Influence of initial quenching on the microstructure and mechanical properties of quenched and partitioned ferritic stainless steels

Raami, Lassi; Peura, Pasi

doi:10.1016/j.msea.2022.143339

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…Rough blocky RA is the main component in the Q&P350 process, and the stability of RA is related to the uniformity of the carbon distribution. The location and size of martensite are also determined by the location and concentration of carbide precipitates [ 36 ]. The distribution of carbide precipitates in Figure 5 a is even, while carbon distribution is less uniform in Figure 5 b,c, which demonstrates an adequate carbon redistribution process and improvement in the stability of blocky RA.…”

Section: Resultsmentioning

confidence: 99%

Study of Quenching and Partitioning (Q&P) and Ultrasonic Surface Rolling (USR) Process on Microstructure and Mechanical Property of a High-Strength Martensitic Steel

Hou,

Duan,

et al. 2024

Materials

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Steel with a combination of strength and plasticity is prevalently demanded for lightweight design and emission reductions in manufacturing. In this study, a high-strength Cr-Ni-Mo martensitic steel treated by quenching and partitioning (Q&P) and ultrasonic surface rolling (USR) processes was studied for both strength and plasticity enhancement. Specimens were austenitized at 850 °C and then quenched to 240 °C via cooling by water, oil, and normalization in quenching. This was followed by partitioning, in which two groups of specimens were heated to 370 °C and 350 °C for 45 min, respectively. At last, all the specimens were quenched to room temperature with the same methods of quenching. The highest tensile strength increased from 681.73 MPa to 1389.76 MPa when compared to as-received (AR) steel after the Q&P process. The USR process with a static force of 800 N further improved the tensile strength of specimens with high tensile strength after the Q&P process, which improved from 1389.76 MPa to 1586.62 MPa and the product’s strength and elongation (PSE) increased from 15.76 GPa% to 15.9 GPa%, while the total elongation showed a mitigatory decrease from 11.34% to 10.02%. Tensile fractures were also studied and verified using a combination of strength and plasticity after a combined process of Q&P and USR.

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Section: Resultsmentioning

confidence: 99%

Study of Quenching and Partitioning (Q&P) and Ultrasonic Surface Rolling (USR) Process on Microstructure and Mechanical Property of a High-Strength Martensitic Steel

Hou,

Duan,

et al. 2024

Materials

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“…To reduce the formation rate of carbides within the 120-450 °C temperature range, which competes with the formation of BF, the addition of an appropriate amount of silicon or aluminum is required. [6][7][8] The primary goals of Q&P processing are to generate supersaturated martensite through initial quenching and promote carbon transfer from martensite to adjacent austenite during partitioning at elevated temperatures. This process also aids in the transformation of residual austenite into BF and carbide.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the formation rate of carbides within the 120–450 °C temperature range, which competes with the formation of BF, the addition of an appropriate amount of silicon or aluminum is required. [ 6–8 ]…”

Section: Introductionmentioning

confidence: 99%

Enhancing Mechanical Properties of Carbon–Silicon Steel through Two‐Stage Quenching and Partitioning with Bainitic Transformation: Ultimate Tensile Strength of 1875 MPa and Total Elongation of 8.03%

Masoumi,

Centeno,

Tressia

et al. 2024

steel research int.

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To achieve the desired microstructural properties, the ongoing development and innovation in new structural steels require novel thermal processing. This study aims to improve the mechanical properties of a commercial spring carbon–silicon steel by tailoring its microstructure through a process involving quenching and partitioning (Q&P) followed by bainitic transformation. A two‐stage Q&P process is proposed to generate a nanoscale dispersion of stable retained austenite and carbides within the tempered martensite and bainite microstructure. The resulting tensile properties demonstrate a yield strength of 1280 MPa, an ultimate tensile strength of 1875 MPa, and a total elongation of 8.03%. These values surpass those of conventional spring 9254 steel, highlighting the effectiveness of the thermal treatment design. Microstructure analysis reveals the presence of tempered martensite, bainite sheaves, nanoscale carbides, and aggregates of retained austenite. Moreover, the resulting body‐centered cubic matrix exhibits minimal lattice tetragonality of ≈1.0051, coupled with stable retained austenite featuring a carbon concentration of ≈3.42 ± 0.5 wt%, resulting in outstanding strength–ductility properties. These findings indicate that the proposed two‐stage Q&P process, followed by bainitic transformation, significantly enhances the mechanical properties of carbon–silicon steels, making it a promising candidate for high‐performance spring applications.

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“…Similar research results were obtained in Q&P-treated ferritic stainless steels. 40 The presence of Cr-carbides at prior austenite grain boundaries leads to carbon depletion in their surroundings, which implies a local increase in the Ms temperature at these sites. This explains the formation of martensite only at prior austenite grains shown in Figure 9 for the specimen HMn quenched to 125°C, where only 0.07 volume fraction of M1 transformed all at grain boundaries.…”

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confidence: 99%

Microstructure development of quenching and partitioning-processed martensitic stainless steels with different manganese content

Li,

Kwakernaak,

Smith

et al. 2024

Materials Science and Technology

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This work presents an investigation of the microstructure development during the application of the quenching and partitioning (Q&P) process to two stainless steels with different Mn content. The results are compared with calculations based on the constrained carbon equilibrium theory, paying special attention to the presence of reactions competing for the carbon available for partitioning and to the effect of alloying element segregation. Results show that chromium carbides must be considered when accounting for the carbon available for austenite stabilisation. Moreover, manganese/chromium segregation bands play an important role in the microstructure development, particularly in martensite formation, with important consequences in the microstructure development during the following processing steps.

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Influence of initial quenching on the microstructure and mechanical properties of quenched and partitioned ferritic stainless steels

Cited by 7 publications

References 35 publications

Study of Quenching and Partitioning (Q&P) and Ultrasonic Surface Rolling (USR) Process on Microstructure and Mechanical Property of a High-Strength Martensitic Steel

Study of Quenching and Partitioning (Q&P) and Ultrasonic Surface Rolling (USR) Process on Microstructure and Mechanical Property of a High-Strength Martensitic Steel

Enhancing Mechanical Properties of Carbon–Silicon Steel through Two‐Stage Quenching and Partitioning with Bainitic Transformation: Ultimate Tensile Strength of 1875 MPa and Total Elongation of 8.03%

Microstructure development of quenching and partitioning-processed martensitic stainless steels with different manganese content

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