Abstract In a hot rolled NbTi and a NbTi0.09%Mo micro-alloyed steel, the ratio of yield strength to tensile strength (YS/UTS) was found to be a function of the microstructure and cooling rate in those tests where no coiling simulation and no prior deformation. The coarse bainite or acicular ferrite, which was formed at high cooling rates, raised the YS/UTS ratio under these process
The effect is more pronounced on FS. It is also evident that the overall microstructure becomes finer with increasing copper content. However, it has a weak effect on AF grain size. Increased AF content of the weld metal is in contrast to the results reported by Evans and co-workers . (PDF) Particularities of the formation of bainite and Download Free PDF. Download Free PDF. Particularities of the formation of bainite and martensite/austenite phase in low carbon low alloy steels during continuous cooling. Effect of increased N content on microstructure and tensile properties of low-C V-microalloyed steels.
Feb 15, 2018 · Abstract. The martensite-austenite constituent (MA) originates from carbon-enriched and untransformed austenite surrounded by bainite and is known to deteriorate the toughness of bainitic steel. The relationship between MA and bainite formation in low-carbon low-alloy steel was investigated with respect to the effects of cooling rate and Nb addition, as well as the relationship between the MA Correlation of martensiteaustenite constituent and The effect of nitrogen content on the martensite-austenite (M-A) constituent in low-carbon Mo-V-N steels produced by an isothermal transformation, + (metastable austenite), at 550 °C
Constant increase of energy consumption in modern industry requires construction of heavily loaded pipelines with high throughput capacity. Therefore, high-strength steels should be used for the cost reasons. Additionally, the pipelines are also often used in the areas with cold climate and high seismicity. Therefore, strength and plasticity reduction is unacceptable. Effect of morphology of martensiteaustenite phase on Dec 02, 2013 · Effect of martensiteaustenite constituent on toughness of simulated inter-critically reheated coarse-grained heat-affected zone in X70 pipeline steel X.J. Di et al. Science and Technology of Welding and Joining
micromechanaism acting at M-A constituents depends on the local stress triaxiality ratio. They also found that the nature of the particles, which were mainly elongated austenite particles located between bainite laths or brittle blocky martensite particles, only plays an important role at low strain (<5%) or low stress triaxiality 29. For low Effect of the morphology of the martensite-austenite phase In multipass welding, the intercritically reheated coarse grained heat affected zone demonstrates the worst toughness in welded joint, since it contains a high-carbon martensite with some retained austenite, known as M-A phase, which is brittle and associated with the high cooling rates following welding. The purpose of the present work was to explore those aspects of the morphology of the M-A
Effect of increased nitrogen content on continuous cooling transition of in hot-deformed low-C MoVTi steels Xin-ping Xiao , Gen-hao Shi , S. Zhang , Y. Gao , Q. Wang , F. Zhang Materials Science High-resolution characterization of the martensite Oct 01, 2018 · High-resolution characterization of the martensite-austenite constituent in a carbide-free bainitic steel. Auto-tempering effects ranging from C clustering to carbide formation in martensite Fine structure characterization of martensite/austenite constituent in low-carbon low-alloy steel by transmission electron forward scatter diffraction.
The multiphase microstructure of carbide-free bainitic steels comprises bainitic ferrite laths, retained austenite with different morphologies, a minor fraction of carbides and so-called martensite-austenite areas, which partially transform during the last cooling step. While the other constituent received much attention, little is known about the structure of the martensite-austenite Microstructure of martensiteaustenite constituents in Jul 19, 2013 · AbstractMicrostructure and fracture properties relationships have been investigated in the heat affected zones (HAZs) of a high strength low alloy steel used for offshore applications. Metallographic examinations of simulated HAZ microstructures were conducted to investigate the detailed microstructure of the martensiteaustenite (MA) constituents.
The present study deals with the effect of constituent phase (austenite and martensite) characteristics on the microstructure and mechanical properties of an advanced high strength steel obtained t What is Ferrite, Cementite, Pearlite , Martensite, Austenite1. Ferrite:Iron which contains little or no carbon is called ferrite. It is very soft and ductile and is known as alpha iron by the metallurgists. Ferrite is present to some extent in a great range of steels, particularly those low in carbon content, and it is also present, in soft
Analysis of martensiteaustenite constituent and its effect on toughness in submerged arc welded joint of low carbon bainitic steel Liangyun Lan Chunlin Qiu Dewen Zhao Xiuhua Gao Linxiu Du Received:2 October 2011/Accepted:13 February 2012/Published online:29 February 2012