Analysis of microstructure and mechanical properties of ultrafine grained low carbon steel

Li, Heping; Sun, Fei; Sun, Huer; Liu, Bin; Wang, Yi; Jin, Xianglin

doi:10.1007/s11595-016-1496-3

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…Current research generally agrees that micron-sized precipitates in steel can lead to compromised benefits of alloying and even cause degradation of mechanical properties [29,33,34]. However, diffusely distributed nanoscale nitrides or carbonitrides can effectively pin down grain boundaries, hindering grain growth and significantly improving the strength and toughness of the material [33,35,36]. Therefore, the addition of Nb and V elements can significantly inhibit the growth of grains through the In order to explore the essential reasons for the difference in the grain sizes of 22MnB5NbV and 22MnB5 steel, the precipitates at the grain boundaries and within the grains have been detected and analyzed by scanning electron microscopy, the result is shown in Figure 18.…”

Section: Effects Of Nb and V Alloying On The Strength And Plasticity ...mentioning

confidence: 99%

Evolution of Microstructures and Mechanical Properties of Nb-V Alloyed Ultra-High Strength Hot Stamping Steel in Austenitizing Process

Liu

Long

et al. 2022

Materials

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Clarifying the influence of Nb and V microalloying on the ultra-high strength hot stamping steel (UHSHSS) and exploring appropriate process parameters are the basis for effectively regulating properties of the final product. In this study, the effects of different austenitizing temperatures and holding times on the phase transitions, grain sizes and mechanical properties of 22MnB5NbV with Nb and V alloyed are studied by using JMatPro thermodynamic calculations and experiments. By comparing with 22MnB5 without Nb and V alloyed, the effects of Nb and V elements on quenching microstructures, grain sizes and mechanical properties of UHSHSS are analyzed. The suitable austenitizing process parameters of 22MnB5NbV have been obtained. The results show that the grain size of Nb-V-alloyed UHSHSS grows with the increase in the austenitizing temperature and holding time. The 22MnB5NbV steel can be completely austenitized while the austenitizing temperatures ≥870 °C and holding time ≥3 min. Combined with the actual production process, the best austenitizing temperature and holding time are 930 °C and 3 min. Under these conditions, the average grain size is 7.7 μm, the tensile strength, elongation and strength-ductility product are 1570.8 MPa, 6.6% and 10.4 GPa·%, respectively. With the addition of Nb and V elements, the nanoscale precipitates lead to the refinement of the quenched structure and grain size, and the comprehensive properties of UHSHSS have been effectively promoted, in which the elongation and strong-plastic products are increased by ~0.6% and ~1.2 GPa·%, respectively.

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Section: Effects Of Nb and V Alloying On The Strength And Plasticity ...mentioning

confidence: 99%

Evolution of Microstructures and Mechanical Properties of Nb-V Alloyed Ultra-High Strength Hot Stamping Steel in Austenitizing Process

Liu

Long

et al. 2022

Materials

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“…Huo et al [9] pointed out that the refinement of primary austenite included two parts: (1) the dynamic recrystallization (DRX) process that occurred sufficiently during the first two rolling passes; (2) the increase in nucleation sites for phase transformation owing to the accumulation of deformation as the temperature decreases and deformation conditions varied during the following passes. Liu and Wang [10] studied low-carbon steels produced using the CSP process. The precipitates found within the nanoscale acted as alloying elements and improved the properties; however, these precipitates are inclusions on the microscale in conventional processes.…”

Section: Introductionmentioning

confidence: 99%

Refinement mechanism and optimization for compact strip production process

Cheng

Wei

et al. 2023

Materials Science and Technology

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To avoid the fracture of cold-rolled sheets, this study investigated the refinement mechanism for the compact strip production process and proposed an optimised method. The primary austenite grain size was 50–475 µm, and the grain size of the hot-rolled strips was 3.6–4.8 µm. The Gleeble-3500 simulator was applied to simulate the hot rolling process. Grain refinement was realised through dynamic recrystallization and the supply of more nucleation sites for transformation by sub-structures. Increasing the coiling temperature from 620 to 730 °C increased the ferrite fraction from 3.95 to 24.16%. The adjacent cementite distance changed from 0.33 to 0.84 µm, resulting in decreased yield and tensile strengths and increased elongation. Thus, the fracture of cold-rolled sheets was avoided.

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“…This technology can realize the rapid forming of complex structural parts, greatly reduce the processing procedures, shorten the processing cycle, and reduce the development costs and risks. At present, it has been widely used in biomedical parts, radiator parts, ultra-light structural parts, and micro-devices, as well as other fields [1][2][3][4][5]. In recent years, the strength and hardness of ordinary pure 316L stainless steel (316Lss) have been unable to meet some of the requirements of national defence and the nuclear power industries, such as those for parts that bear a heavy load and have high wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of TiC-Reinforced 316L Stainless Steel Composites Fabricated Using Selective Laser Melting

Zhao

Bai

et al. 2019

Metals

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TiC/316L stainless steel (316Lss) metal matrix composite parts have been formed using selective laser melting (SLM). In this study, we have investigated the influence of the TiC mass fraction on the microstructure evolution, microhardness, friction properties, wear properties, and corrosion resistance of the TiC/316Lss composites. The results show that the microhardness increased by the addition of the TiC mass fraction. In terms of friction and wear properties, the corrosion resistance initially increased, and then decreased. Compared with the pure 316Lss (298.3 HV0.2), the microhardness of the TiC/316Lss composites, which were formed with 2 wt% TiC, was raised to 335.2 HV0.2, which was a 12.4% increase, while the average friction coefficient was 0.123. The reason for this is that the addition of TiC can effectively refine the cell size, and as the TiC content increases, the refinement effect is more obvious. During the melting process, TiC particles act as nucleation centres, hindering the growth of crystal cells, promoting the formation of the austenite phase, and forming fine equiaxed structures, which increases the strength. However, excessive TiC particles aggravate the spheroidisation during the process of SLM, leading to increased defects, as well as a decrease in density and corrosion resistance.

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Analysis of microstructure and mechanical properties of ultrafine grained low carbon steel

Cited by 9 publications

References 29 publications

Evolution of Microstructures and Mechanical Properties of Nb-V Alloyed Ultra-High Strength Hot Stamping Steel in Austenitizing Process

Evolution of Microstructures and Mechanical Properties of Nb-V Alloyed Ultra-High Strength Hot Stamping Steel in Austenitizing Process

Refinement mechanism and optimization for compact strip production process

Microstructure and Mechanical Properties of TiC-Reinforced 316L Stainless Steel Composites Fabricated Using Selective Laser Melting

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