Mechanical Behavior of Twinning Induced Plasticity Steel Processed by Warm Forging and Annealing

Abstract:

The present study shows that warmly forged and low-temperature annealed twinning induced plasticity (TWIP) steel exhibited very high dislocation density and apparent yield-point phenomenon in addition to very high yield strength. The initial density of dislocations significantly affected the evolution of dislocations during the subsequent tensile deformation. Original high dense dislocations prompted the rapid increase of dislocations, and intensified the complexity of dislocation configurations. All these effects made the twinning deformation weakened but the dislocation deformation enhanced, leading to increased strength but decreased plasticity.

• Periodical: Defect and Diffusion Forum (Volume 385)
• Pages: 21-26
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.385.21
• Online since: July 2018
• Authors: Wen Wang, Dan Wang, Fu Sheng Han
• Keywords: Dislocation, Forging, Mechanical Properties, Twinning, TWIP Steel

References

[1] Grässel O, Krüger L, Frommeyer G, Meyer L W, High strength Fe-Mn-(Al, Si) TRIP/TWIP steels development - properties- application, Inter. J. Plasticity, 16 (2000) 1391-1409.

DOI: 10.1016/s0749-6419(00)00015-2

[2] Gutierrez-Urrutia I, Raabe D, Multistage strain hardening through dislocation substructure and twinning in a high strength and ductile weight-reduced Fe-Mn-Al-C steel, Acta Mater. 60 (2012) 5791-5802.

DOI: 10.1016/j.actamat.2012.07.018

[3] B. B. He, B. Hu, H. W. Yen, G. J. Cheng, Z. K. Wang, H. W. Luo, M. X. Hua, High dislocation density–induced large ductility in deformed and partitioned steels, Science 357 (2017) 1029-1032.

DOI: 10.1126/science.aan0177

[4] Suihe Jiang, Hui Wang, Yuan Wu, Xiongjun Liu, Honghong Chen, Mengji Yao, Baptiste Gault, Dirk Ponge, Dierk Raabe, Akihiko Hirata, Mingwei Chen, Yandong Wang, Zhaoping Lu, Ultrastrong steel via minimal lattice misfit and high-density nanoprecipitation, Nature. 544 (2017).

DOI: 10.1038/nature22032

[5] Raabe D, Roters F, Neugebauer J, Gutierrez-Urrutia I, Hickel T, Bleck W, Mayer J. A, initio-guided design of twinning-induced plasticity steels. MRS Bull. 41 (2016) 320-325.

DOI: 10.1557/mrs.2016.63

[6] Dini G, Ueji R, Najafizadeh A, Monir-Vaghefi S M, Flow stress analysis of TWIP steel via the XRD measurement of dislocation density, Mater. Sci. Eng A 527 (2010) 2759-2763.

DOI: 10.1016/j.msea.2010.01.033

[7] H. P. Karnthaler, The study of glide on {001} planes in f.c.c. metals deformed at room temperature, Phil. Mag. A 38 (1978) 141-156.

DOI: 10.1080/01418617808239225

[8] Lee J H, Holland T B, Mukherjee A K, Direct observation of Lomer-Cottrell Locks during strain hardening in nanocrystalline nickel by in situ TEM, Sci. Rep. 3:1061 (2013) 1-6.

DOI: 10.1038/srep01061

[9] Kumar N, Goel S, Jayaganthan R, Brokmeier Heinz-Günter, Effect of Grain boundary misorientaton, Deformation Temperature and AlFeMnSi-phase on Fatigue Life of 6082 Al alloy, Mater. Charact. 124 (2017) 229-240.

DOI: 10.1016/j.matchar.2017.01.002

[10] Pierce D T, Jiménez J A, Bentley J, Raabe D, Witting J E, The influence of stacking fault energy on the microstructural and strain-hardening evolution of Fe–Mn–Al–Si steels during tensile deformation, Acta Mater. 100 (2015) 178-190.

DOI: 10.1016/j.actamat.2015.08.030