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. 2022 Jan 20;15(3):768.
doi: 10.3390/ma15030768.

Effect of Different Ultrasonic Power on the Properties of RHA Steel Welded Joints

Peng Yin  1 , Chunguang Xu  1 , Qinxue Pan  1 , Wenjun Zhang  1 , Xiaowei Jiang  1   2
Affiliations

Effect of Different Ultrasonic Power on the Properties of RHA Steel Welded Joints

Peng Yin et al. Materials (Basel). .

Abstract

Based on the changes of microhardness, tensile strength, and impact resistance caused by the difference of macroscopic morphology and microstructure of welded joints, this paper studied the effect of different ultrasonic power on the properties of welded joints during the welding of homogeneous armor steel. It is experimentally found that the macroscopic morphology of those joints is very different. Compared with conventional welding, ultrasonic welding can increase the weld depth and the width of the heat-affected zone (HAZ) on either side of the weld. However, only the ultrasonic wave at an appropriate power level can increase the weld width. In addition, appropriate ultrasonic power can significantly improve the grain state of the weld. With the increase of ultrasonic power, the grain size in HAZ will decrease. The microhardness of the weld will first increase and then decrease, while the microhardness of the HAZ will increase. This is basically consistent with the changing trend of impact resistance. An ultrasonic wave can also increase the tensile strength of a welded joint up to 802 MPa, 12.4% higher than that in conventional welding. However, a high-power ultrasonic wave will bring down the tensile strength. This study provides guidance for the selection of ultrasonic-assisted regulation power to achieve the different properties of homogeneous armor steel joints.

Keywords: homogeneous armor steel; mechanical properties; microstructure; power; ultrasonic wave.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Microstructure of base mental.
Figure 2
Figure 2
Physical configuration and overall sketch of test system.
Figure 3
Figure 3
Parameters of the ultrasonic waves applied during welding.
Figure 4
Figure 4
Sketch of experimental sample.
Figure 5
Figure 5
Positions of macroscopic deformation zones of a welded joint.
Figure 6
Figure 6
Macro-profile and size of a weld.
Figure 7
Figure 7
Weld microstructure: (a–f) U0–U5, respectively.
Figure 8
Figure 8
HAZ microstructure: (a–f) U0–U5.
Figure 9
Figure 9
Microhardness distribution in a welded joint.
Figure 10
Figure 10
Tensile curves and tensile strength of the samples in different states.
Figure 11
Figure 11
SEM picture of the fracture of a tensile sample: (a–f) U0–U5, respectively; 1 and 2 correspond to tensile specimen No. 1 and tensile specimen No. 2, respectively.
Figure 12
Figure 12
EDS energy spectrum analysis: (a,c,e) the fractures and EDS zones of the No. 1 sample at U0, U3, and U5, respectively; (b,d,f) the EDS energy spectra of the U0, U3, and U5 welds, respectively.
Figure 13
Figure 13
Effect of ultrasonic wave on element segregation.
Figure 14
Figure 14
Impact absorption energy of different welded joints: (a) impact absorption energy of WZ; (b) impact absorption energy of HAZ.
See this image and copyright information in PMC

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