The effect of martensitic transformation on residual stress in resistance spot welded high-strength steel sheets

Iyota, Muneyoshi; Mikami, Yoshiki; Hashimoto, Tadafumi; Taniguchi, Koichi; Ikeda, Rinsei; Mochizuki, Masahito

doi:10.1016/j.jallcom.2012.06.109

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…In ref. [ 19 ] the welding current was 6.0 kA, the electrode force 3.5 kN and the welding time 280 ms, while in the present case the welding current was 6.6 kA, the electrode force 4.5 kN, and the welding time 380 ms (configuration 23 in Table 2 ). Hence, the comparison can only be qualitative.…”

Section: Resultsmentioning

confidence: 54%

“…However, the measured radial stress σr and tangential stress σt along a radial path at the sheet surface compare in their trends well to the results of the current model. Iyota et al measured local positive minima at a distance of about 2.1 mm from the centre while local positive maxima were shown at Measured residual stress distributions for the radial stress σ r and the tangential stress σ t were found in the literature of Iyota et al [19] for a HT980 steel grade. In that paper, the used sheet thickness of 1.6 is the same but the welding parameters differ with respect to the present investigation.…”

Section: Resultsmentioning

confidence: 83%

“…Measured residual stress distributions for the radial stress σ r and the tangential stress σ t were found in the literature of Iyota et al [ 19 ] for a HT980 steel grade. In that paper, the used sheet thickness of 1.6 is the same but the welding parameters differ with respect to the present investigation.…”

Section: Resultsmentioning

confidence: 98%

“…The literature reports on a number of FE models of RSW processes [12][13][14][15][16]. In most of those publications only the electrical-thermal-mechanical coupling is considered, whereas the metallurgical and mechanical effects of phase transformations are not covered [17] or only dealt with by applying some simplifications [18,19]. Since the LMC forms during the heating phase of the process while the centre of the spot weld has already melted and consequently the adjacent area has transformed from the base microstructure to austenite [10], the effects of the phase transformation must not be neglected.…”

Section: Introductionmentioning

confidence: 99%

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Validated Multi-Physical Finite Element Modelling of the Spot Welding Process of the Advanced High Strength Steel DP1200HD

et al. 2021

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Resistance spot welding (RSW) is a common joining technique in the production of car bodies in white for example, because of its high degree of automation, its short process time, and its reliability. While different steel grades and even dissimilar metals can be joined with this method, the current paper focuses on similar joints of galvanized advanced high strength steel (AHSS), namely dual phase steel with a yield strength of 1200 MPa and high ductility (DP1200HD). This material offers potential for light-weight design. The current work presents a multi-physical finite element (FE) model of the RSW process which gives insights into the local loading and material state, and which forms the basis for future investigations of the local risk of liquid metal assisted cracking and the effect of different process parameters on this risk. The model covers the evolution of the electrical, thermal, mechanical, and metallurgical fields during the complete spot welding process. Phase transformations like base material to austenite and further to steel melt during heating and all relevant transformations while cooling are considered. The model was fully parametrized based on lab scale material testing, accompanying model-based parameter determination, and literature data, and was validated against a large variety of optically inspected burst opened spot welds and micrographs of the welds.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Validated Multi-Physical Finite Element Modelling of the Spot Welding Process of the Advanced High Strength Steel DP1200HD

et al. 2021

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“…The peak tensile stress of 627 MPa arises 1.5 mm below the fusion boundary in the untempered rail. Similarly, Iyota et al [ 37 ] reported tensile stresses in the HAZ after spot-welding high-strength steel sheets due to a martensitic transformation. Beyond the HAZ, the rail substrate is not exposed to these large thermal gradients and rapid cooling rates which facilitate the formation of martensite; therefore, the magnitude of the tensile stress decreases with increasing pearlite content and the stress state neutralises further away from the HAZ.…”

Section: Discussionmentioning

confidence: 96%

Application of a New Alloy and Post Processing Procedures for Laser Cladding Repairs on Hypereutectoid Rail Components

et al. 2022

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The development of a laser cladding repair strategy is critical for the continued growth of heavy-haul railway networks. Premium hypereutectoid rails have undergone laser cladding using a new martensitic stainless-steel alloy, 415SS, developed for high carbon rails after standard cladding metals were found to be incompatible. Non-destructive neutron diffraction techniques were used to measure the residual stress in different layers generated across a dissimilar metal joint during laser cladding. The internal stress distribution across the cladding, heat-affected zone (HAZ), and substrate was measured in the untempered rail, after 350 °C and 540 °C heat treatment procedures and two surface grinding operations. The martensitic 415SS depositions produce compressive stress in the cladding, regardless of tempering procedures, which may inhibit fatigue crack propagation whilst grinding operations locally relive surface stress. Balancing tensile stresses were recorded below the fusion boundary in the HAZ due to thermal gradients altering the microstructure. The combination of 540 °C tempering and 0.5 mm surface layer removal produced a desirable combination of compression in the cladding deposition with significantly reduced tensile stresses in the HAZ. A comparison with the current literature shows that this alloy achieves a unique combination of desirable hardness, low tensile stress, and compression in the cladding layer. Data obtained during strain scanning has been used to determine the location of microstructural changes at the fusion boundary and HAZ through correlation of the stress, strain, full width at half maximum (FWHM), and intensity profiles. Therefore, neutron diffraction can be used for both the accurate measurement of internal residual stress and to obtain microstructural information of a metallurgical join non-destructively.

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Numerical modeling from process to residual stress induced in resistance spot welding of DP980 steel

Ren

Huang

et al. 2023

Int J Adv Manuf Technol

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The effect of martensitic transformation on residual stress in resistance spot welded high-strength steel sheets

Cited by 11 publications

References 12 publications

Validated Multi-Physical Finite Element Modelling of the Spot Welding Process of the Advanced High Strength Steel DP1200HD

Validated Multi-Physical Finite Element Modelling of the Spot Welding Process of the Advanced High Strength Steel DP1200HD

Application of a New Alloy and Post Processing Procedures for Laser Cladding Repairs on Hypereutectoid Rail Components

Numerical modeling from process to residual stress induced in resistance spot welding of DP980 steel

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