Journal ArticleDOI
Low cycle fatigue behavior of a multiphase microalloyed medium carbon steel: comparison between ferrite–pearlite and quenched and tempered microstructures
TLDR
In this article, a multiphase microstructure was developed in a V-bearing medium carbon microalloyed steel using a two-step cooling and annealing (TSCA) treatment following finish forging.Abstract:
In an attempt to improve fatigue and fracture resistance, a multiphase (ferrite–bainite–martensite) microstructure was developed in a V-bearing medium carbon microalloyed steel using a two-step cooling and annealing (TSCA) treatment following finish forging. The monotonic, cyclic stress–strain and low cycle fatigue behavior of this steel are reported. These results are compared with those of ferrite–pearlite and tempered martensite microstructures obtained by air cooling (AC) and quenching and tempering (Q&T), respectively. The tensile properties of the multiphase microstructure are superior to those of the ferrite–pearlite and the Q&T microstructures. Under cyclic loading, the ferrite–pearlite microstructure showed hardening at higher total strain amplitudes (≥0.7%) and softening at lower total strain amplitudes (<0.7%). The quenched and tempered and the ferrite–bainite–martensite (TSCA) microstructures displayed cyclic softening at all total strain amplitudes employed. Despite the cyclic softening, the ferrite–bainite–martensite structure was cyclically stronger than the ferrite–pearlite and the Q&T microstructures. Bilinearity in the Coffin–Manson plots was observed in Q&T and the multiphase TSCA conditions. An analysis of fracture surface provided evidence for predominantly ductile crack growth (microvoid coalescence and growth) in the ferrite–pearlite microstructure and mixed mode (ductile and brittle) crack growth in Q&T and the multiphase TSCA microstructures.read more
Citations
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Journal ArticleDOI
Influence of silicon content on the precipitation of secondary carbides and fatigue properties of a 5%Cr tempered martensitic steel
Denis Delagnes,Denis Delagnes,Pascal Lamesle,Marie-Hélène Mathon,N Mebarki,N Mebarki,Christophe Levaillant +6 more
TL;DR: In this paper, the effect of silicon on the stability of secondary carbides was studied using transmission electron microscopy and small-angle neutron scattering, and it was concluded that silicon has a detrimental effect as it shifts the secondary hardening peak towards lower tempering temperatures.
Journal ArticleDOI
Modelling wear and crack initiation in rails
Francis Franklin,Ajay Kapoor +1 more
TL;DR: In this paper, the authors investigate the optimum combination of wear and grinding that both maintains railhead profile and prevents cracks from growing, which is a significant safety and cost-efficiency concern to the railway industry.
Journal ArticleDOI
High cycle fatigue behaviour of a multiphase microalloyed medium carbon steel: a comparison between ferrite–pearlite and tempered martensite microstructures
TL;DR: In this paper, a mutiphase microstructure was developed in a V-bearing medium carbon microalloyed (MA) steel through a two-step cooling process that was followed by an annealing treatment.
Journal ArticleDOI
Mechanical behavior of CrMo steel with tempered martensite and ferrite–bainite–martensite microstructure
TL;DR: In this article, a correlation between the microstructure and mechanical properties of 42CrMo4 steel, with two different microstructures, was concerned with a correlation of the micro-structure with mechanical properties.
Journal ArticleDOI
Uniaxial cyclic deformation behaviour of SA 333 Gr 6 piping steel at room temperature
TL;DR: In this paper, the cyclic deformation behavior of SA333 Gr 6 piping material subjected to room temperature stress and strain controlled cyclic tests has been investigated and quantitatively explained in terms of a synergistic interaction between stress rate and stress ratio during cyclic softening.
References
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Book
Fracture and Fatigue Control in Structures: Applications of Fracture Mechanics
J. M. Barsom,Stanley T. Rolfe +1 more
Journal ArticleDOI
Microstructures and properties of direct-cooled microalloy forging steels
TL;DR: In this article, processing approaches for the production of direct-cooled microalloyed forging steels are considered with an emphasis on features that control strength and toughness, and features that may contain a significant amount of retained austenite.
Journal ArticleDOI
Cyclic stress strain relations and strain-controlled fatigue of 4140 steel
TL;DR: The strain controlled low cycle fatigue properties and cyclic stress-strain response of a 4140 steel were investigated as functions of tempering temperature in this paper, and it was suggested that the endurance limit is essentially equal to the cyclic yield stress.
Journal ArticleDOI
Influence of ferrite-martensite microstructural morphology on the low cycle fatigue of a dual-phase steel
TL;DR: In this article, a CMnSi dual-phase steel has been heat-treated to yield three different microstructures, i.e., a dispersion of martensite in fine-grained ferrite (Type I), a continuous network of Martensite around ferrite grains (Type II) and martensites islands encapsulated in a ferrite matrix (Type III), and low cycle fatigue tests have been conducted.
Journal ArticleDOI
Cyclic deformation of ferritic steel. I, Stress-strain response and structure evolution
Hans Jørgen Roven,E. Nes +1 more
TL;DR: The complete CSS-curve has been established for a low alloyed structural steel tested under plastic strain control as discussed by the authors, which can be divided into three separate regimes with a plateau region between cyclic strain levels of 10−4 and 8·10−4.