元素Nb对TiNbV微合金钢CGHAZ组织与冲击韧性影响

Han Yan; Di Zhao; Tongfu Qi; Xuesong Leng; Kuijun Fu; Fengya Hu

doi:10.12073/j.hjxb.20200906001

元素Nb对TiNbV微合金钢CGHAZ组织与冲击韧性影响

Translated title of the contribution: Effect of element Nb on microstructures and impact toughness of CGHAZ in TiNbV micro-alloyed steels

Han Yan
, Di Zhao
, Tongfu Qi
, Xuesong Leng
, Kuijun Fu^*
, Fengya Hu

^*Corresponding author for this work

Harbin Institute of Technology
University of Sheffield
Iron & Steel Research Institute of Ansteel Group Corporation

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

3 Scopus citations

Abstract

The microstructure evolution and impact toughness of the coarse grain heat-affected-zone (CGHAZ) of TiNbV micro-alloyed steel were investigated by the simulated welding thermal cycle. The microstructure and grain size of the simulated CGHAZ between low-niobium steel and high-niobium steel is significantly different. When the Nb content is low (0.005%), the CGHAZ consists of ferrite, acicular ferrite, and pearlite. The ratio of the large-angle grain boundary and the small-angle grain boundary is equal, and the grain size of the CGHAZ is coarse and uneven. With the increase of Nb content, the number of grains in the high-angle grain boundary increases, and the grains are refined. However, the formation of acicular ferrite is suppressed, and the bainite content of CGHAZ increases. The formation of bainite in the micro-alloyed steel plays a leading role in the decrease of the impact toughness of CGHAZ. The content of element Nb should be controlled within an appropriate range (~ 0.02%) to obtain good impact toughness.

Translated title of the contribution	Effect of element Nb on microstructures and impact toughness of CGHAZ in TiNbV micro-alloyed steels
Original language	Chinese (Traditional)
Pages (from-to)	33-37
Number of pages	5
Journal	Hanjie Xuebao/Transactions of the China Welding Institution
Volume	41
Issue number	12
DOIs	https://doi.org/10.12073/j.hjxb.20200906001
State	Published - 25 Dec 2020
Externally published	Yes

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@article{8ff1158c657640b4b32edbb2bb7ed83d,

title = "元素Nb对TiNbV微合金钢CGHAZ组织与冲击韧性影响",

abstract = "The microstructure evolution and impact toughness of the coarse grain heat-affected-zone (CGHAZ) of TiNbV micro-alloyed steel were investigated by the simulated welding thermal cycle. The microstructure and grain size of the simulated CGHAZ between low-niobium steel and high-niobium steel is significantly different. When the Nb content is low (0.005\%), the CGHAZ consists of ferrite, acicular ferrite, and pearlite. The ratio of the large-angle grain boundary and the small-angle grain boundary is equal, and the grain size of the CGHAZ is coarse and uneven. With the increase of Nb content, the number of grains in the high-angle grain boundary increases, and the grains are refined. However, the formation of acicular ferrite is suppressed, and the bainite content of CGHAZ increases. The formation of bainite in the micro-alloyed steel plays a leading role in the decrease of the impact toughness of CGHAZ. The content of element Nb should be controlled within an appropriate range (\textasciitilde{} 0.02\%) to obtain good impact toughness.",

keywords = "Coarse grain heat-affected-zone, Element Nb, Impact toughness, Microstructure, TiNbV micro-alloyed steel",

author = "Han Yan and Di Zhao and Tongfu Qi and Xuesong Leng and Kuijun Fu and Fengya Hu",

year = "2020",

month = dec,

day = "25",

doi = "10.12073/j.hjxb.20200906001",

language = "繁体中文",

volume = "41",

pages = "33--37",

journal = "Hanjie Xuebao/Transactions of the China Welding Institution",

issn = "0253-360X",

publisher = "Harbin Research Institute of Welding",

number = "12",

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T1 - 元素Nb对TiNbV微合金钢CGHAZ组织与冲击韧性影响

AU - Yan, Han

AU - Zhao, Di

AU - Qi, Tongfu

AU - Leng, Xuesong

AU - Fu, Kuijun

AU - Hu, Fengya

PY - 2020/12/25

Y1 - 2020/12/25

N2 - The microstructure evolution and impact toughness of the coarse grain heat-affected-zone (CGHAZ) of TiNbV micro-alloyed steel were investigated by the simulated welding thermal cycle. The microstructure and grain size of the simulated CGHAZ between low-niobium steel and high-niobium steel is significantly different. When the Nb content is low (0.005%), the CGHAZ consists of ferrite, acicular ferrite, and pearlite. The ratio of the large-angle grain boundary and the small-angle grain boundary is equal, and the grain size of the CGHAZ is coarse and uneven. With the increase of Nb content, the number of grains in the high-angle grain boundary increases, and the grains are refined. However, the formation of acicular ferrite is suppressed, and the bainite content of CGHAZ increases. The formation of bainite in the micro-alloyed steel plays a leading role in the decrease of the impact toughness of CGHAZ. The content of element Nb should be controlled within an appropriate range (~ 0.02%) to obtain good impact toughness.

AB - The microstructure evolution and impact toughness of the coarse grain heat-affected-zone (CGHAZ) of TiNbV micro-alloyed steel were investigated by the simulated welding thermal cycle. The microstructure and grain size of the simulated CGHAZ between low-niobium steel and high-niobium steel is significantly different. When the Nb content is low (0.005%), the CGHAZ consists of ferrite, acicular ferrite, and pearlite. The ratio of the large-angle grain boundary and the small-angle grain boundary is equal, and the grain size of the CGHAZ is coarse and uneven. With the increase of Nb content, the number of grains in the high-angle grain boundary increases, and the grains are refined. However, the formation of acicular ferrite is suppressed, and the bainite content of CGHAZ increases. The formation of bainite in the micro-alloyed steel plays a leading role in the decrease of the impact toughness of CGHAZ. The content of element Nb should be controlled within an appropriate range (~ 0.02%) to obtain good impact toughness.

KW - Coarse grain heat-affected-zone

KW - Element Nb

KW - Impact toughness

KW - Microstructure

KW - TiNbV micro-alloyed steel

UR - https://www.scopus.com/pages/publications/85100455933

U2 - 10.12073/j.hjxb.20200906001

DO - 10.12073/j.hjxb.20200906001

M3 - 文章

AN - SCOPUS:85100455933

SN - 0253-360X

VL - 41

SP - 33

EP - 37

JO - Hanjie Xuebao/Transactions of the China Welding Institution

JF - Hanjie Xuebao/Transactions of the China Welding Institution

IS - 12

ER -

元素Nb对TiNbV微合金钢CGHAZ组织与冲击韧性影响

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