Mariana POP, Adriana NEAG, Dan FRUNZA, Florin POPA


To better understand the tensile deformation and fracture behavior of 42CrMo4 steel during hot processing, uniaxial tensile tests at elevated temperatures and different strain rates were performed. The behavior of 42CrMo4 steel was studied by hot tensile tests with the deformation temperature range of 700 – 1000 °C and strain rate range of 0.006 - 0.1 s-1. Effects of deformation condition on the flow behavior, microstructure evolution and fracture characteristic were analyzed. The results indicated that the flow stress was sensitive to the deformation condition. Scanning electron microscope (SEM) images showing both the fracture surfaces and the matrix near the fracture section indicated the ductile nature of the material. However, the fracture mechanisms varied according to the deformation condition, which influences the dynamic recrystallization (DRX) condition.

Key words: hot tensile test, tensile strength, strain rate, ductile fracture, SEM.

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D. Chaouch, S. Guessasma , A. Sadok , Finite Element simulation coupled to optimisation stochastic process to assess the effect of heat treatment on the mechanical properties of 42CrMo4 steel, Materials and Design, 2012; 34: 679-684.

M. Nouari, A. Molinari, Experimental verification of a diffusion tool wear model using a 42CrMo4 steel with an uncoated cemented tungsten carbide at various cutting speeds, Wear, 2005; 259: 1151–9.

P. Starke, F. Walther, D. Eifler, New fatigue life calculation method for quenched and tempered steel SAE 4140, Mater. Sci. Eng. A, 2009; 523:246–52.

Y.C. Lin, Yan-Xing Liu, Ge Liu, Ming-Song Chen, Yuan-Chun Huang, Prediction of Ductile Fracture Behaviors for 42CrMo Steel at Elevated Temperatures, JMEPEG, 2015; 24: 221–228.

Y.C. Lin, M.S. Chen, J. Zhong, Study of Static Recrystallization Kinetics in a Low Alloy Steel, Comput. Mater. Sci., 2008; 44: 316–321.

Y.C. Lin, M.S. Chen, Study of Microstructural Evolution During Static Recrystallization in a Low Alloy Steel, J. Mater. Sci., 2009; 44: 835–842.

G.Z. Quan, Y. Wang, Y.Y. Liu, J. Zhou, Effect of Temperatures and Strain Rates on the Average Size of Grains Refined by Dynamic Recrystallization for As-Extruded 42CrMo Steel, Mater. Res., 2013; 16: 1092–1105.

M.S. Chen, Y.C. Lin, X.S. Ma, The Kinetics of Dynamic Recrystallization of 42CrMo Steel, Mater. Sci. Eng. A, 2012; 556: 260–266.

Y.C. Lin, M.S. Chen, J. Zhong, Microstructural Evolution in 42CrMo Steel During Compression at Elevated Temperatures, Mater. Lett., 2008; 62: 2132–2135.

Y.C. Lin, M.S. Chen, J. Zhong, Study of Metadynamic Recrystallization Behaviors in a Low Alloy Steel, J. Mater. Process. Technol., 2009; 209: 2477–2482.

Y.C. Lin, M.S. Chen, J. Zhong, Prediction of 42CrMo Steel Flow Stress at High Temperature and Strain Rate, Mech. Res. Comm., 2008; 35: 142–150.

Y.Y. Li, S.D. Zhao, S.Q. Fan, B. Zhong, Plastic Properties and Constitutive Equations of 42CrMo Steel During Warm Forming Process, Mater. Sci. Technol., 2014; 30: 645–652.

Yuan-Chun Huang, Y.C. Lin, Jiao Deng, Ge Liu, Ming-Song Chen, Hot tensile deformation behaviors and constitutive model of 42CrMo steel, Materials & Design, 2014; 53: 349–356.

Y.C. Lin, X.M. Chen, A crtitical review of experimental results and constitutive descriptions for metals and alloys in hot working, Mater Des 2011; 32: 1733–59.

A. Momeni, K. Dehghani, G.R. Ebrahimi, Modeling the initiation of dynamic recrystallization using a dynamic recovery model, J Alloy Comp, 2011; 509: 9387–93.

S.M. Seyed, S. Serajzadeh, A neural network model for prediction of static recrystallization kinetics under non-isothermal conditions, Comp Mater Sci., 2010; 49: 773–81.

Z.Q. Sheng, R. Shivpuri, Modeling flow stress of magnesium alloys at elevated temperature, Mater. Sci. Eng. A, 2006; 419: 202–208.

R.E. Smallman, R.J. Bishop, 2002. Modern Physical Metallurgy and Materials Engineering, Sixth ed. Butterworth–Heinemann.

Y.C. Lin, Ming-Song Chen, Jue Zhong, Effect of temperature and strain rate on the compressive deformation behavior of 42CrMo steel, J. Mater. Process. Technol., 2008; 205: 308–315.

M. Pop, D. Frunza, F. Popa, A. Neag, Aspects Regarding the Hot Fracture Behavior of 42CrMo4 Alloy, Roumanian Journal of Phisycs, 2017; 62: 1-13.

ASM Handbook, Vol 12, Fractography, ASM International.


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