Carbon diffusion in dissimilar joints between P91 and 12Cr1MoV steels welded by different consumables at high temperature

Y. Zhao; J. Gong; X. Wang; W. Gao; Q. Li

doi:10.1179/1878641315Y.0000000002

Carbon diffusion in dissimilar joints between P91 and 12Cr1MoV steels welded by different consumables at high temperature

Y. Zhao, J. Gong, X. Wang, W. Gao, Q. Li

School of Mechanical and Power Engineering

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

11 Scopus citations

Abstract

Three consumables: 9CrMoV(N), R31, and GTR-2CM are considered in welding P91 and 12Cr1MoV together. The stable phases and carbon activities of the involved materials were calculated by THERMO-CALC. Carbon diffusion after aging for varying times at 700°C was simulated by dispersed multiphase model in DICTRA. The usage of different weld metals causes different carbon concentration profiles near weld interfaces both on the P91 and 12Cr1MoV sides, driven by their carbon activity difference. Mole fractions of carbides varying with distance were investigated, showing that the formation of carbon-depleted zone (CDZ) and carbon-enriched zone (CEZ) is related to the dissolution and precipitation of M₂₃C₆ carbides. To validate the simulation results, the microstructure and hardness near the interface between P91 base and GTR-2CM weld metal were studied. Good agreements on the widths of CDZ and CEZ between modelled and experimental results were obtained.

Original language	English
Pages (from-to)	557-565
Number of pages	9
Journal	Materials at High Temperatures
Volume	32
Issue number	6
DOIs	https://doi.org/10.1179/1878641315Y.0000000002
State	Published - Nov 2015

Keywords

Aging
Carbides
Carbon diffusion
DICTRA modeling
Welding consumables

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@article{b65a0b89dba44f0db98633444c83ea10,

title = "Carbon diffusion in dissimilar joints between P91 and 12Cr1MoV steels welded by different consumables at high temperature",

abstract = "Three consumables: 9CrMoV(N), R31, and GTR-2CM are considered in welding P91 and 12Cr1MoV together. The stable phases and carbon activities of the involved materials were calculated by THERMO-CALC. Carbon diffusion after aging for varying times at 700°C was simulated by dispersed multiphase model in DICTRA. The usage of different weld metals causes different carbon concentration profiles near weld interfaces both on the P91 and 12Cr1MoV sides, driven by their carbon activity difference. Mole fractions of carbides varying with distance were investigated, showing that the formation of carbon-depleted zone (CDZ) and carbon-enriched zone (CEZ) is related to the dissolution and precipitation of M23C6 carbides. To validate the simulation results, the microstructure and hardness near the interface between P91 base and GTR-2CM weld metal were studied. Good agreements on the widths of CDZ and CEZ between modelled and experimental results were obtained.",

keywords = "Aging, Carbides, Carbon diffusion, DICTRA modeling, Welding consumables",

author = "Y. Zhao and J. Gong and X. Wang and W. Gao and Q. Li",

note = "Publisher Copyright: {\textcopyright} W. S. Maney & Son Ltd. 2015.",

year = "2015",

month = nov,

doi = "10.1179/1878641315Y.0000000002",

language = "英语",

volume = "32",

pages = "557--565",

journal = "Materials at High Temperatures",

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}

TY - JOUR

T1 - Carbon diffusion in dissimilar joints between P91 and 12Cr1MoV steels welded by different consumables at high temperature

AU - Zhao, Y.

AU - Gong, J.

AU - Wang, X.

AU - Gao, W.

AU - Li, Q.

N1 - Publisher Copyright: © W. S. Maney & Son Ltd. 2015.

PY - 2015/11

Y1 - 2015/11

N2 - Three consumables: 9CrMoV(N), R31, and GTR-2CM are considered in welding P91 and 12Cr1MoV together. The stable phases and carbon activities of the involved materials were calculated by THERMO-CALC. Carbon diffusion after aging for varying times at 700°C was simulated by dispersed multiphase model in DICTRA. The usage of different weld metals causes different carbon concentration profiles near weld interfaces both on the P91 and 12Cr1MoV sides, driven by their carbon activity difference. Mole fractions of carbides varying with distance were investigated, showing that the formation of carbon-depleted zone (CDZ) and carbon-enriched zone (CEZ) is related to the dissolution and precipitation of M23C6 carbides. To validate the simulation results, the microstructure and hardness near the interface between P91 base and GTR-2CM weld metal were studied. Good agreements on the widths of CDZ and CEZ between modelled and experimental results were obtained.

AB - Three consumables: 9CrMoV(N), R31, and GTR-2CM are considered in welding P91 and 12Cr1MoV together. The stable phases and carbon activities of the involved materials were calculated by THERMO-CALC. Carbon diffusion after aging for varying times at 700°C was simulated by dispersed multiphase model in DICTRA. The usage of different weld metals causes different carbon concentration profiles near weld interfaces both on the P91 and 12Cr1MoV sides, driven by their carbon activity difference. Mole fractions of carbides varying with distance were investigated, showing that the formation of carbon-depleted zone (CDZ) and carbon-enriched zone (CEZ) is related to the dissolution and precipitation of M23C6 carbides. To validate the simulation results, the microstructure and hardness near the interface between P91 base and GTR-2CM weld metal were studied. Good agreements on the widths of CDZ and CEZ between modelled and experimental results were obtained.

KW - Aging

KW - Carbides

KW - Carbon diffusion

KW - DICTRA modeling

KW - Welding consumables

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U2 - 10.1179/1878641315Y.0000000002

DO - 10.1179/1878641315Y.0000000002

M3 - 文章

AN - SCOPUS:84954098591

SN - 0960-3409

VL - 32

SP - 557

EP - 565

JO - Materials at High Temperatures

JF - Materials at High Temperatures

IS - 6

ER -

Carbon diffusion in dissimilar joints between P91 and 12Cr1MoV steels welded by different consumables at high temperature

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