Abstract
This paper presents results of strength and fracture toughness properties of low-carbon high-strength Hardox-400 steel. Experimental tests were carried out for specimens of different thickness at wide temperature range from −100 to 20 °C. The dependences of the characteristic of material strength and fracture toughness on temperature based on experimental data are shown. Numerical calculation of the stress and strain distributions in area before crack tip using the finite element method (FEM) was done. Based on results of numerical calculation and observation of the fracture surfaces by scanning electron microscope (SEM), the critical local stress level at which brittle fracture takes place was assessed. Consideration of the levels of stress and strain in the analysis of the metal state at the tip of the crack allowed to justify the occurrence of the brittle-to-ductile fracture mechanism. On the basis of the results of stretch zone width measurements and stress components, the values of fracture toughness at the moment of crack initiation were calculated.
Highlights
During recent years, new low-carbon ferritic steels have been designed and produced which are characterized by their high yield stress values or high hardness with maintaining a good level of plasticity
To achieve such a high strength, these steels are subjected to thermomechanical processing (TMP) [1,2,3,4,5]
This paper presents a review of the results which were obtained in testing of high-strength steels: steels: S960QC and Hardox-400 since 2009
Summary
New low-carbon ferritic steels have been designed and produced which are characterized by their high yield stress values or high hardness with maintaining a good level of plasticity Development of this type of steel and carrying out research to determine their mechanical properties is of great importance for their applications in various industries, including building construction, automotive, aerospace, and others. To achieve such a high strength, these steels are subjected to thermomechanical processing (TMP) [1,2,3,4,5]. The most frequently studied were the effect of microstructural changes on strength characteristics, plasticity and hardness [6,7,8,9,10,11,12], and less frequently—on impact resistance [13]
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