Hot-rolled steel sheet with excellent flash weldability for automotive wheel rim use.

Taka, Takao; Kunishige, Kazutoshi; Yamauchi, Nobuyuki; Nagao, Noriaki

doi:10.2355/isijinternational.29.503

Cited by 18 publications

(20 citation statements)

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“…Therefore, the incident power of a laser beam cannot be used directly in estimation of heat inputs or thermal cycle shapes, and an alternate procedure has been employed, which is discussed in Sec. 4.…”

Section: Laser Weldingmentioning

confidence: 99%

“…Mingsheng XIA, 1,2) Elliot BIRO, 3,4) Zhiling TIAN 2) and Y. Norman ZHOU 1) grades, with nominal ultimate tensile strengths of 450, 600 and 980 MPa. The chemical compositions, calculated data and mechanical properties of these steels are summarized in Table 1.…”

Section: Effects Of Heat Input and Martensite On Haz Softening In Lasmentioning

confidence: 99%

“…Transverse tensile tests on welded DP coupons also show that necking tends to initiate in this region, at stress levels that are lower than the base material strength. 4) Significant softening can also degrade the formability of welded blanks. 8) So far, no detailed or systematic study has been published to investigate the HAZ softening phenomenon of welded DP steels.…”

Section: Introductionmentioning

confidence: 99%

“…3) Previous work that studied the weldability of DP steels has concluded that in general the sub-critical area of the heat affected zone (HAZ) will soften during welding; this is typically referred to as HAZ softening. [4][5][6][7] This phenomenon is caused by tempering of the pre-existing martensite in the sub-critical areas of the HAZ. [4][5][6][7] HAZ softening can have a significant affect on weldment strength.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7] This phenomenon is caused by tempering of the pre-existing martensite in the sub-critical areas of the HAZ. [4][5][6][7] HAZ softening can have a significant affect on weldment strength. Transverse tensile tests on welded DP coupons also show that necking tends to initiate in this region, at stress levels that are lower than the base material strength.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels

Xia¹,

Biro²,

Tian³

et al. 2008

ISIJ Int.

209

109

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Laser welds were made in three dual-phase (DP) alloys with ultimate tensile strengths ranging from 450-980 MPa and varying microstructures to investigate effects of heat input on heat affected zone (HAZ) softening. To compare the total heat transferred into the HAZ of all the welds, heat input was normalized using the Rosenthal Equation. It was found that HAZ softening experienced in a DP steel was a function of both martensite content and heat input. Maximum HAZ softening was proportional to the martensite content, and the heat input controlled the completion of softening. Material softening was normalized by martensite content, which showed that the contribution of martensite to material hardness from the three materials is the same; however the materials had different transformation kinetics.

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Section: Laser Weldingmentioning

confidence: 99%

Section: Effects Of Heat Input and Martensite On Haz Softening In Lasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels

Xia¹,

Biro²,

Tian³

et al. 2008

ISIJ Int.

209

109

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Characterization and modelling techniques for gas metal arc welding of DP 600 sheet steels

Mukherjee

Prahl

Bleck

et al. 2010

Materialwissenschaft Werkst

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The objectives of the present work are to characterize the Gas Metal Arc Welding process of DP 600 sheet steel and to summarize the modelling techniques. The time-temperature evolution during the welding cycle was measured experimentally and modelled with the softwaretool SimWeld. To model the phase transformations during the welding cycle dilatometer tests were done to quantify the parameters for phase field modelling by MICRESSm. The important input parameters are interface mobility, nucleation density, etc. A contribution was made to include austenite to bainite transformation in MICRESSm. This is useful to predict the microstructure in the fast cooling segments. The phase transformation model is capable to predict the microstructure along the heating and cooling cycles of welding. Tensile tests have shown the evidence of failure at the heat affected zone, which has the ferrite-tempered martensite microstructure.Keywords: simulation / modelling / gas metal arc welding / microstructure / dual phase steel / Die Ziele der gegenwärtigen Arbeit sind, das Verfahren des Metallschutzgasschweißens von DP 600 Blech-Stahl zu charakterisieren und die entsprechenden Modellierungstechniken zusammenzufassen. Der Zeit-Temperaturverlauf während des Schweißzyklus wurde experimentell gemessen und anhand der Simulationssoftware SimWeld modelliert. Um die Phasenumwandlungen während des Schweißzyklus zu modellieren wurden Dilatometrie-Versuche, für die Quantifizierung der Parameter für die Phasenfeldmodellierung durch MICRESSm, durchgeführt. Die wichtigsten Eingangsparameter sind Grenzschichtmobilität, Keimbildungsdichte etc. Es wurde eine Methode entwickelt, mit der die Transformation von Austenit zu Bainit in MICRESSm überführt werden kann. Dies ist nützlich, um die Mikrostruktur in den schnell abkühlenden Bereichen vorauszusagen. Das Phasenumwandlungsmodell ist in der Lage, die Mikrostruktur entlang der Aufheizund Abkühlungszyklen des Schweißens abzuschätzen. Zugversuche haben gezeigt, dass das Versagen in der Wärmeeinflusszone, die aus einer ferritisch-gehärteten martensitischen Mikrostruktur besteht, stattfindet.

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Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds

Biro

McDermid

Embury

et al. 2010

Metall Mater Trans A

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Welds in dual-phase (DP) steels exhibit heat-affected zone (HAZ) softening in which the tempered or subcritical HAZ exhibits a lower hardness vs that of the parent material. The rate of this softening reaction with respect to welding heat input was determined for four DP steels by making several bead-on-plate laser welds using a variety of heat inputs and measuring the resulting minimum hardness. The reduction in hardness was then fit to the Avrami equation, enabling a comparison of the relative heat needed to soften each steel. It was found that the heat input required for HAZ softening decreased as the C content of the martensite within the DP structure increased. However, the presence of carbide forming alloying elements such as Cr and Mo was able to increase resistance to softening.

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Hot-rolled steel sheet with excellent flash weldability for automotive wheel rim use.

Abstract: of cars, high strength steels are tried to pvt into practice.As iar as wheel rim is concerned, flash weldability is very important as well as tormability of steels In this report, flash weldability of CC killed steel, HSLA (High Strength Low Alloy) and DP (Dual Phase)

Cited by 18 publications

References 0 publications

Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels

Effects of Heat Input and Martensite on HAZ Softening in Laser Welding of Dual Phase Steels

Characterization and modelling techniques for gas metal arc welding of DP 600 sheet steels

Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds

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