The Microstructure and Mechanical Behavior of TRIP 800 and DP 1000 Steels Welded by Electron Beam Welding Method

Sezgin, Cihangir Tevfik; Hayat, Fatih

doi:10.1590/0104-9224/si25.26

Cited by 3 publications

(3 citation statements)

References 32 publications

(38 reference statements)

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“…The average tensile strength of the welded joints is 925 MPa under different welding parameters. The tensile strength of the dual-phase steel welded by the CMT + P welding technology is 1.4 times higher than that of the DP1000 dual-phase steel welded by the electron beam welding technology [ 15 ]. Because the CMT + P welding technology utilizes the arc as the heat source, it has the advantages of a stable welding arc, low heat input, and no spatter in the welding process.…”

Section: Discussionmentioning

confidence: 99%

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Microstructures and Properties Investigation on DP980 Dual-Phase Steel CMT + P Welded Joints

Liu

Chen

et al. 2022

Materials

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The increasing demand for the lightweight production of advanced high-strength steel puts forward higher requirements for the quality of welded joint forming. The common CMT welding process has certain limitations and is difficult to meet the needs of lightweight manufacturing. In this study, the CMT + P welding technology was used to weld the DP980 dual-phase steel plate with 1.2 mm thickness. The ER120S-G welding wire was used as the filling material to conduct a 70° angle lap welding experiment. The effects of wire feeding speed (3 m/min~5 m/min) and welding speed (350 mm/min~600 mm/min) on the forming, microstructures, and mechanical properties of DP980 dual-phase steel welded joints were analyzed. The results show that the CMT + P welding process can produce lap weldments with good formability and properties. The welded joints can be divided into the weld zone, the HAZ, and the base metal zone, where the HAZ can be divided into the coarse-grained zone and the softened zone. The role of the elements Ni and Si is to promote the production of martensite and to increase the ferrite strength in welded joints. As the wire feeding speed increases, the grain size of the coarse grain zone in the HAZ increases from 31.90 μm to 50.93 μm; while the welding speed increases, the grain size of the coarse grain zone decreases from 45.48 μm to 35.73 μm. The average microhardness of the weld zone is 420 HV. In contrast, the average microhardness of the softening zone in HAZ is reduced to 250 HV. When the wire feeding speed is 4 m/min and the welding speed is 550 mm/min, the tensile properties of the weldment are optimal, its tensile strength can reach 973 MPa, and the tensile fracture is ductile fracture.

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Section: Discussionmentioning

confidence: 99%

“…The results showed that the microhardness of the weldments varied from 221 HV to 243 HV. Sezgin et al [ 15 ] used electron beam welding technology to weld DP1000 dual-phase steel with 1.2 mm thickness. They found that the average tensile strength of the weldments was 656 MPa.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Properties Investigation on DP980 Dual-Phase Steel CMT + P Welded Joints

Liu

Chen

et al. 2022

Materials

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“…Over the past few years, numerous scholars have conducted studies on solder joints. Sezgin [19] examined the electron beam welding (EBW) method of TRIP 800 steel and DP 1000 steel and found through observation that the TRIP 800 joining absorbed more energy than the DP 1000 joining at impact notch experiment for each temperature. Emre [20] studied the impact imposed by the welding current and welding time on nugget shape, while conducting the tensile shear experiment on welding specimens in the meantime.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Compression Properties of the Resistance Spot Welding of High Strength Steels under Varying Temperature Conditions

Fan

Wang

2021

Advances in Materials Science and Engineering

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In this paper, we have studied the dynamic compression performance of the RSW of QP980 steel and TRIP800 steel by using a split Hopkinson pressure bar (SHPB), and we have also examined the fracture mode of the two research objects. It is found that the spot welding zone is primarily composed of the martensite structure, and there is a sparse defect of crystal structure adjacent to the center of nugget. In addition, there are evident gaps between the plates on both sides of the spot welding zone. Through the measurement of the microhardness of the two grade steel, it is found that the average hardness of the RSW of QP980 steel is higher than that of TRIP800 steel. There is a softening region in the interface of the heat affected zone and the substrate zone. The dynamic compression experiments are carried out on the RSW of QP980 steel and TRIP800 steel under 200°C and 300°C conditions, and it is found that the strain rate would increase with the rising temperature, but the compressive strength would experience declines. Furthermore, the sparse defects of crystal structure adjacent to the center of nugget would lead to stress rebound when the specimen is compressed. Moreover, through the observation of the fracture surface of the recovered specimens, it is found that the fracture of the nugget is brittle, whereas the fracture mode of the sample is more complicated. In addition, the fracture surface features a number of “river pattern” cleavage facets, and there are very few dimples of ductile tearing. This study is expected to have huge implications to the safety of vehicle body under high-speed impact.

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Effect of Weld Line Energy on Mechanical Properties and Formability of Cold Metal Transfer-Welded Dissimilar DP600-780 Thin Sheets

Sharan,

Chand,

Shanmugam

et al. 2024

J. of Materi Eng and Perform

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The Microstructure and Mechanical Behavior of TRIP 800 and DP 1000 Steels Welded by Electron Beam Welding Method

Cited by 3 publications

References 32 publications

Microstructures and Properties Investigation on DP980 Dual-Phase Steel CMT + P Welded Joints

Microstructures and Properties Investigation on DP980 Dual-Phase Steel CMT + P Welded Joints

Dynamic Compression Properties of the Resistance Spot Welding of High Strength Steels under Varying Temperature Conditions

Effect of Weld Line Energy on Mechanical Properties and Formability of Cold Metal Transfer-Welded Dissimilar DP600-780 Thin Sheets

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