Effect of Controlled Cooling on Microstructure and Mechanical Properties of H-Beam

Guo, Fei; Xi-nan, Zhao; Wang, Lina; Wu, Di; Wang, Guodong; Ning, Zhong-liang

doi:10.1016/s1006-706x(13)60142-9

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…Previous research studies [19,20] have discovered that the precipitates in low carbon martensitic stainless steel during tempering are mainly M 23 C 6 , where M represents Cr, Fe and Mo. As is reported, in high-nitrogen martensitic stainless steel, the addition of N postpones the pre-production of carbides, leading to the disappearance of carbides phase [21,22]. Figure 8 illustrates the morphology and distribution of precipitates after tempering at 550°C, 650°C and 750°C.…”

Section: Resultsmentioning

confidence: 99%

Effect of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel

Zhang

et al. 2021

Ironmaking & Steelmaking

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The effects of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel are studied by means of the OM, SEM, XRD and TEM. The results show that the addition of 0.12% N can effectively inhibit the formation of δ ferrite and significantly increase the volume fraction of retained austenite. N can inhibit the precipitation of carbides, but it promotes the precipitation of Cr2N in the grain boundary of original austenite, martensitic lath boundary and grain interior in the 0Cr15Ni6Mo2 with N. The addition of 0.12% N not only increases the tensile strength by at least 9.6% but also increases the elongation and Charpy impact toughness by at least 12.3% and 47.5%, respectively. And N increases the yield ratio and improves the work hardening ability of the test steel. It is considered that the increase of retained austenite, the inhibition of the formation of δ ferrite and the segregation and precipitation of Cr2N at grain boundaries play an important role. Comprehensive mechanical properties are more likely to obtain when tempered in 700-750°C.

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Section: Resultsmentioning

confidence: 99%

Effect of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel

Zhang

et al. 2021

Ironmaking & Steelmaking

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“…1.1 The calculation of temperature field (1) According to the law of conservation of energy, we established the differential equation of heat conduction [3] :…”

Section: The Basic Theory Of Numerical Simulationmentioning

confidence: 99%

“…At present most of mechanical properties of materials are obtained by cooling controlled process. It is indispensable and important part of the production process [1] . H-beam is an important structural section in the industry, more and more concern and attention is growing because of its good mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the H-Beam during Cooling Process

Liu

Hou

2013

AMM

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In order to improve the comprehensive mechanical properties of the steel, the heat treatment software COSMAP is used to simulate the rolling and controlled cooling of H-beam. The numerical simulation shows that the mechanical properties of controlled cooling can be obviously improved, when the cooling rate is controlled at 10°C/s around. Strength and hardness can be improved under the condition of ductility and toughness ensured. Meanwhile the amount of residual austenite can be reduced significantly. It provides a theoretical basis for further optimization of the heat treatment process.

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“…In 2013, Guo et al [9] analyzed temperature fields during both controlled cooling and air cooling and the microstructural mechanical properties for different parts of an H-beam after it was control cooled for 4.5 s, and the lowest and the highest temperature were measured at the edge of the flange and at the R corner, respectively. The microstructure for the different parts of the H-beam consisted of ferrite and pearlite, and the grain size at the R corner was coarser than that at the flange and web.…”

Section: Introductionmentioning

confidence: 99%

Optimal Heat Transfer Coefficient Distributions during the Controlled Cooling Process of an H-Shape Steel Beam

Gan

Jang

2017

Advances in Materials Science and Engineering

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Three-dimensional thermal-mechanical models for the prediction of heat transfer coefficient distributions with different size beams are investigated. H300 × 300, H250 × 250, and H200 × 200 H-shape steel beams are investigated in a controlled cooling process to obtain the design requirements for maximum uniform temperature distributions and minimal residual stress after controlled cooling. An algorithm developed with the conjugated-gradient method is used to optimize the heat transfer coefficient distribution. In a comparison with the three group results, the numerical results indicate that, with the same model and under the same initial temperature ( = 850 ∘ C) and final temperature ( = 550 ± 10 ∘ C), the heat transfer coefficients obtained with the conjugatedgradient method can produce more uniform temperature distribution and smaller residual web stress, with objective functions of the final average temperature ave ± Δ and maximum temperature difference to minimum min{Δ max ( , )}. The maximum temperature difference is decreased by 57 ∘ C, 74 ∘ C, and 75 ∘ C for Case 1, Case 2, and Case 3, respectively, the surface maximum temperature difference is decreased by 60∼80 ∘ C for three cases, and the residual stress at the web can be reduced by 20∼40 MPa for three cases.

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Effect of Controlled Cooling on Microstructure and Mechanical Properties of H-Beam

Cited by 5 publications

References 14 publications

Effect of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel

Effect of nitrogen and tempering temperature on microstructure evolution and mechanical properties of 0Cr15Ni6Mo2 martensitic stainless steel

Numerical Simulation of the H-Beam during Cooling Process

Optimal Heat Transfer Coefficient Distributions during the Controlled Cooling Process of an H-Shape Steel Beam

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