The stability of retained austenite at different locations during straining of I&amp;Q&amp;P steel

Song, Chenghao; Yu, Hao; Li, Lili; Zhou, Tao; Lü, Jun; Liu, Xihui

doi:10.1016/j.msea.2016.06.044

Cited by 60 publications

(17 citation statements)

References 32 publications

(35 reference statements)

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“…However, the enrichment of the elements 3 Scanning austenite also decreased gradually. In this process, the martensite transformed from austenite after quenching retains the distribution characteristics of Mn elements in austenite, i.e., the Mn content in the central region is higher than that in the surrounding area [13]. The C element partition after quenching between M s and M f can stabilize the retention of more retained austenite to room temperature [14].…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Effect of Different Isothermal Time on Microstructure and Mechanical Property of the Low-Carbon Steel Treated by Dual-Stable C-Mn Partitioning Process

Jing

Ding

et al. 2020

Scanning

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The stability of retained austenite was improved by the dual-stable C-Mn partitioning process. The phase transformation and element diffusion of dual-stable C-Mn partitioning process of tested steel were investigated by means of EPMA, SEM, OM, tensile testing machine, and other analysis methods. The effects of the first and second austenite stabilization time on the microstructure and mechanical properties of low-C-Si-Mn steel were studied, respectively. The enrichment of C and Mn elements is obvious after the dual-stable C-Mn partitioning process, and the microstructure of the tested steel is constituted of martensite, ferrite, and retained austenite. Compared with the conventional Q&P steel, the tensile strength of the steel treated by the dual-stable C-Mn partitioning process is slightly lower, but the plasticity is improved significantly. The tensile strength is 875-910 MPa, the elongation is 20-24%, and the product of strength and elongation can reach 21 GPa·%.

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Section: Experimental Materials and Methodsmentioning

confidence: 99%

Effect of Different Isothermal Time on Microstructure and Mechanical Property of the Low-Carbon Steel Treated by Dual-Stable C-Mn Partitioning Process

Jing

Ding

et al. 2020

Scanning

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“…In this research, the surrounding phase of retained austenite was only martensite due to the quenching and partitioning process. According to Song et al [33], the retained austenite between martensite laths remained stable, while retained austenite within ferrite grains transformed preferentially during straining. Thus, the small transformation degree of retained austenite may be due to the protective effect of the surrounding martensite laths.…”

Section: Deformation Microstructure Of the Dp Steelmentioning

confidence: 99%

“…The film-like RA could be found between martensite laths (see Figure 9a). During deformation, the film-like RA can transform into twin martensite during deformation [33]. Nevertheless, twin martensite could not be seen at a 74 • bending angle, as the lath martensite, having high strength, was not subjected to severe plastic deformation at this angle.…”

Section: Deformation Microstructure Of the Dp Steelmentioning

confidence: 99%

The Impact of Strain Heterogeneity and Transformation of Metastable Austenite on Springback Behavior in Quenching and Partitioning Steel

Liu

et al. 2018

Metals

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Multiple strengthening methods, such as high dislocation density, high twin density, small grain size, and metastable austenite phase can give high strength to ultra-high strength steels (UHSSs). However, the high strength of UHSSs often results in a greater tendency for springback when applied in manufacturing vehicle components. In the present study, two types of UHSSs, dual-phase (DP) steel and quenching and partitioning (QP) steel are investigated to study the springback behavior during the bending process. Results indicated that both the strain heterogeneity and the transformation of retained austenite impacted the springback behavior. The springback angle of the DP steel increased with the increase in bending angle, which was caused by the increasing degree of strain heterogeneity. However, the springback angle of the QP steel decreased to a 14.75 • when QP specimens were strained at a 104 • bending angle due to the inhibiting effect of the phase transformation. This indicated that there was preferential phase transformation in the thickness direction in the retained austenite of the outer and inner zones. The phase transformation caused low strain heterogeneity, which resulted in a lower tendency for springback. The results suggested that QP steel could possess lower springback at a proper bending angle.

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“…The influence factors in previous researches are summarized as follows: the stability of retained austenite improves with the increase of C content, while decreasing with the grain size due to the low martensitic transformation temperature; the stability of thin film-like retained austenite is higher than that of block and other shapes. In addition, the retained austenite stability is also related to texture [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Quasi-Situ Characterization of Retained Austenite Orientation in Quenching and Partitioning Steel via Uniaxial Tensile Tests

et al. 2020

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As a representative of the third generation of advanced high strength steel, the quenching and partitioning steel has excellent potential in automobile manufacturing. The characterization and analysis of the mechanical properties and microstructure of the quenching and partitioning steel during deformation is an effective way to explore the microstructure evolution and transformation-induced plasticity effects of complex phase steels. The relationship between the microstructure morphology and mechanical properties of a 1180 MPa-grade quenching and partitioning steel was investigated through interrupted uniaxial tensile tests plus quasi-situ electron backscatter diffraction measurements. A mixture of ferrite, martensite, and retained austenite was observed in the microstructure. It was found that the volume fraction of global retained austenite decreased linearly with the increase of displacement (0 mm–1.05 mm). The evolution of the retained austenite with typical crystal direction ranges with deformation was characterized. Results show that the orientation (111) and (311) account for the highest proportion of retained austenite grains in the undeformed sample and the mechanical stability of the (311) retained austenite grains is the best. Moreover, the retained austenite grains rotated significantly in the early stage of the specimen deformation process (around yielding), and the work hardening of the specimen was weak at this stage, simultaneously.

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The stability of retained austenite at different locations during straining of I&Q&P steel

Cited by 60 publications

References 32 publications

Effect of Different Isothermal Time on Microstructure and Mechanical Property of the Low-Carbon Steel Treated by Dual-Stable C-Mn Partitioning Process

Effect of Different Isothermal Time on Microstructure and Mechanical Property of the Low-Carbon Steel Treated by Dual-Stable C-Mn Partitioning Process

The Impact of Strain Heterogeneity and Transformation of Metastable Austenite on Springback Behavior in Quenching and Partitioning Steel

Quasi-Situ Characterization of Retained Austenite Orientation in Quenching and Partitioning Steel via Uniaxial Tensile Tests

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