Effect of Boron Micro-alloying on Microstructure and Corrosion Behavior of Dual-Phase Steel
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AbstractAbstractAn attempt has been made to investigate the effects of aluminium, titanium, nitrogen, and boron on the hardenability of boron-bearing medium-carbon steels. It was found that not only titanium but also boron had the scavenging effect for dissolved nitrogen. A parameter designated as boron potential (Bp = xB−11/14(xN−14/47·9XTi), where xB, xN, and xTi are the total boron, nitrogen, and titanium content, respectively) was chosen to evaluate and predict the boron hardenability effect. From the results of this study, boron potential is a parameter useful in discerning the optimization of contents of titanium, nitrogen, and boron for the development of boron steels having excellent hardenability.MST/655
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AbstractAbstractA review has been prepared of the metallurgical factors affecting the hardenability and mechanical properties of boron-treated low-alloy steels. Detailed experimental work has been carried out to clarify the following controversial aspects of these steels: (a) occurrence of boron in steels; (b) influence of boron content on hardenability; (c) interaction of carbon and boron on hardenability; (d) case carburizing of boron steels; (e) impact properties of boron steels; (f) loss of hardenability in boron steels due to high-temperature heat treatments
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Dealing boron-treated steels, with the Medium-Carbon (0.3∼0.4%), the maximum hardenability was gained by the addition of an order of about 0.003%B; and with increase of the nitrogen content in steels, the desirable effect of boron on the hardenability decreased sharply, and the effect completely disappeared when the nitrogen content exceeded an order of 0.02%.And when the small amonnt of Al(0.1%) or Ti(0.03%) was added to the steels prior to the addition of boron, the effect of boron usually appeared more sharply, because they acted as the fixers of nitrogen.
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ABSTRACT The effect of martensite morphology on the impact and tensile properties of dual phase steels with a 0.25 volume fraction of martensite ( V m ) under different heat treatments was investigated. These treatments are direct quenching (DQ) and step quenching (SQ) that result in different microstructures and mechanical properties. To process dual phase steels, a low carbon manganese steel was used. At first the banding present in the initial steel was eliminated, then the two different heat treatments were applied. To reach a 0.25 volume fraction of martensite a variation of intercritical annealing temperatures was adopted for both treatments that allowed the evolution of different volume fraction of martensite. Phase analysis showed that an intercritical temperature of 725 °C (between A 3 , A 1 ) gives the desired 0.25 V m of martensite. A comparison of impact, tensile and ductile–brittle transition temperature (DBTT) indicates that the microstructure of the direct treatment has a better toughness. The DBTT for the DQ and SQ treatment is −49 and −6 °C, respectively.
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Abstract This article provides a detailed discussion on the effect of boron in heat-treated steel and thermomechanically-simulated steel. It describes the boron hardenability mechanism and the effect of composition and heat treatment parameters on boron hardenability. The article examines the hardening behavior of unalloyed boron steel and low-alloyed boron steel in heat treatment experiments by varying the austenitizing temperatures and cooling conditions. It also discusses the applications of boron steels.
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The microstructure,tensile properties as well as fracture mechanism of high-martensite content dual-phase steel were studied by OM,SEM and tension test.Results show that with the increase of intercritical quenching temperature in(α+γ) range,the volume fraction of martensite continuously rises,enhanceing the strength of the steel.In addition,the volume fraction of martensite exhibits a certain influence on transformsation from ductile to brittle fracture.Finally,microscopic holes are formed near the fracture surface,the morphology of which is changed with the increase of volume fraction of martensite.
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