Mechanical properties and dynamic constitutive model of 42CrMo steel

Zhu, Zhiwu; Lu, Yesen; Xie, Qijun; Li, Dingyuan; Gao, Ning

doi:10.1016/j.matdes.2017.01.066

Cited by 74 publications

(18 citation statements)

References 25 publications

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“…where a-crack length, mm; N-Number of cycles; da/dN-fatigue crack propagation rate, mm/cycle; K-crack tip stress intensity factor, MPaÁm 0.5 ; C, m-material constant. Equation (2) can be obtained by taking the logarithm of both sides of equation (1).…”

Section: Fatigue Crack Propagation Experimentsmentioning

confidence: 99%

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Fatigue crack propagation experiment and numerical simulation of 42CrMo steel

Dong

Wei

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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42CrMo steel is widely used in ultrahigh-strength structures such as low-speed heavy-duty gears. Mastering the fatigue crack propagation law has important significance for predicting structural fatigue life. Firstly, the fatigue crack propagation experiment is used to obtain the upper and lower thresholds value of type I fatigue crack propagation of 42CrMo steel compact tensile specimen under the alternating load of stress ratio R = 0.1. The Paris formula describing the relationship between the fatigue crack propagation rate and the crack tip stress intensity factor between the upper and lower thresholds value is obtained. Scanning electron microscopy was used to observe the microscopic features of different stages of fatigue fracture. The results show that the twin boundary can provide a place for crack initiation; the defects in the material can promote the initiation and extension of fatigue cracks. The fatigue crack propagation of 42CrMo steel compact tensile specimens was numerically simulated by the finite element method. The relationship between the crack tip stress intensity factor and the crack length was obtained. The analysis results show that the crack tip stress intensity factor calculated by the plane finite element method differs slightly from the experimental results during the stable extension stage. After correction, the correlation coefficient between the numerical simulation correction value and the crack tip stress intensity factor value obtained by the experiment is 0.9926. Finally, the fatigue crack propagation rate corresponding to the crack tip stress intensity factor in the finite element results is calculated by the Paris formula and briefly analyzed. Compared with the experimental results, it shows that the numerical simulation is consistent with it, indicating the accuracy of the numerical simulation method, which can effectively predict the initiation and propagation of fatigue cracks in 42CrMo steel compact tensile specimens.

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Section: Fatigue Crack Propagation Experimentsmentioning

confidence: 99%

“…42CrMo steel has ultrahigh strength and toughness. 1,2 After quenching and tempering, it has higher fatigue limit and resistance to multiple impacts. It is widely used in structures with high strength.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack propagation experiment and numerical simulation of 42CrMo steel

Dong

Wei

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In recent years, researchers have studied the mechanical properties of other materials, such as A533B steel [20], 42CrMo steel [21], TWIP steel [22], 603 steel [23], 316L stainless steel [24,25], beryllium copper [26], Ti-6Al-4V alloy [27], Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy [28], aluminum alloys [29,30], and Al-Mg-Si alloy [31] by quasi-static and SHPB tests under different strain rates and temperatures. However, there is a lack of investigation on the dynamic mechanical properties of Q345B steel under different strain rates and ambient temperatures, and there is no suitable constitutive model to describe the dynamic mechanical properties of Q345B steel material.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on mechanical behaviors of Q345B steel material over wide ranges of strain rates and temperatures

Jiang

Wang

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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In the present study, the stress-strain relationships of Q345B steel with the coupling effect of temperature and strain rate were primarily investigated. First, the quasi-static tensile test and dynamic impact compression test were performed using the 810 material test system and the split Hopkinson pressure bar device, respectively, at temperatures ranging from 25 to 700 °C and the strain rate ranging from 0.001 to 4000 s −1. Second, thermal and strain-rate effects on the mechanical behavior of Q345B steel material steel were studied. It was reported that Q345B steel can be significantly softened with temperatures and hardened with strain rates. Finally, a modified Johnson-Cook (J-C) model was developed to describe the nonlinear mechanical behavior of Q345B steel material over a wide range of strain rates and temperatures.

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“…The 42CrMo (American grade: AISI 4140) is a commonly used ultrahigh-strength steel. Due to its high strength, toughness, and hardenability, 42CrMo steel is widely used in quenched and tempered heavy forgings to build components such as pressure vessels, gears, vehicle axles, and deep oil drilling rod subs [8,9]. However, their corrosion resistance is relatively poor and this material is prone to corrosion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Corrosion Pits on Residual Fatigue Life for 42CrMo Steel

Liu

Xie

et al. 2019

Materials

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The effect of pre-corrosion pits on residual fatigue life for the 42CrMo steel (American grade: AISI 4140) is investigated using the accelerated pre-corrosion specimen in the saline environment. Different pre-corroded times are used for the specimens, and fatigue tests with different loads are then carried out on specimens. The pre-corrosion fatigue life is studied, and the fatigue fracture surfaces are examined by a surface profiler and a scanning electron microscope (SEM) to identify the crack nucleation sites and to determine the size and geometry of corrosion pits. Moreover, the stress intensity factor varying with corrosion pits in different size parameters is analyzed based on finite element (FE) software ABAQUS to derive the regression formula of the stress intensity factor. Subsequently, by integrating the regression formula with the Paris formula, the residual fatigue life is predicted and compared with experimental results, and the relationship of the stress intensity factor, pit depth, and residual fatigue life are given under different corrosion degrees. The fatigue life predicted by the coupled formula agrees well with experiment results. It is observed from the SEM images that higher stress amplitude and longer pre-corroded time can significantly decrease the residual fatigue life of the steel. Additionally, the research work has brought about the discovery that the rate of crack extension accelerates when the crack length increases. The research in this paper also demonstrates that the corrosion pit size can be used as a damage index to assess the residual fatigue life.

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Mechanical properties and dynamic constitutive model of 42CrMo steel

Cited by 74 publications

References 25 publications

Fatigue crack propagation experiment and numerical simulation of 42CrMo steel

Fatigue crack propagation experiment and numerical simulation of 42CrMo steel

Experimental investigation on mechanical behaviors of Q345B steel material over wide ranges of strain rates and temperatures

Effect of Pre-Corrosion Pits on Residual Fatigue Life for 42CrMo Steel

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