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Influence of Annealing Treatment on Deep Drawing Behavior of Q235 Carbon Steel /410/304 Stainless Steels Three-Layer Composite Plate

Zehua Lv Zhixiong Zhang Jianchao Han Tao Wang

Archives of Metallurgy and Materials | 2022 | vol. 67 | No 2 | 421-433 | DOI: 10.24425/amm.2022.137773

Keywords composite plate deep drawing annealing microstructure

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Abstract

Effect of annealing treatment on deep drawing behavior of hot-rolled Q235 carbon steel/410/304 stainless steel three-layer composite plate was investigated. Deep drawability of the unannealed composite plates exhibits a sharp difference for various contact surfaces with the die. The limit drawing ratio (LDR) of the composite plate with the carbon steel contacting the die is 1.75, while it is 1.83 with the stainless steel contacting the die due to the different mechanical responses to the tensile stress at the corner of the die. After annealing at 900°C for 2 h, however, the deep drawabilities of the composite plates both for various contact surfaces with the die are significantly improved and becomes almost identical, which are attributed to the stress relief, the enhanced ductility and the improved interface bonding strength of the hot-rolled component plates during annealing.

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Authors and Affiliations

Zehua Lv

1 2 3

Zhixiong Zhang

1 2 3

Jianchao Han

1 2 3

Tao Wang

1 2 3

e-mail:

ORCID:

Taiyuan University of Technology, College of Mechanical and Vehicle Engineering, Taiyuan 030024, PR China
Taiyuan University of Technology, Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan 030024, PR China
Taiyuan University of Technology, Tyut-Uow Joint Research Centre, Taiyuan 030024, PR China

Ultrasonic Assisted Active-Passive Filling Friction Stir Repairing to Eliminate Volume Defects

Tao Wang Xue Gong Shude Ji Gang Xue Zan Lv

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 1 | 217-222 | DOI: 10.24425/amm.2021.134778

Keywords Friction stir repairing Magnesium alloys Defects ultrasonic Mechanical properties

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Abstract

Ultrasonic assisted active-passive filling friction stir repairing (A-PFFSR) was proposed to repair volume defects in the metallic parts. Sound joints without interfacial defects could be achieved. Firstly, the ultrasonic was beneficial to improving material flow and atom diffusion, and then eliminated kissing bond defects compared to conventional A-PFFSR joints. Secondly, the equiaxed grains were refined by ultrasonic vibration. Lastly, the repairing passes were reduced due to the ultrasonic, which decreased softening degree of the repaired joints. The maximum tensile strength of 150 MPa was achieved. Therefore, this strategy to repair the volume defects is feasibility and potential in the remanufacturing fields of aerospace and transportation.

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Authors and Affiliations

Tao Wang

e-mail:

ORCID:

Xue Gong

e-mail:

ORCID:

Shude Ji

e-mail:

ORCID:

Gang Xue

Zan Lv

Analysis of the influence of warning sounds in expressway tunnels on the mental state and attention of the driver

Yao Xiao Bo Liang Tao Wang Jiaan Niu Shiyong He

Archives of Civil Engineering | 2023 | vol. 69 | No 2 | 623-636 | DOI: 10.24425/ace.2023.145288

Keywords warning sound expressway tunnel mental states visual characteristics

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Abstract

In recent years, some expressway tunnels have started broadcasting warning sounds, such as fire alarms, to improve driver attention and traffic safety. However, there is few research on it, and in contrast to previous studies, we have considered different evaluation indices and through field measurement to determine the effectiveness of this practice. The characteristics of three warning sound signals, i.e., fire alarm, dynamic music, and voice command, in a tunnel were analyzed usingMATLAB. Considering pupil diameter and blink duration as evaluation indexes, the change in the mental state of the driver after hearing a warning sound was analyzed. Based on Markov chain theory, the change in the gaze region and gaze shift of the driver under the condition of a warning sound was analyzed. Results shows fire alarms and voice commands can increase the mental load of drivers, but the degree of impact was not determined. Dynamic music does not affect the mental load of the driver. The fire alarm and dynamic music attracted the attention of the driver; conversely, as the voice command warns the driver to focus on safety, it did not impact the attention of the driver. The research results provide a scientific reference for the selection of warning sounds in expressway tunnels and new research ideas for the prevention of traffic injuries in expressway tunnels.

