Behavior of High Strength Steel Butt Joints at Arctic Low Temperatures

doi:10.16183/j.cnki.jsjtu.2023.386

Abstract

Abstract:

To study the effect of Arctic low temperatures on the behavior of HG785 high strength steel butt joints, the microstructure observation, hardness distribution tests, and uniaxial tensile tests were performed on the butt joints fabricated by using two types of weld metals with exposure to five ambient and low temperatures. The results show that the butt joints possess a coherent metallographic structure and exhibit good fusion between weld metal and base metal. Only a softening heat affected zone is observed in the weld joint samples under two matching conditions. The butt joint tensile specimens exposed to Arctic low temperatures possess higher strengths compared to those at ambient temperatures. The ductility improvement due to low-temperature exposure for equal-matching welded butt joint is substantial, whilst that for over-matching welded butt joints is negligible. All butt joint tensile specimens fail in a ductile manner. The findings provide a scientific basis for the engineering applications of high strength steel structures in Arctic low-temperature regions.

Key words: high strength steel, butt joint, microstructure observation, hardness test, low temperature mechanical properties

CLC Number:

TU391

CAO Huan, CAI Ao, CHEN Yangyu, ZUO Wenkang, CHEN Mantai. Behavior of High Strength Steel Butt Joints at Arctic Low Temperatures[J]. Journal of Shanghai Jiao Tong University, 2025, 59(4): 533-540.

Figures/Tables 11

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化学成分	质量分数/%	化学成分	质量分数/%
C	0.09	Nb	—
Si	0.07	Ti	—
Mn	1.81	V	—
S	0.001	Ni	0.01
P	0.01	Al	—
Cr	0.13	Cu	—
Mo	0.17

化学成分	质量分数/%
化学成分	ER100S-G	ER120S-G
C	0.070	0.079
S	0.007	0.004
Mn	1.54	1.74
Si	0.59	0.70
P	0.011	0.011
Cr	0.66	0.40
Ni	0.27	2.24
Mo	0.13	0.57
Cu	0.10	0.09
Ti	0.200	0.085

试件	σ_0.2/MPa	σ_u/MPa	ε_f/%	$σ 0.2 σ 0.2, B$	$σ u σ u, B$	$ε f ε f, B$	$σ 0.2 σ 0.2, W$	$σ u σ u, W$	$ε f ε f, W$	$σ 0.2 σ 0.2, a$	$σ u σ u, a$	$ε f ε f, a$
H8W0T25	653.6	764.6	10.6	1.04	1.09	0.55	0.91	0.97	0.46	1.00	1.00	1.00
H8W0T25R	655.8	765.3	12.4	1.05	1.09	0.64	0.92	0.97	0.54	1.00	1.00	1.00
H8W0T-20	662.2	799.8	16.5	0.97	1.00	0.67	0.91	0.94	0.69	1.01	1.05	1.43
H8W0T-40	661.8	815.2	18.1	1.02	1.09	0.76	0.90	0.95	0.70	1.01	1.07	1.57
H8W0T-60	664.9	836.7	19.3	1.00	1.06	0.80	0.90	0.96	0.69	1.02	1.09	1.68
H8W0T-75	678.8	861.9	16.9	0.93	1.00	0.66	0.91	0.96	0.70	1.04	1.13	1.47
H8W2T25	708.0	788.0	21.1	1.13	1.12	1.09	0.86	0.82	1.20	1.00	1.00	1.00
H8W2T25R	704.2	786.5	19.8	1.12	1.12	1.02	0.86	0.81	1.13	1.00	1.00	1.00
H8W2T-20	699.9	775.1	17.9	1.02	0.97	0.72	0.84	0.77	0.97	0.99	0.98	0.88
H8W2T-40	706.6	801.8	21.2	1.09	1.08	0.89	0.85	0.77	1.18	1.00	1.02	1.04
H8W2T-60	726.3	858.8	21.0	1.10	1.09	0.87	0.84	0.81	1.15	1.03	1.09	1.03
H8W2T-75	741.5	873.0	22.4	1.02	1.01	0.88	0.86	0.81	1.24	1.05	1.11	1.10