One-step quenching and partitioning treatment of a commercial low silicon boron steel

Kong, Hui; Chao, Qi; Cai, Minghui; Pavlina, Erik J.; Rolfe, Bernard; Hodgson, Peter; Beladi, Hossein

doi:10.1016/j.msea.2017.09.038

Cited by 45 publications

(19 citation statements)

References 41 publications

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“…On the other hand, the center region (CR) was found to have bainite structure in addition to martensite in the two alloys ( Figure 2 c,d). It is already reported that a temperature gradient typically exists from the surface to the core in the DQ process and this induces auto-tempering in CR [ 12 , 13 , 14 , 15 , 23 , 24 ]. The bainite fractions in the CR of the alloys A and B were measured to be 14.71 vol.…”

Section: Resultsmentioning

confidence: 99%

“…The DQ process is one of the thermo-mechanically controlled processes (TMCPs) and a novel and effective method to fabricate high-strength and high-performance steel. This process involves spraying of pressurized water immediately after hot forging or hot forming to produce boards [ 12 , 13 , 14 , 15 ]. In this process, during hot forming, recrystallization takes place in the austenite phases, which results in grain refinement.…”

Section: Introductionmentioning

confidence: 99%

“…Tensile properties and fracture toughness of direct-quenched steels have already been reported in the past [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Considering their superior properties of tensile and fracture toughness, DQ steels can be used in automobile and vessel parts, armored vehicle shells, and construction materials.…”

Section: Introductionmentioning

confidence: 99%

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Hot-Rolling and a Subsequent Direct-Quenching Process Enable Superior High-Cycle Fatigue Resistance in Ultra-High Strength Low Alloy Steels

et al. 2020

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The current study investigated the effect of hot rolling reduction rate of ultra-high strength low alloy steel manufactured via the direct quenching process on microstructure, tensile and high-cycle fatigue properties of the alloy. In order to control the reduction rate of ultra-high strength steels (UHSSs) differently, the steels were produced with two different thicknesses, 6 mm (46.2%—reduction rate, A) and 15 mm (11.5%—reduction rate, B). Then, the two alloys were directly quenched under the same conditions. Both the UHSSs showed martensite in the near surface region and auto-tempered martensite and bainite in the center region. Tensile results showed that alloy A with higher fraction of finer martensite had higher yield strength by about 180 MPa (1523 MPa) than alloy B. The alloy A was also found to possess a higher tensile strength (~2.1 GPa) than alloy B. In addition, alloy A had higher strength than B, and the elongation of A was about 4% higher than that of alloy B. High-cycle fatigue results showed that the fatigue limits of alloys A and B were 1125 MPa and 1025 MPa, respectively. This means that alloy A is excellent not only in strength but also high-cycle fatigue resistance. Based on the above results, the correlation between the microstructure and deformation behaviors were also discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hot-Rolling and a Subsequent Direct-Quenching Process Enable Superior High-Cycle Fatigue Resistance in Ultra-High Strength Low Alloy Steels

et al. 2020

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“…A schematic of processing routes of cold rolled and hot rolled Q&P steels is illustrated in Figure . It can be seen from Figure a that the conventional processes included complicated steps and the carbon partitioning was completed by one step at QT or two‐steps at an elevated temperature, which was difficult to achieve uniform temperature for a large scale industrial coils within several minutes. In 2008, Thomas et al proposed a new idea of carbon partitioning during non‐isothermal treatment and it was possible to create Q&P microstructures and properties directly off of the hot mill.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Carbon Partitioning during Non‐Isothermal Treatment and Mechanical Properties of the First Industrial Coils of Hot Rolled Quenched and Partitioned Steel

Chen

Kang

et al. 2019

steel research int.

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In this study, an energy-efficient processing route involving hot rolling, direct quenching, and air cooling partitioning (DQ&P) is proposed for the large-scale industrial production. The carbon partitioning is completed through waste heat of the steel coils. The effect of quenching temperature (QT) and the kinetics of non-isothermal carbon partitioning were investigated in a low carbon steel 0.19C-1.5Si-1.6Mn (wt%). A stable volume fraction of retained austenite (RA) %11.1-13.5% is obtained in the QT range of %240-360 C, which provides a wide quenching window for industrial production. In addition, when the QT was 320 C, the carbon partitioning was adequate at cooing rate of less than 1 C s À1 and the volume fraction of RA was more than 11%. When the cooling rate is increased to 5 and 10 C s À1 , %10% RA with high carbon content of %1.3 wt% is interestingly obtained. A large scale industrial coils of hot Q&P (Quenched and Partitioned) steel is successfully produced using a commercial steel 0.13C-1.2Si-1.5Mn-0.25Cr (wt%). The mechanical properties are uniform for the entire steel coil with tensile strength of %1258-1319 MPa and total elongation of %13.7-16%. The present work confirms the viability to introduce Q&P process in the hot rolling production line.

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“…The main disadvantage of TRIP and TWIP steels is their high cost due to a high content of alloying elements. QP steels intensively studied for the last 10 to 15 years were designed mainly to be applied in the car industry for thin-walled or sheet parts [16,17]. The optimal steel for massive engineering parts should contain less than 8 wt% of alloying elements, have sufficient hardenability and provide high strength and plasticity.…”

Section: Introductionmentioning

confidence: 99%

Improving the impact toughness of the Hy-Tuf steel by austempering

Майсурадзе¹,

Рыжков²

2018

AIP Conference Proceedings

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The microstructure and mechanical properties of the high-strength Hy-Tuf steel are studied after different heat treatment modes -conventional oil quenching and tempering, austempering in the bainite transformation temperature range. It is shown that the tempering embrittlement of the Hy-Tuf steel can be observed at temperatures ranging between 400 and 500 °C. The highest impact toughness of the studied steel for the case of conventional oil quenching and tempering (1.2 MJ/m 2 ) can be achieved after high temperature tempering (600 °C), which also leads to the deterioration of tensile strength down to 800…900 MPa. The unique combination of high tensile strength (above 1300 MPa), elongation (up to 15%) and impact toughness (1.1 MJ/m 2 ) is obtained after austempering at a low transformation temperature. Mechanics, Resource and Diagnostics of Materials and Structures (MRDMS-2018)AIP Conf.

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One-step quenching and partitioning treatment of a commercial low silicon boron steel

Cited by 45 publications

References 41 publications

Hot-Rolling and a Subsequent Direct-Quenching Process Enable Superior High-Cycle Fatigue Resistance in Ultra-High Strength Low Alloy Steels

Hot-Rolling and a Subsequent Direct-Quenching Process Enable Superior High-Cycle Fatigue Resistance in Ultra-High Strength Low Alloy Steels

Kinetics of Carbon Partitioning during Non‐Isothermal Treatment and Mechanical Properties of the First Industrial Coils of Hot Rolled Quenched and Partitioned Steel

Improving the impact toughness of the Hy-Tuf steel by austempering

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