Investigating the microstructure, mechanical properties and hole expansion of advanced high strength steel with the approach of application in the car body

Document Type : Original Article

Authors

1 MSc Student, Department of Metallurgical Engineering, Tarbiat Modares University, Tehran, Iran

2 Professor, Department of Metallurgical Engineering, Tarbiat Modares University, Tehran, Iran

10.22034/ijme.2023.392262.1770

Abstract

In recent years, with the increase in competition between automobile companies and the establishment of government laws to further reduce fuel consumption and, as a result, the requirement to reduce vehicle weight, the third generation of advanced strength steels have received much attention in the automotive industry due to their better tensile strength and ductility than the first generation and lower cost than the second generation. In this research, a new candidate of the third generation of advanced high-strength steels, with the name of 112HR, was design, production, and introduced and its mechanical properties were investigated and compared with SAPH440 steel, which is currently used in the domestic car industry and in the car cabin. Uniaxial tensile test was performed in three directions of rolling, perpendicular to rolling and 45-degree angle to rolling. 112HR steel with a tensile strength of 1190 MPa and an increase in length of 54.5% and a ductility index of more than 60 GPa% has shown better properties than SAPH440 steel with a tensile strength of 450 MPa and elongation of 43%. But in the tensile test of grooved sample and hole expansion, which is a three-dimensional stress, 112HR steel performed worse, so that the cavity expansion rate of SAPH440 steel was about 3.76 times higher than that of 112HR steel. The reason for this difference is the transformation properties of austenite to martensite during deformation in 112HR steel and the low shear strength of martensite. The transformation of austenite to martensite was confirmed by X-ray diffraction and optical and electron microscopic investigations in 112HR steel.

