Stretch-Flange Formability of High-Strength Steel

Matsuzu, Nobuhiko; Itami, Atsushi; Koyama, Kazuo

doi:10.4271/910513

Cited by 6 publications

(8 citation statements)

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“…55) Although it is preferred to make microstructures duplex as combinations of soft and hard regions to improve ductility, it is effective for the improvement of hole expansivity to make microstructures as uniform as possible by choosing bainite or martensite microstructures. Since hole expansivity can be lowered by the existence of coarse cementite, 56) Ti was reported to be added more than the equivalent amount of C in atomic weight to avoid the formation of cementite improving hole expansivity of hot rolled 780 MPa grade steels. 57) It is important to control the coiling temperature at which TiC precipitation occurs.…”

Section: Development Of As Hot Rolled High Strength Steels With High mentioning

confidence: 99%

“…Si addition is reported to make cementite particles fine and, as a result, high hole expansivity can be obtained with mixed microstructures of ferrite and bainite. 56) It is essential to point out the importance to make inclusions harmless. It has been well understood the relation between S content in steels and hole expansivity.…”

Section: Development Of As Hot Rolled High Strength Steels With High mentioning

confidence: 99%

“…63) Since sulfide particles such as MnS can be initiation sites of cracks and deteriorate hole expansivity, lowering of S content is known to improve hole expansivity. 56) It is also important to reduce segregations and impurities to improve hole expansivity as well as to make inclusions harmless.…”

Section: Development Of As Hot Rolled High Strength Steels With High mentioning

confidence: 99%

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Sheet Steel Technology for the Last 100 Years: Progress in Sheet Steels in Hand with the Automotive Industry

Takahashi

2015

ISIJ Int.

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Development in sheet steels has progressed in strong relation with automotive industry in Japan. To meet the requirements from automotive industry, various types of sheet steels including high and ultrahigh strength steel sheets have been developed. Progresses in three types of steel series will be discussed by checking the historical facts and technologies and their contributions. Introductions of interstitial free (IF) steel and continuous annealing system are the important events in mild steel developments for panels. Extensive work on finding the optimum mixtures of hard and soft phases to improve elongation of steels contributed to improve the crashworthiness of autobodies. Continuous annealing system also played an important role in producing these advanced high strength steels. Precipitation is used in a particular way which is to scavenge solute carbon and nitrogen and to prevent coarse cementite particle precipitation. It is also worth to point out that the collaborative activities particularly strong in Japan between steel manufacturers and auto companies have affected the progress in advanced sheet steels.

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Section: Development Of As Hot Rolled High Strength Steels With High mentioning

confidence: 99%

Section: Development Of As Hot Rolled High Strength Steels With High mentioning

confidence: 99%

Section: Development Of As Hot Rolled High Strength Steels With High mentioning

confidence: 99%

See 1 more Smart Citation

Sheet Steel Technology for the Last 100 Years: Progress in Sheet Steels in Hand with the Automotive Industry

Takahashi

2015

ISIJ Int.

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“…15,17,18) In addition to them, the importance of microstructure 19,20) and grain size 21) have been also pointed out. Though these results were obtained by the conventional production route, the metallurgical background on stretch flangeability must be common in both of the TSC-HDR and CCR routes.…”

Section: Stretch Flangeabilitymentioning

confidence: 99%

“…The reason why high carbon containing steel, G, shows lower value than other Nb bearing low carbon steels in the same tensile strength level is thought to be come from the difference of the volume fraction of second phase as pointed out by many researchers. 15,[17][18][19] Steels B and E which contain high Mn and Nb exhibited high TS and l balance despite of the lower TS and El compared with other Nb bearing steels. As shown in Fig.…”

Section: Stretch Flangeabilitymentioning

confidence: 99%

Effect of Nb on Hot Rolled High Strength Steel Sheets Produced by Thin Slab Casting and Hot Direct Rolling Process

Hashimoto¹

2003

ISIJ International

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Effect of Intercritical Annealing on Microstructure and Tensile Properties of an Ultrafine‐Grained Dual‐Phase Low Alloy Steel Containing Titanium

Bakhtiari

Kermanpur

Han

et al. 2020

steel research int.

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Ultrafine‐grained (UFG) dual‐phase (DP) AISI 5115 steel containing 0.12 wt% Ti is developed using thermomechanical treatment of cold rolling and intercritical annealing. The aim is to investigate the effect of intercritical annealing time on microstructural changes, mechanical properties, and fracture behavior. The results show that, with increasing intercritical annealing time up to 8 min, the martensite island size and the martensite volume fraction increase, whereas the ferrite grain size is not changed. Significant TiC precipitation is found inside the ferrite grains that retards grain growth during annealing. The yield strength (YS) and ultimate tensile strength (UTS) of the UFG DP steels are enhanced by increasing the martensite volume fraction, while slightly attenuated by enlarging the size of martensite islands. A suitable combination of strength and ductility is obtained in terms of the amount of energy absorbed for UFG DP steels (UTS × UE > 160 MPa%) compared with the coarse‐grained DP steel (≈100 MPa%). The fracture mechanism of the UFG DP steel is ductile in which increasing annealing time results in a smaller average diameter of the dimples.

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Stretch-Flange Formability of High-Strength Steel

Cited by 6 publications

References 0 publications

Sheet Steel Technology for the Last 100 Years: Progress in Sheet Steels in Hand with the Automotive Industry

Sheet Steel Technology for the Last 100 Years: Progress in Sheet Steels in Hand with the Automotive Industry

Effect of Nb on Hot Rolled High Strength Steel Sheets Produced by Thin Slab Casting and Hot Direct Rolling Process

Effect of Intercritical Annealing on Microstructure and Tensile Properties of an Ultrafine‐Grained Dual‐Phase Low Alloy Steel Containing Titanium

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