Tempering of Mn and Mn-Si-V Dual-Phase Steels

Speich, G. R.; Schwoeble, A. J.; Huffman, G.P.

doi:10.1007/bf02659856

Cited by 19 publications

(14 citation statements)

References 9 publications

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“…During tempering, some carbon atoms migrate to dislocations, effectively pinning them and causing the increase in yield strength and the reappearance of a defined yield point. This was also seen by Speich et al [ 46] on the tempering of Mn and Mn-Si-V dual-phase steels. Tempering also relieved the stress in the martensite caused by the lattice shear.…”

Section: Effect Of Temperingsupporting

confidence: 77%

The mechanical properties of drawn dual phase steel wire

Miyasato¹

1987

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Dual-phase steels are a class of composite high strength, low alloy steels. The outstanding properties of ferrite/martensite dual-phase steels include its very high workhardening rates and resistance to fatigue failure. The high work-hardening rates make dualphase steels ideal for large strain cold forming applications, since high strengths may be achieved with less deformation. Dual-phase steels have been shown to be especially suited ~~ wire drawing. In this study, Fe/xC/2Si alloys were heat treated to obtain different ferrite/martensite morphologies and relative volume fractions, then the work-hardening rates at true plastic strain £=0.006 were determined. Wires were then drawn from 4.2 to 1.4 mm in diameter, which corresponded to a strain of £=2.2, and tested in tension and fatigue. The early work-hardening rate increased with increased volume fraction of martensite, increased strength of martensite, and decreased ferrite/martensite interface coherency. The wire drawing limit was raised by discouraging void formation at ferrite/martensite interfaces and shear cracking through martensite particles. The lowest void density was obtained in a structure of fibrous martensite with coherent ferrite/martensite interfaces (i.e. produced by intermediate quenching). The fatigue limit of drawn dual-phase wires was -600 MPa, or 25-30% of the ultimate tensile strength, which appears to be higher than that of similar pearlitic steel wire. There was no superior microstructure for fatigue resistance in wires, as any morphology differences which exist in the initial structure are indistinguishable after heavy deformation. Fatigue cracks initiated on the wire surface at inclusions, sites of interface decohesion and martensite particle cracking, and in the interior of the wire at large cracks which formed during wire drawing. Attempts at monitoring small crack growth by replication were unsuccessful.

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Section: Effect Of Temperingsupporting

confidence: 77%

The mechanical properties of drawn dual phase steel wire

Miyasato¹

1987

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“…In some cases, the DP steels produced thus may subsequently be subjected to overaging, galvanising or galvannealing treatments, depending on the final application. These treatments essentially amount to tempering of the DP microstructure albeit for very short durations, typically 60-360 s. 1 Though some prior research has been conducted to understand the effect of tempering on the mechanical properties of DP steels, [2][3][4][5][6][7][8][9][10][11] in most of these studies, tempering was carried out for 30-60 min. [2][3][4][5] Moreover, the changes in mechanical properties, especially yield strength and ductility reported in these studies, are inconsistent with each other.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5] Moreover, the changes in mechanical properties, especially yield strength and ductility reported in these studies, are inconsistent with each other. While some researchers [4][5][6]8 have reported a decrease in yield strength on tempering and have justified it to be a result commensurate with the tempering characteristics of martensite, others 2,3,7,[9][10][11] have reported an increase in yield strength, attributing it to factors like return of discontinuous yielding, reduction in residual stresses in ferrite and formation of microalloy carbides in ferrite. With respect to ductility, while most of the existing literature report an increase in ductility on tempering, some studies also report a loss of ductility, 9,11 attributing it to the decomposition of retained austenite to bainite.…”

Section: Introductionmentioning

confidence: 99%

Effect of short duration tempering on the microstructure and mechanical properties of a continuously annealed dual phase steel

Mukherjee

Chintha

Raj

et al. 2012

Materials Science and Technology

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The effect of short duration tempering on the microstructure and mechanical properties of a continuously annealed dual phase steel was investigated using techniques like electron microscopy, dilatometry and thermodynamic calculations. It was found that a complex interplay of phenomena like tempering of martensite, quench aging of ferrite and recovery of the overall structure was responsible for the change in mechanical properties recorded.

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“…Another method for processing of DP steels (say, Route B) involves, first slow cooling from fully austenitic region up to the desired ferrite transformation temperature, followed by quenching to room temperature for transforming the remaining austenite to martensite. 26,[83][84][85][86][87] The properties obtained by this route (Route B) include lesser tensile strength and higher ductility than the first method (Route A). This is attributed to the large austenite grain size obtained by Route B than Route A.…”

Section: Processing Of Dp Steelsmentioning

confidence: 99%

Third generation of advanced high-strength steels: Processing routes and properties

Nanda

Singh

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part L:

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The automobile industry is presently focusing on processing of advanced steels with superior strength-ductility combination and lesser weight as compared to conventional high-strength steels. Advanced high-strength steels are a new class of materials to meet the need of high specific strength while maintaining the high formability required for processing, and that too at reasonably low cost. First and second generation of advanced high-strength steels suffered from some limitations. First generation had high strength but low formability while second generation possessed both strength and ductility but was not cost effective. Amongst the different types of advanced high-strength steels grades, dual-phase steels, transformation-induced plasticity steels, and complex phase steels are considered as very good options for being extended into third generation advanced high-strength steels. The present review presents the various processing routes for these grades developed and discussed by different authors. A novel processing route known as quenching and partitioning route is also discussed. The review also discusses the resulting microstructures and mechanical properties achieved under various processing conditions. Finally, the key findings with regards to further research required for the processing of advanced high-strength steels of third generation have been discussed.

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Tempering of Mn and Mn-Si-V Dual-Phase Steels

Cited by 19 publications

References 9 publications

The mechanical properties of drawn dual phase steel wire

The mechanical properties of drawn dual phase steel wire

Effect of short duration tempering on the microstructure and mechanical properties of a continuously annealed dual phase steel

Third generation of advanced high-strength steels: Processing routes and properties

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