The effect of Zn coating layer on the microstructure and mechanical properties of friction stir spot welded galvanized DP590 high-strength steel plates

Rong, Zeyu; Li, Linqing; Chen, Lianfeng; Yuan, Haonan; Zhu, Shijie; Sun, Yingjuan; Guan, Shaokang

doi:10.1007/s00170-021-06728-w

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…It was revealed in work by Kim et al [42] that the heat produced at the shoulder interface and the BM is more than the pin-affected region. Ac 1 and Ac 3 phase transition temperatures of DP590 steel were estimated to be 745 °C and 860 °C, respectively [25]. The peak temperature of the SZ of both the joints produced is higher than the Ac 3 temperature of the material.…”

Section: Thermal History Of Fslw and Fsslw Jointsmentioning

confidence: 93%

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Friction stir lap joining techniques effects on microstructure and tensile properties of high-strength automotive steel top hat sections

Varadan¹,

Lakshminarayanan²

2023

Mater. Res. Express

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Dual Phase (DP) steel, a type of Advanced High Strength Steel (AHSS) with a thickness of 1.7 mm, is used to fabricate single-hat components that are then joined to the base plate using two friction stir welding processes: friction stir lap welding (FSLW) and friction stir spot lap welding (FSSLW). It is difficult to join this assembly using fusion welding techniques. The welding variables for the FSLW process, tool rotation speed (TRS), tool traverse speed (TTS), and plunge depth (PD), were optimized using the design of an experiments-based response surface method by experimentally measured tensile shear failure load (TFL) of top hat assembly. For the FSSLW process, the welding variable TTS was replaced by dwell time (DT). Peak temperature, microstructure at different zones, microhardness mapping, and energy absorption capacity of both processes were evaluated under optimal welding conditions. For both processes, the stir zone and the heat-affected zone had the highest and lowest microhardness, which can be correlated with the level of martensite tempering, martensite lath spacing, polygonal ferrite volume, and precipitated carbides. Under optimum welding conditions, the TSL and energy absorption of FSLW joints were 14 kN and 170 J, respectively, which is 20% and 47 higher than the TSL and energy absorption of FSSLW joints

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Section: Thermal History Of Fslw and Fsslw Jointsmentioning

confidence: 93%

“…They concluded that the heat input needed to be regulated to make high-quality joints. When using FSSLW to join Zn-coated DP590 steel, Rong et al [25] showed that the shoulder depth required to be controlled to achieve the desired distribution of Zn at the joint interface and achieve the highest failure load.…”

Section: Introductionmentioning

confidence: 99%

Friction stir lap joining techniques effects on microstructure and tensile properties of high-strength automotive steel top hat sections

Varadan¹,

Lakshminarayanan²

2023

Mater. Res. Express

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“…Weld metal properties, however, can be improved by inclusions which are known as the nucleation of acicular ferrite. In the weld metal, MnS, V(C,N) TiN, TiO, Ti 2 O 3 have been reported to be effective nucleation sites for acicular ferrite (AF) grains [10][11][12][13][14][15]. Inclusions such as MnS and TiN have a lattice structure similar to that of AF, with a lattice mismatch of less than 10%, thus serving as external nucleation sites for the development of AF.…”

Section: Introductionmentioning

confidence: 99%

Observation of inclusions and intra-granular ferrite evolutions at the HAZ of low-carbon steel with different thermal histories

Nguyen,

Nam,

Nhung

et al. 2024

Mater. Res. Express

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This study investigated the formation and growth of intra-granular ferrite with inclusions (TiN, MnS) in the heat-affected zone (HAZ) of a welding joint in low-carbon steels. The relationship between the cooling rate and the density and size of inclusions was analyzed. An orientation relationship akin to the Baker–Nutting relationship was identified between TiN and ferrite, while the orientation relationship between MnS and ferrite approximated the Kurdjumov–Sachs relationship. At low cooling rates, in the absence of nucleation support from TiN and MnS inclusions, the microstructure in the HAZ comprised Widmanstätten ferrite. Additionally, the shape, size, and density of primary ferrites and Widmanstätten ferrite in steels were influenced by sulfur content.

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“…Similar to friction stir welding (FSW) and friction stir spot welding (FSSW) (Xie et al , 2022; Chu et al , 2018b; Rong et al , 2021; Zou et al , 2021), the source, the degree of thermo-mechanically action and mechanical properties of each micro-zone solder with different microstructure characteristics in FPMW joints are closely related to the flow behavior of solder during welding. In the macro-scale friction plunge welding (MSFPW) technology, the welding part of the hard weldment is processed into a stepped shaft shape, as shown in Figure 1(c).…”

Section: Introductionmentioning

confidence: 99%

Flow behavior during solder/Cu column friction plunge micro-welding

Zhao,

Zhang,

Meng

et al. 2023

SSMT

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Purpose The author proposed a friction plunge micro-welding (FPMW) method and applied it to column grid array packaging to realize the connection of copper columns without precision molds assisted positioning. The purpose of this paper is to study the flow behavior of the solder undergoing frictional thermo-mechanical action during the FPMW and to determine the source of the solders in the micro-zones with different microstructure characteristics near the solder/Cu column friction interface. Design/methodology/approach Three kinds of Sn58Bi/SAC305 and SAC305/Pb90Sn composite solder samples were designed to study the flow behavior of the solder during FPMW using Bi and Pb as tracer elements. Findings The results show that most of the solders in the position occupied by the copper column was softened and plasticized during the welding process and was extruded to side of the copper column, flowing axially, circumferentially and radially along a trajectory similar to a conical spiral line. Under the drive of the tangential friction force and the radial hold-tight force, the extruded out visco-plastic solders fully mixed with the visco-plastic solders on the sides of the copper column, and bonded with the solders that deformed plastically on the periphery, so that a stir zone and a dynamic recrystallization zone finally evolved. The outside plastically deformed solders evolved into a thermo-mechanical affected zone. Originality/value The flow behavior of the solder during the FPMW was determined, as well as the source of the solders in micro-zones with different microstructure characteristics.

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The effect of Zn coating layer on the microstructure and mechanical properties of friction stir spot welded galvanized DP590 high-strength steel plates

Cited by 6 publications

References 32 publications

Friction stir lap joining techniques effects on microstructure and tensile properties of high-strength automotive steel top hat sections

Friction stir lap joining techniques effects on microstructure and tensile properties of high-strength automotive steel top hat sections

Observation of inclusions and intra-granular ferrite evolutions at the HAZ of low-carbon steel with different thermal histories

Flow behavior during solder/Cu column friction plunge micro-welding

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