Spot weldability of <i>δ</i>-TRIP steel containing 0·4 wt-%C

Yi, Hong; Lee, K. Y.; Lim, Ji‐Ho; Bhadeshia, H. K. D. H.

doi:10.1179/136217110x12813393169778

Cited by 22 publications

(20 citation statements)

References 21 publications

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“…8,9 However, in the first generation AHSS, which includes regular TRIP steels, where fully martensitic fusion zones become unavoidable, the C content should be kept ,0?25 wt-%. 10 Therefore, in these steel grades, microalloying seems to be the easiest way to reach a product of R m xA 80 exceeding 16 000 MPa %, set out by the automotive industry, while maintaining an appropriate spot weldability.…”

Section: Introductionmentioning

confidence: 99%

Relationship between microstructure and mechanical properties in Nb–V microalloyed TRIP steel

Križan

Spiradek-Hahn

Pichler

2015

Materials Science and Technology

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Nb-V additions clearly affected the precipitation state, respective phase transformations and final microstructure, and in turn, resulting mechanical properties of an intercritically annealed transformation induced plasticity sheet steel. As the precipitation hardening played a limited role in the overall strengthening, the grain refinement was the prevailing strengthening mechanism associated with the addition of the Nb-V microalloying to a basic TRIP780 composition. In addition to this, the microstructural changes, resulting from the addition of microalloying, lowered the stability of retained austenite, which decreased the elongation of the steel. Nevertheless, using this microalloying concept, an exceptional product of R m xA 80 exceeding 16 000 MPa % could be achieved.

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Section: Introductionmentioning

confidence: 99%

Relationship between microstructure and mechanical properties in Nb–V microalloyed TRIP steel

Križan

Spiradek-Hahn

Pichler

2015

Materials Science and Technology

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“…Comparisons of the performance of the current alloys against commercial high strength low alloy steels 21 are made in Table 4, including data from previous work. 9 The ductility ratio of 3LA exceeds that of commercially available 780TRIP steel in spite of its higher carbon content. This supports the hypothesis that the presence of d-ferrite is advantageous in enhancing the spot weldability even when the carbon equivalent exceeds 0?24 wt-%.…”

Section: Alloys and Experimentsmentioning

confidence: 99%

“…It should be noted that the limited cross-tensile tests on spot welds, as reported in Ref. 9, were on cold rolled steel rather than in the d-TRIP condition. The purpose of the present work was therefore to undertake a more comprehensive assessment of spot welds made on d-TRIP alloys, including new variants with compositions different from previous studies.…”

Section: Introductionmentioning

confidence: 99%

“…Some shear tests on spot welded d-TRIP steel in its final heat treated condition 9 have indicated promise, but more detailed work to include cross-tensile tests is necessary in order to establish a parameter known as the 'ductility ratio', which is the ratio of the cross/shear strengths. The origin of this parameter is not clear, but a small value indicates a brittle weld.…”

Section: Introductionmentioning

confidence: 99%

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Spot weldability of TRIP assisted steels with high carbon and aluminium contents

Jung

Lee

et al. 2012

Science and Technology of Welding and Joining

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We examine here the spot welding characteristics of transformation induced plasticity assisted steels, which contain d-ferrite as a consequence of their aluminium concentrations of 3?5 or 5?6 wt-% and which also have high carbon contents of 0?3 or 0?4 wt-% when compared with conventional automotive steels. The resistance spot welds are tested in both shear and crosstensile tests in order to determine the so called ductility ratio, which is a parameter associated with the fitness of such welds for automotive applications. With an increase in the d-ferrite fraction from 0?19 to 0?5, the hardness variation across the weld and heat affected zone is decreased approximately from 400 to 150 HV. It seems that the presence of stable d-ferrite is helpful in reducing hardness variations and in achieving a significant ductility ratio of 0?39.

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“…The addition of 3-5 wt.% Al provides a reduction in density of 4.5-8% [8]. Moreover, δ-TRIP steel possesses good weldability because of stable δ-ferrite [9]. These excellent characteristics make it potentially attractive as a third-generation automotive steel.…”

Section: Introductionmentioning

confidence: 99%

The Significance of Optimizing Mn-Content in Tuning the Microstructure and Mechanical Properties of δ-TRIP Steels

Chen

et al. 2021

Metals

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The δ-TRIP steel has attracted a lot of attention for its potential application in automotive components, owing to the low density, good combination of strength, and ductility. As the difficulty in yield strength further increasement is caused by large fraction ferrite, the work hardening ability was enhanced by optimizing the manganese (Mn)-content in this study. Three δ-TRIP steels with different manganese (Mn)-content were designed to explore the significant effect of Mn content on the work hardening behavior in order to develop high strength steel suitable for the industrial continuous annealing process. The detailed effect of Mn on microstructure evolution and deformation behavior was studied by scanning electron microscope (SEM), interrupted tensile tests, X-ray diffraction (XRD), and in-situ electron backscattered diffraction (EBSD). The study suggested that 2 Mn steel has the lowest degree of bainitic transformation, as a result of fine grain size of prior austenite. The large TRIP effect and dislocation strengthening improve the work hardening rate, resulting in 2 Mn steel exhibiting comparable mechanical properties with the QP980 steels. The retained austenite in 1.5 Mn steel progressively transformed into martensite and sustained the strain to a high strain value of 0.40, showing a good strength-ductility balance.

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Spot weldability of δ-TRIP steel containing 0·4 wt-%C

Cited by 22 publications

References 21 publications

Relationship between microstructure and mechanical properties in Nb–V microalloyed TRIP steel

Relationship between microstructure and mechanical properties in Nb–V microalloyed TRIP steel

Spot weldability of TRIP assisted steels with high carbon and aluminium contents

The Significance of Optimizing Mn-Content in Tuning the Microstructure and Mechanical Properties of δ-TRIP Steels

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