Analysis of Orientation Relationships, Carbon Partitioning and Strengthening Mechanism of a Novel Ultrahigh Strength Steel

Abstract

The orientation relationships, carbon partitioning and strengthening mechanism of a novel ultrahigh strength steel were analyzed in depth during the complex process of heat treatment. The experimental results reveal that the (011)α//()γ, [100]α//[011]γ orientation relationships can be drawn between martensite and retained austenite. The position and angle of martensite and retained austenite are shown more clearly from the stereographic projections. Moreover, the calculated results show that the carbon content near the austenite interface is the highest in the shorter carbon allocation time. With the further increase of time, its carbon content gradually decreases. Furthermore, a model of the relationship between yield strength and strengthening mechanism was established. It was proved that the main strengthening components contributing to the yield strength include Orowan strengthening, grain-size strengthening and dislocation hardening. The main strengthening mechanism of steel in this experiment is dislocation strengthening.

Keywords

quenching and partitioning / orientation relationships / carbon partitioning / strengthening mechanism / laser additive manufacturing

References

[1] Saito K, Takai K. Hydrogen Desorption Behavior Trapped in Various Microstructures of High-strength Steels Using Thermal Desorption Analysis[J]. Metall Mater. Trans. A, Phys. Metall. Mater. Sci., 2020, 52A: 531-543.

[2] Liu S, Hu B, Li W, et al. Refined Heterogeneous Phase Unit Enhances Ductility in Quenched Ultra-high Strength Steels[J]. Scr. Mater., 2021, 194(5): 113636

[3] Matloc DK, Speer JG. Processing Opportunities for New Advanced High-strength Sheet Steels[J]. Mater. Manuf. Process, 2010, 25: 7-13.

[4] Speer JG, Araujo AL, Matlock DK, et al. Nb-microalloying in Next-generation Flat-rolled Steels: An Overview[J]. Mater. Sci. Forum, 2017, 879: 1834-1840.

[5] Wu X, Jiang F, Wang Z, et al. Mechanical Behavior and Microstructural Evolution of a Bainite-based Quenching-partitioning (BQ&P) Steel under High Strain Rates[J]. Mater. Sci. Eng. A, 2021, 818(8): 141414

[6] Lai JP, Zhang LP, Gong W, et al. Two-body Abrasion Resistance of High Carbon Steel Treated by Quenching- partitioning- tempering Process[J]. Wear, 2019, 440–441: 203096.

[7] Dai Z, Yang Z, Zhang C, et al. Incomplete Carbon Partitioning during Quenching and Partitioning of Fe−C−Mn−Si Steels: Modeling and Experimental Validations[J]. Acta Mater., 2020, 200: 597-607.

[8] Wang K, Gu K, Miao J, et al. Toughening Optimization on a Low Carbon Steel by a Novel Quenching- Partitioning- Cryogenic- Tempering Treatment[J]. Mater. Sci. Eng. A, 2018, 743(JAN.16): 259-264.

[9] Kaar S, Dkrizan D, Schneider R, et al. Impact of Si and Al on Microstructural Evolution and Mechanical Properties of Lean Medium Mn Quenching and Partitioning Steels[J]. Steel Res. Int., 2020, 91: 2000181.

[10] Liu H, Sun H, Liu B, et al. An Ultrahigh Strength Steel with Ultrafine-grained Microstructure Produced through Intercritical Deformation and Partitioning Process[J]. Mater Des., 2015, 83: 760-767.

[11] Naderi M, Abbasi M, Saeed-Akbari A. Enhanced Mechanical Properties of a Hot-Stamped Advanced High-Strength Steel via Tempering Treatment[J]. Metall. Mater. Trans. A, Phys. Metall. Mater. Sci., 2013, 44(4): 1852-1861.

[12] Wang M, Huang M. Abnormal TRIP Effect on the Work Hardening Behavior of a Quenching and Partitioning Steel at High Strain Rate[J]. Acta Mater., 2020, 188: 551-559.

[13] Wu J, Bao L, Gu Y, et al. The Strengthening and Toughening Mechanism of Dual Martensite in Quenching-partitioning Steels[J]. Mater. Sci. Eng. A., 2020, 772: 138765.

[14] Toji Y, Miyamoto G, Raabe D. Carbon Partitioning during Quenching and Partitioning Heat Treatment Accompanied by Carbide Precipitation[J]. Acta Mater., 2015, 86: 137-147.

[15] Chen K, Jiang Z, Liu F, et al. Enhanced Mechanical Properties by Retained Austenite in Medium-carbon Si-rich Microalloyed Steel Treated by Quenching-tempering, Austempering and Austempering-tempering Processes[J]. Mater. Sci. Eng. A, 2020, 790: 139742.

[16] Enomoto M, White CL, Aaronson HI. Evaluation of the Effects of Segregation on Austenite Grain Boundary Energy in Fe−C−X Alloys[J]. Metall. Mater. Trans. A, Phys. Metall. Mater. Sci., 1988, 19: 1807-1818.

[17] Zhang GH, Takeuchi T, Enomoto M, et al. Influence of Crystallography on Ferrite Nucleation at Austenite Grain-Boundary Faces, Edges, and Corners in a Co−15Fe Alloy[J]. Metall. Mater. Trans. A, Phys. Metall. Mater. Sci., 2011, 42: 1597-1608.

[18] Liu HP, Lu XW, Jin XJ, et al. Enhanced Mechanical Properties of a Hot Stamped Advanced High-strength Steel Treated by Quenching and Partitioning Process[J]. Scr. Mater., 2011, 64: 749-752.

[19] Liu HP, Jin XJ, Dong H, et al. Martensitic Microstructural Transformations from the Hot Stamping, Quenching and Partitioning Process[J]. Mater. Charact., 2011, 62: 223-227.

