Precipitation strengthening in titanium microalloyed high-strength steel plates with new generation-thermomechanical controlled processing (NG-TMCP)

Li, X.-L.; Lei, Chengshuai; Deng, Xiaomin; Wang, Z.-D.; Yu, Ying Xia; Wang, G.-D.; Misra, R.D.K.

doi:10.1016/j.jallcom.2016.08.010

Cited by 39 publications

(8 citation statements)

References 32 publications

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“…They incorporated a formula for obtaining crack susceptibility in terms of units of crack susceptibility (UCS), in function of the composition of the welded metal: This formula is valid in the following composition ranges: 0.08-0.23% C 0.010-0.050% S 0.010-0.045% P 0.15-0.65% Si 0.45-1.6 Mn 0-0.07% Nb They concluded that there is no risk of cracking in compositions above the following compositions: HSLA steels have been widely used for their excellent properties obtained through their microstructure, which is strongly altered by the selection of alloying elements and thermomechanical processes. [113]. In the year 2007, Bose-Filho et al studied the effect of Ti, Ni, Mo and Cr on the microstructural development in the welding of an HSLA steel and reported that increasing the Ti content from 50 to 400 ppm does not contribute considerably to microstructural development; however, by increasing the content of Ni, Mo and Cr to increase the hardenability, they observed a change in the microstructural morphology from a mixture of allotriomorphic ferrite, Widmanstätten ferrite, acicular ferrite and microphases to a mixture of acicular ferrite, bainite, low carbon martensite and microphases [114].…”

Section: Microalloyed Steels Weldingmentioning

confidence: 99%

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Villalobos

Del-Pozo

Campillo

et al. 2018

Metals

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Microalloyed steels have evolved in terms of their chemical composition, processing, and metallurgical characteristics since the beginning of the 20th century in the function of fabrication costs and mechanical properties required to obtain high-performance materials needed to accommodate for the growing demands of gas and hydrocarbons transport. As a result of this, microalloyed steels present a good combination of high strength and ductility obtained through the addition of microalloying elements, thermomechanical processing, and controlled cooling, processes capable of producing complex microstructures that improve the mechanical properties of steels. These controlled microstructures can be severely affected and result in catastrophic failures, due to the atomic hydrogen diffusion that occurs during the corrosion process of pipeline steel. Recently, a martensite-bainite microstructure with acicular ferrite has been chosen as a viable candidate to be used in environments with the presence of hydrogen. The aim of this review is to summarize the main changes of chemical composition, processing techniques, and the evolution of the mechanical properties throughout recent history on the use of microalloying in high strength low alloy steels, as well as the effects of hydrogen in newly created pipelines, examining the causes behind the mechanisms of hydrogen embrittlement in these steels.

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Section: Microalloyed Steels Weldingmentioning

confidence: 99%

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Villalobos

Del-Pozo

Campillo

et al. 2018

Metals

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“…Precipitation strengthening plays an important role in the design and fabrication of advanced structure materials with superior mechanical properties and strong resistance to radiation damage [1][2][3][4][5][6][7][8]. With increasing unprecedented environmental challenges, advanced ultra-high strength steels strengthened by nanoscale precipitates have been developed [9].…”

Section: Introductionmentioning

confidence: 99%

Independence of work hardening and precipitation strengthening in a nanocluster strengthened steel

Zhao

Tong

et al. 2017

Journal of Alloys and Compounds

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Work hardening and precipitation strengthening are two important strengthening methods that closely associate with dislocation density. Here, a new class of nanocluster strengthened steel with a tensile strength of ~2.02GPa and an elongation of ~7% is developed through a combination of work hardening and precipitation strengthening. The work hardening is strongly dependent on the dislocation density induced by thermomechanical treatments while there is no effect for dislocation density on precipitation strengthening. The work hardening and precipitation strengthening are independent and can be controlled separately. The strengthening effects of nanoscale precipitates are quantitatively analyzed and assessed.

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“…For example, the application of ultra-fast cooling of laboratory vacuum melted 0.15C-0.08Ti-27ppmN steels, to obtain a mixture of TiC and Fe3C in a bainitic microstructure was studied by Li et al 227 with the same aim as Fu et al .212 After roughing,one sequence consisted of rolling in the recrystallization temperature zone,1150-1096°C,further rolling in the non-recrystallization temperature zone, finishing at 864°C, then water cooling at 64°Cs -1 through the γ → α transformation region to 580°C, followed by an isothermal holding for 20 min, prior to air cooling to RT. A fully bainitic microstructure was observed in the 12mm thick plate.Besides nanoscale TiC particles,a high volume fraction of cementite, ≤ 35nm was observed,which , it was claimed made a greater contribution to σy of ~690 MPa, than the TiC particles.This is a similar conclusion to that of Mao.…”

Section: The Above Discussion Have Involved Multiple Precipitation Omentioning

confidence: 99%

Titanium microalloyed steels

Baker

2018

Ironmaking & Steelmaking

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For many years titanium has been regarded as a relative minor element in microalloyed steels compared with niobium and vanadium. However, over the past decade or so, titanium compounds in microalloyed steels have been recognized as having a wider role than just involved in austenite grain refinement.This is considered in the present review. The background and brief history are followed by sections dealing with the physical state of titanium and compounds of titanium, including borides, carbides, nitrides, oxides and sulphides characterized in MA steels. Many of the investigations on the solubility of these compounds in iron, and the precipitates they form, are considered, which leads to their functions in controlling the mechanical and toughness properties of MA steels.This now often involves the multiple alloying additions of titanium, niobium and vanadium with both carbon and nitrogen, and the morphologies of the various precipitates characterized in MA steels is presented. Titanium has become an important element in the development of line pipe steels, which for the higher grades have moved to bainite/acicular ferrite microstructures. The influence of Ti in the nucleation of acicular ferrite is an active research area, particularly with regard to the use made of titanium compounds in welding of MA steels. Finally, consideration is given to the influence of titanium on hot ductility and how titanium additions behave during continuious casting and thin slab direct charging processes.

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Precipitation strengthening in titanium microalloyed high-strength steel plates with new generation-thermomechanical controlled processing (NG-TMCP)

Cited by 39 publications

References 32 publications

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Microalloyed Steels through History until 2018: Review of Chemical Composition, Processing and Hydrogen Service

Independence of work hardening and precipitation strengthening in a nanocluster strengthened steel

Titanium microalloyed steels

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