Low temperature impact toughness of high strength structural steel

Lewei Tong; Lichao Niu; Shuang Jing; Liwen Ai; Xiao Ling Zhao

doi:10.1016/j.tws.2018.09.009

Low temperature impact toughness of high strength structural steel

Lewei Tong, Lichao Niu, Shuang Jing, Liwen Ai, Xiao Ling Zhao

Research output: Journal article publication › Journal article › Academic research › peer-review

63 Citations (Scopus)

Abstract

Impact toughness properties of four kinds of high strength steel (HSS) were investigated with the nominal yield strength 460, 690, 800 and 960 MPa, respectively. The specialty of impact toughness among base metal, heat affected zone (HAZ) and weld metal were also compared and discussed. The correlations between the impact toughness of HSS and their nominal yield strength, plate thicknesses, testing temperature, welding methods were further studied. Combined with the scanning electron microscope (SEM) fracture surface observation, the microstructural features and corresponding fracture mechanisms have been analyzed. The results show that the impact toughness for HSS base metal deteriorated with the increasing nominal yield strength. The impact toughness of weld metal for HSS is much lower than that of the corresponding base metal. The impact performance of HAZ is discretized due to the welding thermal cycling on the HAZ where significant changes in grain structure and properties occur. The microcosmic fracture surface of HSS is examined to explain the reduction in impact performance under low temperature.

Original language	English
Pages (from-to)	410-420
Number of pages	11
Journal	Thin-Walled Structures
Volume	132
DOIs	https://doi.org/10.1016/j.tws.2018.09.009
Publication status	Published - Nov 2018
Externally published	Yes

Keywords

Base metal
Ductile-brittle transition temperature (DBTT)
Heat affected zone (HAZ)
High strength steel
Impact toughness
Low temperature
Weld metal

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Mechanical Engineering

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10.1016/j.tws.2018.09.009

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title = "Low temperature impact toughness of high strength structural steel",

abstract = "Impact toughness properties of four kinds of high strength steel (HSS) were investigated with the nominal yield strength 460, 690, 800 and 960 MPa, respectively. The specialty of impact toughness among base metal, heat affected zone (HAZ) and weld metal were also compared and discussed. The correlations between the impact toughness of HSS and their nominal yield strength, plate thicknesses, testing temperature, welding methods were further studied. Combined with the scanning electron microscope (SEM) fracture surface observation, the microstructural features and corresponding fracture mechanisms have been analyzed. The results show that the impact toughness for HSS base metal deteriorated with the increasing nominal yield strength. The impact toughness of weld metal for HSS is much lower than that of the corresponding base metal. The impact performance of HAZ is discretized due to the welding thermal cycling on the HAZ where significant changes in grain structure and properties occur. The microcosmic fracture surface of HSS is examined to explain the reduction in impact performance under low temperature.",

keywords = "Base metal, Ductile-brittle transition temperature (DBTT), Heat affected zone (HAZ), High strength steel, Impact toughness, Low temperature, Weld metal",

author = "Lewei Tong and Lichao Niu and Shuang Jing and Liwen Ai and Zhao, {Xiao Ling}",

note = "Funding Information: The authors are grateful for the support from National Natural Science Foundation of China (No. 51778457 ) and from the Shanghai Civil Engineering Peak Discipline Program of Shanghai Municipal Education Commission (No. TMGFXK-2015 ). Funding Information: The authors are grateful for the support from National Natural Science Foundation of China (No. 51778457) and from the Shanghai Civil Engineering Peak Discipline Program of Shanghai Municipal Education Commission (No. TMGFXK-2015). Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = nov,

doi = "10.1016/j.tws.2018.09.009",

language = "English",

volume = "132",

pages = "410--420",

journal = "Thin-Walled Structures",

issn = "0263-8231",

publisher = "Elsevier Ltd",

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TY - JOUR

T1 - Low temperature impact toughness of high strength structural steel

AU - Tong, Lewei

AU - Niu, Lichao

AU - Jing, Shuang

AU - Ai, Liwen

AU - Zhao, Xiao Ling

N1 - Funding Information: The authors are grateful for the support from National Natural Science Foundation of China (No. 51778457 ) and from the Shanghai Civil Engineering Peak Discipline Program of Shanghai Municipal Education Commission (No. TMGFXK-2015 ). Funding Information: The authors are grateful for the support from National Natural Science Foundation of China (No. 51778457) and from the Shanghai Civil Engineering Peak Discipline Program of Shanghai Municipal Education Commission (No. TMGFXK-2015). Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/11

Y1 - 2018/11

N2 - Impact toughness properties of four kinds of high strength steel (HSS) were investigated with the nominal yield strength 460, 690, 800 and 960 MPa, respectively. The specialty of impact toughness among base metal, heat affected zone (HAZ) and weld metal were also compared and discussed. The correlations between the impact toughness of HSS and their nominal yield strength, plate thicknesses, testing temperature, welding methods were further studied. Combined with the scanning electron microscope (SEM) fracture surface observation, the microstructural features and corresponding fracture mechanisms have been analyzed. The results show that the impact toughness for HSS base metal deteriorated with the increasing nominal yield strength. The impact toughness of weld metal for HSS is much lower than that of the corresponding base metal. The impact performance of HAZ is discretized due to the welding thermal cycling on the HAZ where significant changes in grain structure and properties occur. The microcosmic fracture surface of HSS is examined to explain the reduction in impact performance under low temperature.

AB - Impact toughness properties of four kinds of high strength steel (HSS) were investigated with the nominal yield strength 460, 690, 800 and 960 MPa, respectively. The specialty of impact toughness among base metal, heat affected zone (HAZ) and weld metal were also compared and discussed. The correlations between the impact toughness of HSS and their nominal yield strength, plate thicknesses, testing temperature, welding methods were further studied. Combined with the scanning electron microscope (SEM) fracture surface observation, the microstructural features and corresponding fracture mechanisms have been analyzed. The results show that the impact toughness for HSS base metal deteriorated with the increasing nominal yield strength. The impact toughness of weld metal for HSS is much lower than that of the corresponding base metal. The impact performance of HAZ is discretized due to the welding thermal cycling on the HAZ where significant changes in grain structure and properties occur. The microcosmic fracture surface of HSS is examined to explain the reduction in impact performance under low temperature.

KW - Base metal

KW - Ductile-brittle transition temperature (DBTT)

KW - Heat affected zone (HAZ)

KW - High strength steel

KW - Impact toughness

KW - Low temperature

KW - Weld metal

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U2 - 10.1016/j.tws.2018.09.009

DO - 10.1016/j.tws.2018.09.009

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AN - SCOPUS:85053318996

SN - 0263-8231

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ER -

Low temperature impact toughness of high strength structural steel

Abstract

Keywords

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