Effects of Nitrogen on the Mechanical Properties of Cold Rolled TRIP-aided Steel Sheets

Baik, Seung‐Chul; Park, Sungho; Kwon, Oh-Heum; Kim, Dong Ik; Oh, Kyu Hwan

doi:10.2355/isijinternational.46.599

Cited by 18 publications

(5 citation statements)

References 22 publications

(26 reference statements)

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“…[35] The intrinsic mobility of the austenite/ferrite boundary is reduced with increasing nitrogen content, such that as the nitrogen content keeps increasing, precipitates form, further hindering the austenite-to-ferrite transformation. [35,36] In order to determine the role of nitrogen, additional experiments were performed in an argon atmosphere (Figure 2). The results demonstrate that the evolution of the bainitic volume fraction with time does not change when argon is used as the inert environment instead of nitrogen ( Figure 2).…”

Section: Discussionmentioning

confidence: 99%

Role of Austenitization and Pre-Deformation on the Kinetics of the Isothermal Bainitic Transformation

Lambers

Tschumak

Maier

et al. 2009

Metall Mater Trans A

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The role of time-temperature path on the isothermal austenite-to-bainite phase transformation of low alloy 51 CrV 4 steel was investigated and the corresponding microstructures were analyzed. The important finding is that an incomplete initial austenitization treatment leaves undissolved carbides in the matrix, such that lower carbon and chromium content in the matrix result, eventually accelerating the phase transformation. Furthermore, the residual carbides constitute additional nucleation sites for the bainite plates, speeding up the process even further. Also, both plastic pre-deformation of the supercooled austenite and application of external elastic stresses during the phase transformation lead to transformation plasticity by enhancing the stress fields, providing a driving force for the growth of bainite plates along a preferred orientation. Overall, the current results constitute the first step toward establishing a database for constructing a realistic microstructure-based model for simulating metal forming operations involving austenite-to-bainite phase transformation.

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Section: Discussionmentioning

confidence: 99%

Role of Austenitization and Pre-Deformation on the Kinetics of the Isothermal Bainitic Transformation

Lambers

Tschumak

Maier

et al. 2009

Metall Mater Trans A

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“…(i) in Nb- (16)(17)(18)(19)(20)(21)(22)(23)(24)(25) Given a colony nucleated at a c GB, the Pitsch-Petch OR (see 'Appendix') prevailed if the a phase of the pearlite colony was totally isolated from the c grain where the colony did not develop, while the Bagaryatsky OR (see 'Appendix') prevailed otherwise (Fig. 6).…”

Section: Matrix Phase Transformationsmentioning

confidence: 99%

Application of electron backscatter diffraction to the study of phase transformations

Gourgues-Lorenzon¹

2007

International Materials Reviews

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615 ref. biblioInternational audienceThe application of the electron backscatter diffraction technique to the investigation of phase transformations is reviewed. The wide variety of results obtained using this technique is illustrated and discussed, focusing on thermodynamics and kinetics of phase transformations, solidification, solid state phase transformations, environmentally assisted reactions and thin film deposition. Emphasis is also placed on two rapidly growing developments: coupling electron backscatter diffraction with advanced experimental techniques and with more and more complex modelling of phase transformations and of resulting material properties

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“…The mechanical properties of the low alloy TRIP-aided steels with a chemical composition of 0.2C-1.5Si-1.5Mn-0.04Al (mass%) have been investigated by Baik et al, 29) and they have reported that the TS and ductility of the TRIPaided steels were improved by the addition of 100 ppm of nitrogen. It was concluded that the improvements in both TS and ductility might be caused by the increase in the volume fraction of retained austenite.…”

Section: Effect Of Nitrogen Additionmentioning

confidence: 99%

Effects of Matrix Structure and Nitrogen Content on Fatigue Properties of Ultrahigh-Strength Low Alloy TRIP-Aided Steels

et al. 2021

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To develop ultrahigh-strength steels for automotive impact safety parts, the effects of the microstructure and nitrogen content on the fatigue properties of ultrahigh-strength low alloy transformation-induced plasticity (TRIP)-aided steels with martensite (TM), bainitic ferrite-martensite (TBM), and bainitic ferrite (TBF) matrices were investigated. Compared to TBF steels, both the TM and TBM steels achieved high tensile strength, of more than 980 MPa, and excellent fatigue properties. This results from the suppression of crack propagation due to the effective TRIP of the relatively stable interlath retained austenite and the increase in tensile and yield strengths attributed to the low isothermal transformation treatment. The fatigue strengths of the ultrahigh-strength low alloy TRIP-aided steels were slightly increased by the addition of 100 ppm of nitrogen. The increase in fatigue strength of TM, TBM, and TBF steels with 100 ppm of nitrogen was caused by the fine and uniform martensite and bainitic ferrite matrices and retained austenite, along with the increase in carbon concentration in the retained austenite due to the precipitation of AlN.

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Effects of Nitrogen on the Mechanical Properties of Cold Rolled TRIP-aided Steel Sheets

Cited by 18 publications

References 22 publications

Role of Austenitization and Pre-Deformation on the Kinetics of the Isothermal Bainitic Transformation

Role of Austenitization and Pre-Deformation on the Kinetics of the Isothermal Bainitic Transformation

Application of electron backscatter diffraction to the study of phase transformations

Effects of Matrix Structure and Nitrogen Content on Fatigue Properties of Ultrahigh-Strength Low Alloy TRIP-Aided Steels

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