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Authors and Affiliations

Yao Xiao

e-mail:

ORCID:

Bo Liang

e-mail:

ORCID:

Tao Wang

e-mail:

ORCID:

Jiaan Niu

e-mail:

ORCID:

Shiyong He

e-mail:

ORCID:

Chongqing Jiaotong University, School of Civil Engineering, Chongqing Rail Transit (Group) Co., Ltd, Xuefu Avenue 66, Nanan District, Chongqing, China
Chongqing Jiaotong University, School of Civil Engineering, State Key Laboratory of Mountain Bridge and Tunnel Engineering, Xuefu Avenue 66, Nanan District, Chongqing, China
Chongqing Industrial School, Hualongqiong, Yuzhong District, Chongqing, China
Chongqing Jiaotong University, School of Civil Engineering, Xuefu Avenue 66, Nanan District, Chongqing, China

Simulation Studies on the Influence of Other Combustible Gases on the Characteristics of Methane Explosions at Constant Volume and High Temperature

Zhenmin Luo Litao Liu Shuaishuai Gao Tao Wang Bin Su Lei Wang Yong Yang Xiufang Li

Archives of Mining Sciences | 2021 | vol. 66 | No 2 | 279-295 | DOI: 10.24425/ams.2021.137462

Keywords Constant volume Volume fraction of combustible gas Initial temperature adiabatic flame temperature Maximum explosion pressure

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Abstract

Gas explosions are major disasters in coal mining, and they typically cause a large number of deaths, injuries and property losses. An appropriate understanding of the effects of combustible gases on the characteristics of methane explosions is essential to prevent and control methane explosions. FLACS software was used to simulate an explosion of a mixture of CH4 and combustible gases (C2H4, C2H6, H2, and CO) at various mixing concentrations and different temperatures (25, 60, 100, 140 and 180℃). After adding combustible gases to methane at a constant volume and atmospheric pressure, the adiabatic flame temperature linearly increases as the initial temperature increases. Under stoichiometric conditions (9.5% CH4-air mixture), the addition of C2H4 and C2H6 has a greater effect on the adiabatic flame temperature of methane than H2 and CO at different initial temperatures. Under the fuel-lean CH4-air mixture (7% CH4-air mixture) and fuel-rich mixture (11% CH4-air mixture), the addition of H2 and CO has a greater effect on the adiabatic flame temperature of methane. In contrast, the addition of combustible gases negatively affected the maximum explosion pressure of the CH4-air mixture, exhibiting a linearly decreasing trend with increasing initial temperature. As the volume fraction of the mixed gas increases, the adiabatic flame temperature and maximum explosion pressure of the stoichiometric conditions increase. In contrast, under the fuel-rich mixture, the combustible gas slightly lowered the adiabatic flame temperature and the maximum explosion pressure. When the initial temperature was 140℃, the fuel consumption time was approximately 8-10 ms earlier than that at the initial temperature of 25℃. When the volume fraction of the combustible gas was 2.0%, the consumption time of fuel reduced by approximately 10 ms compared with that observed when the volume fraction of flammable gas was 0.4%.

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Authors and Affiliations

Zhenmin Luo

1 2

e-mail:

ORCID:

Litao Liu

1 2

e-mail:

ORCID:

Shuaishuai Gao

1 2

e-mail:

ORCID:

Tao Wang

1 2 3

e-mail:

ORCID:

Bin Su

1 2

e-mail:

ORCID:

Lei Wang

1 2

e-mail:

ORCID:

Yong Yang

4 2

e-mail:

ORCID:

Xiufang Li

e-mail:

ORCID:

Xi’an University of Science and Technology, School of Safety Science & Engineering, 58, Yanta Mid. Rd., Xi’an, 710054, Shaanxi, PR China
Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 58, Yanta Mid. Rd, Xi’an, 710054, Shaanxi, PR China
Xi’an University of Science and Technology, Postdoctoral Program, 58, Yanta Mid. Rd., Xi’an 710054, Shaanxi, PR China
Xi’an University of Science and Technology, School of Safety Science & Engineering, 58, Yanta Mid. Rd., Xi’an, 710054, Shaanxi, PR

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Influence of Annealing Treatment on Deep Drawing Behavior of Q235 Carbon Steel /410/304 Stainless Steels Three-Layer Composite Plate

Abstract

Authors and Affiliations

Ultrasonic Assisted Active-Passive Filling Friction Stir Repairing to Eliminate Volume Defects

Abstract

Authors and Affiliations

Analysis of the influence of warning sounds in expressway tunnels on the mental state and attention of the driver

Abstract

Authors and Affiliations

Simulation Studies on the Influence of Other Combustible Gases on the Characteristics of Methane Explosions at Constant Volume and High Temperature

Abstract

Bibliography

Authors and Affiliations