The Effect of Alloying Elements on Microstructure of 0,2%C TRIP Steel

Abstract:

Three low alloyed transformation induced plasticity (TRIP) steels with 0.2%C were used in this work. The first one was based on the most common and popular 0.2%C - 1.5%Mn - 1.8%Si concept and was used as a reference material. The second steel was further micro-alloyed by 0.06% of Niobium. The third steel was designed with lower manganese content of 0.6% and additional alloying by 0.8% of Chromium. Thermo-mechanical processing with incorporated incremental deformation was applied to each steel. Various cooling rates and numbers of deformation steps were tested with regard to final microstructure and properties. After this optimization, microstructures with the potential to utilize TRIP effect were achieved for all steels. Very good mechanical properties were obtained with ductility typically in the interval of 30-40% and the tensile strengths in the range of 680-835 MPa.

• Periodical: Materials Science Forum (Volume 891)
• Pages: 209-213
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.891.209
• Online since: March 2017
• Authors: Ludmila Kučerová*, Hana Jirková, Bohuslav Mašek
• Keywords: Advanced High Strength Steels (AHSS), Incremental Deformation, Retained Austenite, TRIP Steel

References

[1] S. Oliver et al., Dual Phase versus TRIP Strip Steels: Microstructural Changes and a Consequence of Quasi-static and Dynamic Tensile Testing, Material Characterization 57 (2007) 390-400.

DOI: 10.1016/j.matchar.2006.07.004

[2] K. Hulka, The Role of Niobium in Cold Rolled TRIP Steel, Materials Science Forum 473-474 (2005) 91-102.

DOI: 10.4028/www.scientific.net/msf.473-474.91

[3] Y. Y. Lee et al., Development of a Robust TRIP800 Concept for GI/GA Automotive Applications, Materials Science Forum 654-656 (2010) 274-277.

DOI: 10.4028/www.scientific.net/msf.654-656.274

[4] L. Kučerová et al., Influence of Nb Micro-alloying on TRIP Steels Treated by Continuous Cooling Process, Manufacturing Technology 16 (2016) 145-149.

DOI: 10.21062/ujep/x.2016/a/1213-2489/mt/16/1/145

[5] H. Jirková et al., The Effect of Chromium on Microstructure Development During Q-P Process. Materials Today: Proceedings 2 (2015) 627-630.

[6] K. I. Sugimoto et al., The Effects of Cooling Rate on Retained Austenite Characteristics of a 0. 2C-1. 5Si-1. 5Mn-1. 0Cr-0. 05Nb TRIP-Aided Martensitic Steel, Materials Science Forum 783-786 (2014) 1015-1020.

DOI: 10.4028/www.scientific.net/msf.783-786.1015

[7] H. Jirková et al., Optimisation of the Q-P Process Parameters for Low Alloyed Steels with 0. 2% C, Archives of Metallurgy and Materials 59 (2014) 1205-1210.

DOI: 10.2478/amm-2014-0209

[8] E.V. Pereloma et al., Transformation Behavior in Thermomechanically Processed C-Mn-Si TRIP Steels with and without Nb, Materials Science and Engineering A 273-275 (1999) 448-452.

DOI: 10.1016/s0921-5093(99)00325-1