Effect of Alloying Elements in Steels on the Interfacial Structure and Mechanical Properties of Mg to Steel by Laser-GTAW Hybrid Direct Lap Welding
Mg alloy AZ31B was directly bonded to SK7 with a low alloy content, DP980 with a high Mn content, 316L with a high Cr and high Ni content by laser-gas tungsten arc welding (GTAW) and hybrid direct lap welding. The results showed that the tensile loads of AZ31B/SK7 and AZ31B/DP980 joints were 283 N/m...
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MDPI AG
2024-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/17/7/1624 |
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| author | Xin Liu Qiang Lang Jifeng Wang Gang Song Liming Liu |
| author_facet | Xin Liu Qiang Lang Jifeng Wang Gang Song Liming Liu |
| author_sort | Xin Liu |
| collection | DOAJ |
| description | Mg alloy AZ31B was directly bonded to SK7 with a low alloy content, DP980 with a high Mn content, 316L with a high Cr and high Ni content by laser-gas tungsten arc welding (GTAW) and hybrid direct lap welding. The results showed that the tensile loads of AZ31B/SK7 and AZ31B/DP980 joints were 283 N/mm and 285 N/mm respectively, while the tensile load of AZ31B/316L joint was only 115 N/mm. The fracture and interface microstructures were observed using scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and identified through X-ray diffractometry (XRD). For AZ31B/SK7 and AZ31B/DP980, the interface of the front reaction area and the keyhole reaction area was mainly composed of an Fe-Al phase and an Al-Mn phase. However, for AZ31B/316L, the interface of the keyhole reaction area was mainly composed of an Fe-Al phase and an Al-Mn phase, but a multi-layer composite structure consisting of the Mg<sub>17</sub>Al<sub>12</sub> compound layer and eutectic layer was formed in the front reaction area, which led to a deterioration in the joint property. The influencing mechanism of Mn, Cr and Ni elements in steel on the properties and interface structure of the laser-GTAW lap joint between the Mg alloy and the steel was systematically analyzed. |
| first_indexed | 2024-04-24T10:40:23Z |
| format | Article |
| id | doaj.art-a8c1a9b2ff7f48de95b1e428c8f504ae |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-24T10:40:23Z |
| publishDate | 2024-04-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-a8c1a9b2ff7f48de95b1e428c8f504ae2024-04-12T13:22:09ZengMDPI AGMaterials1996-19442024-04-01177162410.3390/ma17071624Effect of Alloying Elements in Steels on the Interfacial Structure and Mechanical Properties of Mg to Steel by Laser-GTAW Hybrid Direct Lap WeldingXin Liu0Qiang Lang1Jifeng Wang2Gang Song3Liming Liu4School of Materials Science and Engineering, Dalian University of Technology, Dalian 116000, ChinaSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116000, ChinaShanghai Institute of Special Equipment Inspection and Technical Research, Shanghai 200062, ChinaSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116000, ChinaSchool of Materials Science and Engineering, Dalian University of Technology, Dalian 116000, ChinaMg alloy AZ31B was directly bonded to SK7 with a low alloy content, DP980 with a high Mn content, 316L with a high Cr and high Ni content by laser-gas tungsten arc welding (GTAW) and hybrid direct lap welding. The results showed that the tensile loads of AZ31B/SK7 and AZ31B/DP980 joints were 283 N/mm and 285 N/mm respectively, while the tensile load of AZ31B/316L joint was only 115 N/mm. The fracture and interface microstructures were observed using scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and identified through X-ray diffractometry (XRD). For AZ31B/SK7 and AZ31B/DP980, the interface of the front reaction area and the keyhole reaction area was mainly composed of an Fe-Al phase and an Al-Mn phase. However, for AZ31B/316L, the interface of the keyhole reaction area was mainly composed of an Fe-Al phase and an Al-Mn phase, but a multi-layer composite structure consisting of the Mg<sub>17</sub>Al<sub>12</sub> compound layer and eutectic layer was formed in the front reaction area, which led to a deterioration in the joint property. The influencing mechanism of Mn, Cr and Ni elements in steel on the properties and interface structure of the laser-GTAW lap joint between the Mg alloy and the steel was systematically analyzed.https://www.mdpi.com/1996-1944/17/7/1624Mg/steel weldinglaser-GTAW hybrid direct lap weldinginterfacial structuremechanical properties |
| spellingShingle | Xin Liu Qiang Lang Jifeng Wang Gang Song Liming Liu Effect of Alloying Elements in Steels on the Interfacial Structure and Mechanical Properties of Mg to Steel by Laser-GTAW Hybrid Direct Lap Welding Materials Mg/steel welding laser-GTAW hybrid direct lap welding interfacial structure mechanical properties |
| title | Effect of Alloying Elements in Steels on the Interfacial Structure and Mechanical Properties of Mg to Steel by Laser-GTAW Hybrid Direct Lap Welding |
| title_full | Effect of Alloying Elements in Steels on the Interfacial Structure and Mechanical Properties of Mg to Steel by Laser-GTAW Hybrid Direct Lap Welding |
| title_fullStr | Effect of Alloying Elements in Steels on the Interfacial Structure and Mechanical Properties of Mg to Steel by Laser-GTAW Hybrid Direct Lap Welding |
| title_full_unstemmed | Effect of Alloying Elements in Steels on the Interfacial Structure and Mechanical Properties of Mg to Steel by Laser-GTAW Hybrid Direct Lap Welding |
| title_short | Effect of Alloying Elements in Steels on the Interfacial Structure and Mechanical Properties of Mg to Steel by Laser-GTAW Hybrid Direct Lap Welding |
| title_sort | effect of alloying elements in steels on the interfacial structure and mechanical properties of mg to steel by laser gtaw hybrid direct lap welding |
| topic | Mg/steel welding laser-GTAW hybrid direct lap welding interfacial structure mechanical properties |
| url | https://www.mdpi.com/1996-1944/17/7/1624 |
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