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Bainite
About: Bainite is a research topic. Over the lifetime, 9520 publications have been published within this topic receiving 145305 citations.
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TL;DR: In this paper, three morphologies of martensite in dual-phase microstructure of 0.2% C steel were obtained by different heat treatment cycles and the control on ductility was found to depend on the alignment of the martensites along the tensile axes.
Abstract: Three morphologies of martensite in dual-phase microstructure of 0.2% C steel were obtained by different heat treatment cycles. These morphologies consisting of grain boundary growth, scattered laths, and bulk form of martensite have their distinct patterns of distribution in the matrix (ferrite). In tensile testing martensite particles with these distributions behaved differently. A reasonable work hardening was gained initially during plastic deformation of the specimens. The control on ductility was found to depend on the alignment of martensite particles along the tensile axes. The increased surface area contact of martensite particles with ferrite, in grain boundary growth and scattered lath morphologies, facilitated stress transfer from ductile to hard phase. The ductility in the later part of deformation was dependent on the density of microvoids in the necked region. The microvoids are formed mostly by de-cohesion of martensite particles at the interface. The fracture of martensite particles is less prominent in the process of microvoid formation which predicts high strength of martensite.
59 citations
TL;DR: In this paper, the effect of multi-step ausforming with small strain per pass (<10%) on the overall transformation kinetics, microstructures and tensile properties of a high carbon, silicon rich nanobainite steel was investigated.
59 citations
TL;DR: In this paper, the macro-and micro-viewpoints of a Fe-27%Ni austenitic alloy were evaluated using X-ray diffractometry and electron backscatter diffraction.
59 citations
TL;DR: In this paper, the wear behavior of the bainitic steels has been examined in relation to microstructure and the surface damage experienced by the worn rollers, and it is considered that such studies could lead to new insights into the wear process itself.
59 citations
01 Jan 2013-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the role of microstructure types in fatigue crack growth behaviors in ferrite-pearlite steel and ferrite bainite steel was investigated using in-situ scanning electron microscopy (SEM) and fatigue fractography analysis.
Abstract: The roles of microstructure types in fatigue crack growth behaviors in ferrite–pearlite steel and ferrite–bainite steel were investigated. The ferrite–bainite dual-phase microstructure was obtained by intermediate heat treatment, conducted on ferrite–pearlite hot-rolled low carbon steel. This paper presents the results from investigation using constant stress-controlled fatigue tests with in-situ scanning electron microscopy (SEM), fatigue crack growth (FCG) rate tests, and fatigue fractography analysis. Microscopy images arrested by in-situ SEM showed that the fatigue crack propagation in F–P steel could become unstable more ealier compared with that in F–B steel. The fatigue cracks in ferrite–pearlite were more tortuous and could propagate more freely than that in ferrite–bainite microstructures. However, frequent crack branching were observed in ferrite–bainite steel and it indicated that the second hard bainite phase effectively retarded the crack propagation. The variation of FCG rate ( da / dN ) with stress intensity factor range (Δ K ) for F–P and F–B steels was discussed within the Paris region. It was shown that FCG rate of F–P steel was higher than that of F–B steel. Moreover, the fatigue fracture surface analysis proved that grain boundaries could also play a role in the resistance of crack propagation.
59 citations