloys is better than the Mo-free hardfacing alloy. However, the wear resistance does not increase significantly when the Mo content in the hardfacing alloy is increased beyond 1.35 wt. %. Thermodynamic driving force calculations provide an explanation for the observed primary carbide fraction change in the hardfacing alloys as a function of Mo levels, and the fraction of primary M 7 C 3 carbide seems to play a key role in deciding the wear performance of the hardfacing alloys.",

keywords = "Hardacing, Microstructure, Mo concentration, Self-shielded metal-cored wire, Wear resistance",

author = "Dashuang Liu and Jiayou Wang and Yu Zhang and Rangasayee Kannan and Weimin Long and Mingfang Wu and Yiyu Wang and Leijun Li",

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AU - Liu, Dashuang

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AU - Long, Weimin

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N2 - A new type of slag-free self-shielded metal-cored wire with various Mo contents has been developed to fabricate an experimental hardfacing alloy. The developed metal-cored wire exhibits an average Mo transfer coefficient of 90%. All the hardfacing alloys have a hypereutectic microstructure consisting of primary M 7 C 3 carbide, and eutectic of M 3 C carbide plus martensite and residual austenite. The primary carbide fraction is about 38 vol. % in the Mo-free hardfacing alloy; it increases to about 45 vol. % in the alloy when the Mo content increases to 1.35 wt. %. No significant increase in the primary carbide fraction has been observed when the Mo content in the hardfacing alloy is increased further. The wear resistance of Mo-containing hardfacing alloys is better than the Mo-free hardfacing alloy. However, the wear resistance does not increase significantly when the Mo content in the hardfacing alloy is increased beyond 1.35 wt. %. Thermodynamic driving force calculations provide an explanation for the observed primary carbide fraction change in the hardfacing alloys as a function of Mo levels, and the fraction of primary M 7 C 3 carbide seems to play a key role in deciding the wear performance of the hardfacing alloys.

AB - A new type of slag-free self-shielded metal-cored wire with various Mo contents has been developed to fabricate an experimental hardfacing alloy. The developed metal-cored wire exhibits an average Mo transfer coefficient of 90%. All the hardfacing alloys have a hypereutectic microstructure consisting of primary M 7 C 3 carbide, and eutectic of M 3 C carbide plus martensite and residual austenite. The primary carbide fraction is about 38 vol. % in the Mo-free hardfacing alloy; it increases to about 45 vol. % in the alloy when the Mo content increases to 1.35 wt. %. No significant increase in the primary carbide fraction has been observed when the Mo content in the hardfacing alloy is increased further. The wear resistance of Mo-containing hardfacing alloys is better than the Mo-free hardfacing alloy. However, the wear resistance does not increase significantly when the Mo content in the hardfacing alloy is increased beyond 1.35 wt. %. Thermodynamic driving force calculations provide an explanation for the observed primary carbide fraction change in the hardfacing alloys as a function of Mo levels, and the fraction of primary M 7 C 3 carbide seems to play a key role in deciding the wear performance of the hardfacing alloys.

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Effect of Mo on microstructure and wear resistance of slag-free self-shielded metal-cored welding overlay

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