Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

Wenlin Mo; Xiaobing Hu; Shanping Lu; Dianzhong Li; Yiyi Li

doi:10.1016/j.jmst.2015.08.001

Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

Wenlin Mo, Xiaobing Hu, Shanping Lu^*, Dianzhong Li, Yiyi Li

^*Corresponding author for this work

NUANCE - Atomic and Nanoscale Characterization Experimental Center

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

29 Scopus citations

Abstract

The distribution of boron and the microstructure of grain boundary (GB) precipitates (M₂₃(C, B)₆ and M₂B) have been analyzed with their effects on the susceptibility of ductility-dip-cracking (DDC) and tensile properties for NiCrFe-7 weld metal, using optical microscopy (OM), secondary ion mass spectroscopy (SIMS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results show that boron segregates at GBs in NiCrFe-7 weld metal during the welding process. The segregation of boron at GBs promotes the formation of continuous M₂₃(C, B)₆ carbide chains and M₂B borides along GBs. The addition of boron aggravates GB embrittlement and causes more DDC in the weld metal, by its segregation at GBs presenting as an impurity, and promoting the formation of larger and continuous M₂₃(C, B)₆ carbides, and M₂B borides along GBs. DDC in the weld metal deteriorates the ductility and tensile strength of the weld metal simultaneously.

Original language	English (US)
Pages (from-to)	1258-1267
Number of pages	10
Journal	Journal of Materials Science and Technology
Volume	31
Issue number	12
DOIs	https://doi.org/10.1016/j.jmst.2015.08.001
State	Published - Dec 1 2015

Funding

The authors are grateful for financial support by the National Natural Science Foundation of China (No. 51474203 ) and Key Research Program of the Chinese Academy of Sciences (No. KGZD-EW-XXX-2 ). The authors also wish to recognize the assistance provided by China First Heavy Machinery Co. Ltd. in the welding process.

Keywords

Boron
Ductility-dip-cracking
MB
MC
Tensile properties

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics
Metals and Alloys
Materials Chemistry

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10.1016/j.jmst.2015.08.001

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title = "Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal",

abstract = "The distribution of boron and the microstructure of grain boundary (GB) precipitates (M23(C, B)6 and M2B) have been analyzed with their effects on the susceptibility of ductility-dip-cracking (DDC) and tensile properties for NiCrFe-7 weld metal, using optical microscopy (OM), secondary ion mass spectroscopy (SIMS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results show that boron segregates at GBs in NiCrFe-7 weld metal during the welding process. The segregation of boron at GBs promotes the formation of continuous M23(C, B)6 carbide chains and M2B borides along GBs. The addition of boron aggravates GB embrittlement and causes more DDC in the weld metal, by its segregation at GBs presenting as an impurity, and promoting the formation of larger and continuous M23(C, B)6 carbides, and M2B borides along GBs. DDC in the weld metal deteriorates the ductility and tensile strength of the weld metal simultaneously.",

keywords = "Boron, Ductility-dip-cracking, MB, MC, Tensile properties",

author = "Wenlin Mo and Xiaobing Hu and Shanping Lu and Dianzhong Li and Yiyi Li",

note = "Publisher Copyright: {\textcopyright} 2015.",

year = "2015",

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doi = "10.1016/j.jmst.2015.08.001",

language = "English (US)",

volume = "31",

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T1 - Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

AU - Mo, Wenlin

AU - Hu, Xiaobing

AU - Lu, Shanping

AU - Li, Dianzhong

AU - Li, Yiyi

PY - 2015/12/1

Y1 - 2015/12/1

N2 - The distribution of boron and the microstructure of grain boundary (GB) precipitates (M23(C, B)6 and M2B) have been analyzed with their effects on the susceptibility of ductility-dip-cracking (DDC) and tensile properties for NiCrFe-7 weld metal, using optical microscopy (OM), secondary ion mass spectroscopy (SIMS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results show that boron segregates at GBs in NiCrFe-7 weld metal during the welding process. The segregation of boron at GBs promotes the formation of continuous M23(C, B)6 carbide chains and M2B borides along GBs. The addition of boron aggravates GB embrittlement and causes more DDC in the weld metal, by its segregation at GBs presenting as an impurity, and promoting the formation of larger and continuous M23(C, B)6 carbides, and M2B borides along GBs. DDC in the weld metal deteriorates the ductility and tensile strength of the weld metal simultaneously.

AB - The distribution of boron and the microstructure of grain boundary (GB) precipitates (M23(C, B)6 and M2B) have been analyzed with their effects on the susceptibility of ductility-dip-cracking (DDC) and tensile properties for NiCrFe-7 weld metal, using optical microscopy (OM), secondary ion mass spectroscopy (SIMS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results show that boron segregates at GBs in NiCrFe-7 weld metal during the welding process. The segregation of boron at GBs promotes the formation of continuous M23(C, B)6 carbide chains and M2B borides along GBs. The addition of boron aggravates GB embrittlement and causes more DDC in the weld metal, by its segregation at GBs presenting as an impurity, and promoting the formation of larger and continuous M23(C, B)6 carbides, and M2B borides along GBs. DDC in the weld metal deteriorates the ductility and tensile strength of the weld metal simultaneously.

KW - Boron

KW - Ductility-dip-cracking

KW - MB

KW - MC

KW - Tensile properties

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Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

Abstract

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Keywords

ASJC Scopus subject areas

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