Effect of composition and thermomechanical processing on the ageing characteristic of copper‐bearing HSLA steel

Banerjee, M. K.; Ghosh, Dipankar; Datta, Someswar

doi:10.1034/j.1600-0692.2000.d01-25.x

Cited by 14 publications

(9 citation statements)

References 7 publications

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“…These results were confirmed by the literature [6]: this loss in the age hardening can be associated to copper precipitation in the strain hardened metastable austenite, at temperatures lower than the Ar 3 point, which did not promotes hardening. The increase in the strain hardening degree of austenite due to the greater finishing strain would enhance this kind of precipitation, counteracting the corresponding grain refining effects over ageing response.…”

Section: Resultssupporting

confidence: 80%

Effect of controlled-rolling parameters on the ageing response of HSLA-80 steel

Gorni¹,

Mei

2008

Journal of Materials Processing Technology

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Microalloyed steels containing copper in order to promote precipitation hardening are one of the approaches adopted to develop new materials with high mechanical strength but minimized carbon content to assure good weldability. Besides that, the thermomechanical processing of such alloys can eliminate the subsequent quench and tempering heat treatments required by conventional steels. The effects of controlled rolling parameters over the ageing response of an HSLA-80 microalloyed steel with 1.10% copper were studied in this work. The relatively weak influence over the ageing response verified when the reheating temperature was elevated from 1100°C to 1200°C indicated that copper precipitation is the main mechanism behind the hardening promoted by the ageing treatment; niobium had a secondary role. The strain degree applied during the roughing phase increased the ageing response of the alloy, but a increase in the strain degree applied during the finishing phase had no effect over this aspect. Also a finishing temperature variation did not affect significantly the ageing response of the HSLA-80 steel.

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Section: Resultssupporting

confidence: 80%

Effect of controlled-rolling parameters on the ageing response of HSLA-80 steel

Gorni¹,

Mei

2008

Journal of Materials Processing Technology

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“…For example, the chemical composition (wt%) of the Nippon steel in Japan used for the 550 MPa grade offshore structure steel is 0.09 C, 1.5 Mn, 0.2 Si, 0.2 Cu, 3.3 Ni, 0.7 Cr, 0.5 Mo, and 0.04 V, and its carbon equivalent (C eq ) is about 0.771wt% [8]. In USA, the basic composition of HY-80 ship hull steels is 0.15 C, 0.25 Mn, 0.25 Si, 1.40 Cr, 2.7 Ni, 0.4 Mo, 0.05 Cu, and 0.01 V [9][10], with the C eq of about 0.78wt%, and it can be replaced by the HSLA-80 ship hull steel, which has the basic composition of 0.07 C, 0.5 Mn, 0.4 Si, 0.75 Cr, 0.9 Ni, 0.2 Mo, 1.15 Cu, and 0.02 Nb [11][12]. Still, there are many other examples, such as the AB series steels of Russia and the HLES series steels of France.…”

Section: Introductionmentioning

confidence: 99%

Properties and homogeneity of 550-MPa grade TMCP steel for ship hull

Nie

Chen

Song

et al. 2010

Int J Miner Metall Mater

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Ultra low carbon steels by the thermal mechanical control process (TMCP) with less Ni, Cr, and Mo contents have been developed for 550 MPa grade heavy gauge ship hulls and offshore structures. The relationships among microstructures, process, and properties of the studied steel have been investigated. A series of accurate control technologies have been developed for this kind of steel. Cu microalloying and TMCP+relaxation precipitation control (RPC)+accelerated cooling process were employed to optimize the mechanical properties and ensure the homogeneity of the 80-mm thick plate. The microstructures of thin plates slightly changed from surface to center, but the microstructures of the heavy gauge plate (80 mm) changed notably. Adopting the simple composition, it can meet the requirement of thin plates by adopting a few microalloys. As for thick plates (80 mm), a little higher Cu and Ni contents should be adopted. These steels can meet the needs without tempering. By these ways, the properties of the steels can be optimized, and the cost can be decreased notably.

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“…As a fallout, a surge in appearance of research reports on the design and development of ultra high strength steels of high fabricability can be noticed in recent literatures [1,2]. Processing-structure-property co-relation of high strength lean alloy steels are studied by previous workers [3]. In view of the ability of ultra fine grained steels to achieve excellent combination of strength and toughness, there has aroused a great interest in scientific community for developing novel ultra fine structured steels [4].…”

Section: Introductionmentioning

confidence: 99%

Structural evolution in a synthetically produced ultrafine grained low carbon steel

2019

Self Cite

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In this work, low carbon of extremely fine grain structure was produced by mechanical alloying of powders of iron and activated charcoal with minor addition of copper (Cu); mechanically alloyed powder was consolidated by spark plasma sintering to obtain a high-density compact. The steel so produced was subsequently subjected to forging followed by normalizing. The characterization was carried out by means of nanoparticle size analyzer, X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy, and Vickers microhardness testing. The microhardness value obtained for the steel was found to be significantly high and comparable with that of nanocrystalline/ultrafine grained steels produced by other routes. The increased hardness resulted from the smaller grain size and presence of finely dispersed ultra small sized copper and cementite precipitates.Keywords Fine grained ultra high hardness steel · Mechanical alloying · Grain growth inhibitor · Spark plasma sintering · Precipitation · Activated charcoal Abbreviations HEBM High energy ball milling AC Activated carbon SPS

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Effect of composition and thermomechanical processing on the ageing characteristic of copper‐bearing HSLA steel

Cited by 14 publications

References 7 publications

Effect of controlled-rolling parameters on the ageing response of HSLA-80 steel

Effect of controlled-rolling parameters on the ageing response of HSLA-80 steel

Properties and homogeneity of 550-MPa grade TMCP steel for ship hull

Structural evolution in a synthetically produced ultrafine grained low carbon steel

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