Keywords

References

[1] Askari-Paykani M, Shahverdi HR, Miresmaeili R. Microstructural evolution and mechanical properties of a novel FeCrNiBSi advanced high-strength steel: Slow, accelerated and fast casting cooling rates. Materials Science and Engineering A. 2016;668:188–20. doi: 10.1016/j.msea.2016.05.002
[2] Stodolsky F, Vyas A, Cuenca R. Lightweight materials in the light-duty passenger vehicle market: Their market penetration potential and impacts:1995.
[3] Demeri MY. Advanced high-strength steels: science, technology, and applications. ASM international; 2013. 17–56 p.
[4] Askari-Paykani M, Shahverdi HR, Miresmaeili R. First and third generations of advanced high-strength steels in a FeCrNiBSi system. Journal of Materials Processing Technology. 2016; 238: 383–94. doi: 10.1016/j.jmatprotec.2016.07.043
[5] Aydin H, Essadiqi E, Jung IH, Yue S. Development of 3rd generation AHSS with medium Mn content alloying compositions. Materials Science and Engineering A. 2013; 564: 501–8. doi: 10.1016/j.msea.2012.11.113
[6]   Calcagnotto M, Adachi Y, Ponge D, Raabe D. Deformation and fracture mechanisms in fine-and ultrafine-grained ferrite/martensite dual-phase steels and the effect of aging. Acta Materialia. 2011; 59(2): 658–70. doi: 10.1016/j.actamat.2010.10.002
[7]   Emami M, Askari-paykani M, Farabi E. Development of New Third-Generation Medium Manganese Advanced High-Strength Steels Elaborating Hot-Rolling and Intercritical Annealing. Metallurgical and Materials Transactions A. 2019; 50(9): 4261–74. doi: 10.1007/s11661-019-05352-4
[8]   Lee YK, Han J. Current opinion in medium manganese steel. Materials Science and Technology. 2015 May 1; 31(7): 843-56. doi: 10.1179/1743284714Y.0000000722
[9]   Sedaghat-Nejad R, Shahverdi HR, Askari-Paykani M. Introduction and mechanical evaluation of a novel 3rd-generation medium manganese AHSS with 86 GPa% of PSE. Materials Science and Engineering: A. 2022 May 23;843:143104. doi: 10.1016/j.msea.2022.143104
[10] Lee S, De Cooman BC. On the selection of the optimal intercritical annealing temperature for medium Mn TRIP steel. Metallurgical and Materials Transactions A. 2013 Nov; 44: 5018-24. doi: 10.1007/s11661-013-1860-2
[11] AF P, PR R. Decomposition of austenite in austenitic stainless steels. ISIJ international. 2002 Apr 15; 42(4): 325-7. doi: 10.2355/isijinternational.42.325
[12] Karjalainen LP, Taulavuori T, Sellman M, Kyröläinen A. Some strengthening methods for austenitic stainless steels. Steel research international. 2008; 79(6): 404–12. doi: 10.1002/srin.200806146
[13] Sohrabi MJ, Mirzadeh H, Dehghanian C. Significance of martensite reversion and austenite stability to the mechanical properties and transformation-induced plasticity effect of austenitic stainless steels. Journal of Materials Engineering and Performance. 2020; 29: 3233–42. doi: 10.1007/s11665-020-04798-7
[14] Surkialiabad R, Mazinani M, Sabzevar MH, Tabasi HG, Kelidari Y. Magnetic investigation of strain induced martensite evolution. Inthe first international joint conference of Iranian metallurgical engineering society and Iranian foundrymen's society: 2012 Nov 6.
[15] Karelova A, Krempaszky C, Werner E, Tsipouridis P, Hebesberger T, Pichler A. Hole Expansion of dual‐phase and complex‐phase AHS Steels‐Effect of edge conditions. Steel research international. 2009 Jan;80(1):71-7. doi: 10.2374/SRI08SP110
[16] M. A. Paykani and H. R. Shahverdi, “High strength alloy steels and methods of making the same.” Google Patents: 2022.
[17] Emami M, Askari-paykani M, Farabi E. Development of New Third-Generation Medium Manganese Advanced High-Strength Steels Elaborating Hot-Rolling and Intercritical Annealing. Metallurgical and Materials Transactions A. 2019;50(9):4261–74. doi: 10.1007/s11661-019-05352-4
[18] Zabihi-Gargari M, Shahverdi HR, Emami M, Askari-Paykani M. Enhancing mechanical properties of medium Mn advanced high-strength steel by inter-critical annealing: elimination of austenizing and quenching steps. Ironmaking & Steelmaking. 2020 Nov 25;47(10):1148-60. doi: 10.1080/03019233.2019.1677038
[19] Shahverdi HR, Dehghani A, Zabihi-Gargari M, Emami M. Effect of intercritical annealing temperature and time on the microstructure and mechanical properties of medium Mn advanced high strength steel. Iranian Journal of Manufacturing Engineering. 2022;8(11):16-34. [In Persian]
[20] Amini-Chelak MH, Miresmaeili R, Askari-Paykani M, Aliyari H, Shahverdi HR. Resistance spot weldability of Fe66Cr16.5Ni14.1Si3.4 advanced high strength steel using D-optimal design of experiment method. Journal of Materials Research and Technology. 2023 Jul 1;25:5615-32. doi: 10.1016/j.jmrt.2023.06.262
[21] Kumar K, Pooleery A, Madhusoodanan K, Singh RN, Chakravartty JK, Dutta BK, Sinha RK. Use of miniature tensile specimen for measurement of mechanical properties. Procedia engineering. 2014 Jan 1;86:899-909. doi: 10.1016/j.proeng.2014.11.112
[22] ISO 12004 Standard. Metallic materials—sheet and strip—determination of forming limit curves—part 2: determination of forming limit curves in the laboratory. International Organization for Standardization. 2008, 12002-12004.
[23] American Society for Testing and Materials. ASTM E-92: standard test methods for vickers hardness and knoop hardness of metallic materials. West Conshohocken: ASTM.
[24] Allain S, Chateau JP, Bouaziz O, Migot S, Guelton N. Correlations between the calculated stacking fault energy and the plasticity mechanisms in Fe–Mn–C alloys. Materials Science and Engineering: A. 2004 Dec 15;387:158-62. doi: 10.1016/j.msea.2004.01.059
[25] Moallemi M, Zarei-Hanzaki A, Mirzaei A. On the stacking fault energy evaluation and deformation mechanism of Sanicro-28 super-austenitic stainless steel. Journal of Materials Engineering and Performance. 2015 Jun;24:2335-40. doi: 10.1007/s11665-015-1501-6
[26] Figueiredo RB, Sicupira FL, Malheiros LR, Kawasaki M, Santos DB, Langdon TG. Formation of epsilon martensite by high-pressure torsion in a TRIP steel. Materials Science and Engineering: A. 2015 Feb 11;625:114-8. doi: 10.1016/j.msea.2014.11.091
[27] Ma Y, Levitas VI, Hashemi J. X-ray diffraction measurements in a rotational diamond anvil cell. Journal of Physics and Chemistry of Solids. 2006 Sep 1;67(9-10):2083-90. doi: 10.1016/j.jpcs.2006.05.052
[28] Hutchinson B, Lindell D, Barnett M. Yielding behaviour of martensite in steel. ISIJ international. 2015 May 15;55(5):1114-22. doi: 10.2355/isijinternational.55.1114

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