[20] Liu H, Liu B, Wang Y, et al. Analysis of Microstructure and Mechanical Properties of Ultrafine Grained Low Carbon Steel[J]. J. Wuhan Univ. of Tech.-Mater. Sci. Ed., 2016, 31(5): 1099-1104.

[21] Redjaïmia A, Morniroli JP, Donnadieu P, et al. Microstructural and Analyticalstudy of Heavily Faulted Frank-Kasper R-phase Precipitates in the Ferrite of a Duplex Stainless Steel[J]. J. Mater. Sci., 2002, 37: 4079-4091.

[22] Liu C, Zhao Q, Liu Y, et al. Microstructural Evolution of High Cr Ferrite/Martensite Steel after Deformation in Metastable Austenite Zone[J]. Fusion Eng. Des., 2017, 215: 367-371.

[23] Calcagnotto M, Adachi Y, Ponge D, et al. Deformation and Fracture Mechanisms in Fine-and Ultrafine-grained Ferrite/Martensite Dual-phase Steels and the Effect of Aging [J]. Acta Mater., 2011, 59: 658-670.

[24] Santofimia MJ, Zhao L, Sietsma J. Model for the Interaction between Interface Migration and Carbon Diffusion during Annealing of Martensite-Austenite Microstructures in Steels[J]. Scr. Mater., 2008, 59(2): 159-162.

[25] Knijf DD, Santofimia MJ, Shi H, et al. In situ Austenite-Martensite interface Mobility Study during Annealing[J]. Acta Mater., 2015, 90: 161-168.

[26] Santofimia MJ, Speer JG, Clarke AJ, et al. Influence of Interface Mobility on the Evolution of Austenite-Martensite Grain Assemblies during Annealing[J]. Acta Mater., 2009, 57(15): 4548-4557.

[27] Santofimia MJ, Zhao L, Sietsma J. Model for the Interaction between Interface Migration and Carbon Diffusion during Annealing of Martensite-Austenite Microstructures in Steels[J]. Scr. Mater., 2008, 59(2): 159-162.

[28] Arlazarov A, Ollat M, Masse JP, et al. Influence of Partitioning on Mechanical Behavior of Q&P Steels[J]. Mater. Sci. Eng. A, 2016, 661: 79-86.

[29] Ariza EA, Nishikawa AS, Goldenstein H, et al. Characterization and Methodology for Calculating the Mechanical Properties of a TRIP-steel Submitted to Hot Stamping and Quenching and Partitioning (Q&P)[J]. Mater. Sci. Eng. A, 2016, 671: 54-69.

[30] Maheswari N, Chowdhury SG, Kumar KCH, et al. Influence of Alloying Elements on the Microstructure Evolution and Mechanical Properties in Quenched and Partitioned Steels[J]. Mater. Sci. Eng. A, 2014, 600: 12-20.

[31] Tasan CC, Diehl M, Yan D, et al. Integrated Experimental-simulation Analysis of Stress and Strain Partitioning in Multiphase Alloys[J]. Acta Mater., 2014, 81: 386-400.

[32] Wang MM, Tasan CC, Ponge D, et al. Nanolaminate Transformation-induced Plasticity-twinning-induced Plasticity Steel with Dynamic Strain Partitioning and Enhanced Damage Resistance[J]. Acta Mater., 2015, 85: 216-228.

[33] Bahmanpour H, Youssef KM, Horky J, et al. Deformation Twins and Related Softening Behavior in Nanocrystalline Cu-30% Zn Alloy[J]. Acta Mater., 2012, 60(8): 3340-3349.

[34] Lu L, Chen X, Huang X, et al. Revealing the Maximum Strength in Nanotwinned Copper[J]. Science, 2009, 323(5914): 607-610.

[35] Zhang Z, Chen DL. Contribution of Orowan Strengthening Effect in Particulate-reinforced Metal Matrix Nanocomposites[J]. Mater. Sci. Eng. A, 2008, 483(483–484): 148-152.

[36] Hansen N. The Effect of Grain Size and Strain on the Tensile Flow Stress of Copper at Room Temperature[J]. Acta Mater., 1977, 25(8): 863-869.

[37] Zhang Z, Chen DL. Consideration of Orowan Strengthening Effect in Particulate-reinforced Mmetal Matrix Nanocomposites: A Model for Predicting Their Yield Strength[J]. Scr. Mater., 2006, 54(7): 1321-1326.

[38] Maropoulos S, Paul JDH, Ridley N. Microstructure-property Relationships in Tempered Low Alloy Cr−Mo−35Ni−V Steel[J]. Mater. Sci. Technol., 1993, 9(11): 1014-1020.

[39] Li HY, Lu XW, Li WJ, et al. Microstructure and Mechanical Properties of an Ultrahigh-Strength 40SiMnNiCr Steel during the One-Step Quenching and Partitioning Process[J]. Metall. Mater. Trans. A, Phys. Metall. Mater. Sci., 2010, 41(5): 1284-1300.

[40] Gladman T, Dulieu D, Mivor ID. Proc. Int. Conf. on High Strength Low Alloy Steels-Microalloying 75[C], 1977 New York: Union Carbide Corporation. 32-55.

[41] Sc A, Mksa B, Nnk B, et al. Simulation of Hall-Petch Effect in Alloy 690 Using Crystal Plasticity Model Considering Effect of Grain Boundaries[J]. Mater. Lett., 2021, 297: 129915.

[42] Andani MT, Lakshmanan A, Sundararaghavan V, et al. Quantitative Study of the Effect of Grain Boundary Parameters on the Slip System Level Hall-Petch Slope for Basal Slip System in Mg−4Al[J]. Acta Mater., 2020, 200: 148-161.