Effect of quenching temperature on martensite multi-level microstructures and properties of strength and toughness in 20CrNi2Mo steel

Long, Shaolei; Liang, Yilong; Jiang, Yun; Liang, Yu; Yang, Ming; Yi, Yanliang

doi:10.1016/j.msea.2016.08.065

Cited by 121 publications

(58 citation statements)

References 7 publications

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“…In addition, many reports have suggested that plasticity decreases as the prior austenite coarsens, especially for the brittle fracture. Interestingly, the plasticity of tested steel 20CrNi2Mo did not decrease; instead, as shown in our previous study, it increased as the prior austenite coarsened . Therefore, the aim of the present study is to reveal the relationship between macroscopic plasticity and multilevel microstructures in lath martensite steel for the strain‐controlled fracture.…”

Section: Introductionsupporting

confidence: 50%

“…However, its excellent comprehensive properties depend strongly on the complexity of the multilevel microstructures of the lath martensite in the steel. Because of this, studies that examine the relationship between microstructures and the resulting properties have received an increasing amount of attention . Thus, the goal of this study is to improve the understanding of the role of martensite lath in plasticity, based on previous investigations.…”

Section: Introductionmentioning

confidence: 99%

“…In the 1970s, several studies built relationships between multilevel microstructures and strength/toughness using methods such as a Hall–Petch relationship and electron backscatter diffraction (EBSD) analysis. For example, an early work of Tomita and Okabayashi regarded d p as the primary microstructural parameter responsible for controlling the yield strength and ductile‐brittle transition temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Luo et al reported that block width is the “effective grain size” for controlling toughness in low‐carbon NiCrMoV steel. More recently, other studies have shown that martensite blocks and laths play important roles in the strength and toughness, respectively, through a Hall‐Petch relationship and crack propagation …”

Section: Introductionmentioning

confidence: 99%

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Effective Microstructure Unit in Control of Plasticity during Strain‐Controlled Fracture

Long

Liang

Lin

et al. 2019

steel research int.

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Strain‐controlled fracture is investigated in 20CrNi2Mo steel using the Hall–Petch relationship, electron backscatter diffraction (EBSD), and other techniques. An interesting result is that the ductility of the tested steel increases with a coarsening of prior austenite grains. This finding is in contrast to conventional understanding. Meanwhile, the strain after necking is approximately 2/3 of the total strain, and the value of UC (crack propagation energy per unit volume) reaches 95% of UK (static toughness). The ductility of 20CrNi2Mo steel also depends on crack propagation. Furthermore, the Hall–Petch relationships between ductility and multilevel microstructure demonstrate that lath is the effective control unit of the plasticity of the tested steel. Lath also plays a key role in crack propagation that results from the rotating, bending, and shearing of lath, as confirmed by fracture analysis and EBSD.

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Section: Introductionsupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effective Microstructure Unit in Control of Plasticity during Strain‐Controlled Fracture

Long

Liang

Lin

et al. 2019

steel research int.

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“…It is well known that the effective methods to improve the strength in steel mainly include fine grain strengthening, and precipitation strengthening [20]. The fine grain strengthening is the most effective method of improving the strength.…”

Section: Tensile Strengthmentioning

confidence: 99%

Effect of Tempering Temperatures on Tensile Properties and Rotary Bending Fatigue Behaviors of 17Cr2Ni2MoVNb Steel

Qu¹,

Zhang²,

Lai³

et al. 2018

Metals

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Abstract:With the rapid development of the automotive industry in China, the common gear steels no longer meet the high speed and heavy load requirements of the automotive industry. 17Cr2Ni2MoVNb steel is a new type of gear steel in the automotive industry, but the mechanical properties of 17Cr2Ni2MoVNb are not well documented. In this study, the tensile properties and rotary bending fatigue behaviors of 17Cr2Ni2MoVNb were investigated, (quenched at 860 • C and tempered at 180, 400, 620 • C); the microstructures and fracture surface were analyzed using an optical microscope, scanning electron microscopy and transmission electron microscopy. The results show that at higher tempering temperatures, the tissue was denser, and the residual austenite transformed into lower bainite or tempered martensite. Dislocation density reduced while tempering temperature increased. Moreover, the samples with a tempering temperature of 180 • C exhibited the highest tensile strength of 1456 MPa, in addition to fatigue limits of 730, 700 and 600 MPa at temperatures of 180, 400, and 620 • C, respectively.

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Controlling of reheated quenching temperature of 1000 MPa grade steel plate for hydropower station

Chen

et al. 2019

Materialwissenschaft Werkst

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The strength and toughness of 1000 MPa grade steel plate for hydropower station treated by different reheated quenching temperatures were investigated. With the increasing of reheated quenching temperature, the yield strength and tensile strength increase sharply, whereas the value of impact toughness decreases slowly. The lath martensite with high density dislocations enhances dislocation strengthening. On the contrary, the acicular or block ferrite (soft phase) produced by intercritical quenching reduces the phase transformation strengthening. Moreover, the ferrite has a low solubility of interstitial carbon due to the body‐centered‐cubic lattice structure. The bar‐shaped precipitates occur during the isothermal holding at the intercritical temperature and it will reduce the precipitation strengthening. The ferrite phase and high misorientation boundaries are the main factors that contribute to the toughening of the experimental steel. The lower the reheated quenching temperature is, the higher proportion of ferrite and high misorientation boundaries becomes. Considering the requirements for mechanical properties of 1000 MPa grade steel plate for hydropower station, the optimal temperature of reheated quenching is ∼920 °C.

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Effect of quenching temperature on martensite multi-level microstructures and properties of strength and toughness in 20CrNi2Mo steel

Cited by 121 publications

References 7 publications

Effective Microstructure Unit in Control of Plasticity during Strain‐Controlled Fracture

Effective Microstructure Unit in Control of Plasticity during Strain‐Controlled Fracture

Effect of Tempering Temperatures on Tensile Properties and Rotary Bending Fatigue Behaviors of 17Cr2Ni2MoVNb Steel

Controlling of reheated quenching temperature of 1000 MPa grade steel plate for hydropower station

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